Most popular

How to troubleshoot an automotive engine high idle?

Table of Contents

How to troubleshoot an automotive engine high idle?

The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Step 1 – If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too.

How can I keep my car at idle?

Step 3 – Engine vacuum is a sealed system and must hold a specific amount to maintain proper idle conditions, inspect the engine vacuum hoses and intake gaskets. Step 4 – The air intake boot or tube is used to deliver air to the intake system of the engine.

When to remove an idle air control valve?

Because of the nature of this valve (large air volume processed) it should be serviced when a tune up is performed to remove “coking” which will hinder the valve’s performance. To perform a rough check of the idle air control, remove the valve while reconnecting the wiring harness.

How can I check the idle air control?

To perform a rough check of the idle air control, remove the valve while reconnecting the wiring harness. While observing the valve with a flashlight, turn the key to the “ON” position, (DO NOT START ENGINE.) the valve should move slightly.

Why does my Chevy Corvette stall at idle?

Alright, when I first bought it, it had a problem with idle and it stalled a couple times. The Low Coolant Sensor was also just hanging in the engine bay. I read that it was tied to idle from 84-89 as a failsafe to prevent the car from overheating.

What’s the idle RPM on a Chevy Corvette?

On start up, the idle drops to 400/500RPM then goes up to 1200RPM, then the idle lowers to and alternates between 600 and 900 RPM. It never stays constant. Its stalling under a minute after start up, and it will stall once the idle drops if I rev it while its in P.

Can a idle air control valve be a problem?

I agree with Marv02, an Idle Air Control valve is a possibility. I would agree with Slvrvette only if the OP’s condition got progressively worse. If it just one day started running like garbage, that sounds more like a faulty component, unless of course a vac line got disconnected.

What causes a steady miss at idle and under load?

If you have an unexplained miss at idle and under load there are two possible causes that can be difficult to find in some situations. A worn camshaft will cause a steady miss. A slightly worn camshaft lobe will possibly have only a minor tapping noise occur.

Why does my Chevy 6.0 stall out at low idle?

A poor idle sometimes happens after working under the hood as guys have a tendency to lean on the air intake piping pushing it down slightly. Which causes air to leak in around the clamps.

What causes head gasket to fail on 6.0L diesel?

EGR Coolers on the 6.0L Powerstroke cool the exhaust gases before they are reintroduced the the engine. This reduces NOx emissions. As with all early emissions devices, they frequently cause problems. Higher operating temperatures are a typical symptom of a clogged EGR cooler. These higher temperatures commonly cause head gasket failures.

What are the most common problems with a 6.0L Powerstroke?

Most Common 6.0L Powerstroke Problems. 1 1. Head Gasket Failures & TTY Head Studs. The 6.0L Powerstroke came equipped with TTY, or torque to yield, head studs. If you are considering 2 2. FICM: Fuel Injection Control Module Failure. 3 3. 6.0L Powerstroke Oil Cooler Problems. 4 4. EGR Cooler Problems. 5 5. EGR Valve Problems.

The troubleshooting procedure for high and low idle conditions are similar, which are included in the following: Step 1 – If the check engine or service engine light soon has illuminated retrieving the diagnostic trouble codes could lead you in the right direction of what the problem is, or is related too.

A poor idle sometimes happens after working under the hood as guys have a tendency to lean on the air intake piping pushing it down slightly. Which causes air to leak in around the clamps.

What does accelerated idle mean on a car?

But if the accelerated idle persists even after the engine is fully warmed up, it probably indicates a genuine problem. The first step is to determine if there are any diagnostic trouble codes stored in the PCM (powertrain control module). If there are, this will give you a good starting point for troubleshooting.

To perform a rough check of the idle air control, remove the valve while reconnecting the wiring harness. While observing the valve with a flashlight, turn the key to the “ON” position, (DO NOT START ENGINE.) the valve should move slightly.

What are the symptoms of a bad idle control valve?

$0.00 1 Irregular idle speed One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. 2 Check Engine Light comes on Another symptom of a potential issue with the idle control valve is an illuminated Check Engine Light. 3 Engine stalling

Why does the Check Engine light come on when the engine is idle?

The check engine light in your vehicle is designed to turn on if the Engine Control Unit (ECU) identifies an issues with how the engine is running. Look at your dashboard; if the check engine light is on in conjunction with idle issues, it may be because the idle control valve is malfunctioning.

What causes an engine to stall at idle?

If the ISC valve is gummed up with fuel varnish or dirt, it may stick, preventing the engine from maintaining the proper idle speed when the throttle closes. A faulty idle speed control circuit may also allow the engine to stall when idling if it fails to compensate for idle loads placed on the engine by the charging system or A/C compressor.

How does the idle speed of an engine work?

The engine’s idle speed is controlled by how much air is allowed to bypass the throttle via the idle bypass circuit in the throttle body. The PCM monitors idle speed and operates a solenoid or small electric motor to move a valve that regulates airflow through the air bypass circuit.

Why is idle speed not coming back up?

If the ISC system is working correctly, the PCM should adjust idle speed to keep the engine from lugging down when the A/C compressor engages. If idle speed drops down and does not come back up, the ISC system is not responding the way it should.

What’s the idle RPM on a Silverado Silverado?

Re: high idle PLEASE HELP!!! When i pull the vac line from the booster the idle rpm stays at the 1200 I had been idling for 2 yrs. It only runs rougher but maintains 1200. When I pull the same line from the back side of the intake she revs really high. Enough to scare you so I plugged it back in really fast.

Is there an intake manifold leak at high idle?

You may have an intake manifold leak on the bottom side of the engine at the lifter galley (I base this assumption by the fact that when you spray eather into the valve cover it changes the engine speed.) Re: high idle PLEASE HELP!!! You probably have a leak like aste25 mentioned.

Can a vacuum leak cause a high idle?

A vacuum leak can cause a high idle, if it is a small enough one. You may have an intake manifold leak on the bottom side of the engine at the lifter galley (I base this assumption by the fact that when you spray eather into the valve cover it changes the engine speed.) Re: high idle PLEASE HELP!!! You probably have a leak like aste25 mentioned.

You may have an intake manifold leak on the bottom side of the engine at the lifter galley (I base this assumption by the fact that when you spray eather into the valve cover it changes the engine speed.) Re: high idle PLEASE HELP!!! You probably have a leak like aste25 mentioned.

What causes a car to have a high idle?

It’s really hard to say, but I will say that those engines are prone to intake gaskets leaking. A vacuum leak can cause a high idle, if it is a small enough one.

Re: high idle PLEASE HELP!!! When i pull the vac line from the booster the idle rpm stays at the 1200 I had been idling for 2 yrs. It only runs rougher but maintains 1200. When I pull the same line from the back side of the intake she revs really high. Enough to scare you so I plugged it back in really fast.

A vacuum leak can cause a high idle, if it is a small enough one. You may have an intake manifold leak on the bottom side of the engine at the lifter galley (I base this assumption by the fact that when you spray eather into the valve cover it changes the engine speed.) Re: high idle PLEASE HELP!!! You probably have a leak like aste25 mentioned.

Why does my Chevy 350 engine not idle?

So here’s what I figured out was happening to cause the engine to not idle properly. There is a switch in the throttle position sensor that is supposed to be triggered when the throttle lever goes to idle to tell the computer to idle.

Why is the idle speed of my car so high?

Step 2 – The idle air control motor (valve) is responsible for controlling the engine idle speed, if this part fails or becomes weak the engine idle speed could become erratic, additionally, this condition may or may not trigger the MIL (check engine, service engine soon light.)

How does idle speed work on a GMC Truck?

Scan it for codes. The control module controls idle speed with an idle air control (IAC) valve. The desired RPM is based on sensor inputs and the actual engine RPM. Four circuits are used in order to control the IAC valve, allowing a precise amount of air into the intake manifold.

Why does my Chevy Silverado stall at low idle?

I have the same problem with the stalling at a stop and low idle. It idles at around 400rpm when warm. It runs fine when cold. When I go from 15 mph to a stop it will stall about 50% of the time. The other times it will recover after the tach drops to almost “0”. I have a 2001 Sierra 1500 with the 5.3 V8.

What causes rough engine idle or TDC code?

So, should the engine misfire, rough engine idle or (TDC) code; point to an air leak in the intake manifold gasket, following the below directions. A very common cause of a leaking intake manifold is the gaskets and bolts used from the factory.

Why is my Chevy Silverado running rough at idle?

Really, your Silverado will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Silverado happens to have them, they can go bad and cause a rough idle.

So, should the engine misfire, rough engine idle or (TDC) code; point to an air leak in the intake manifold gasket, following the below directions. A very common cause of a leaking intake manifold is the gaskets and bolts used from the factory.

Is there an engine misfire code on a GM 4.8L?

Engine Misfire or Rough Engine Idle on GM 4.8L, 5.3L, 6.0L is becoming; more common and getting harder to diagnose. Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174.

What causes an Audi A4 to idle rough?

A super lean running engine will often idle rough. The fuel injection systems job is to atomize the fuel into fine mist. If a fuel injector has an issue with this process, it will either let too much or too little fuel into the combustion chamber relative to the amount of air.

Step 3 – Engine vacuum is a sealed system and must hold a specific amount to maintain proper idle conditions, inspect the engine vacuum hoses and intake gaskets. Step 4 – The air intake boot or tube is used to deliver air to the intake system of the engine.

What does it mean when your car Idles smooth?

Smooth idling indicates that your engine’s fuel and air are mixing just right. What is rough idling? If your vehicle’s idle is rough, possibly rising and falling, or having difficulty maintaining a steady rate of rotation, you may have a problem that needs fixing.

When did the Chevrolet 305 V8 engine come out?

As America faced an energy crisis and the government began to regulate a car’s emissions, General Motors made adjustments to many of their small block, V8 engines. GM introduced the Chevrolet 305 engine in 1976 to provide a smooth driving performance while allowing for lower octane fuels and lower emissions.

On start up, the idle drops to 400/500RPM then goes up to 1200RPM, then the idle lowers to and alternates between 600 and 900 RPM. It never stays constant. Its stalling under a minute after start up, and it will stall once the idle drops if I rev it while its in P.

Alright, when I first bought it, it had a problem with idle and it stalled a couple times. The Low Coolant Sensor was also just hanging in the engine bay. I read that it was tied to idle from 84-89 as a failsafe to prevent the car from overheating.

Why is the Chevy 305 a bad car?

The eight cylinder Chevrolet 305 is poorly regarded because of poor factory performance, especially when compared to Chevy’s larger 350 engine. While General Motors had to make some compromises in the initial design, the result is an engine that older car owners can tune to a “sweet spot” between horsepower and fuel efficiency.

As America faced an energy crisis and the government began to regulate a car’s emissions, General Motors made adjustments to many of their small block, V8 engines. GM introduced the Chevrolet 305 engine in 1976 to provide a smooth driving performance while allowing for lower octane fuels and lower emissions.

How can I tell if my idle control valve is working?

To check if an idle control valve is working properly, start by turning on your engine and letting it run for a minute or 2. Then, when it’s at an idling speed, take note of the RPMs in your car. Next, turn the engine off and disconnect the idle control motor under your hood.

How long should I Leave my ECM at idle?

You will want to leave your vehicle at idle for at least 10 minutes which will give your ECM enough time to “learn” any new modifications installed on your vehicle.

Because of the nature of this valve (large air volume processed) it should be serviced when a tune up is performed to remove “coking” which will hinder the valve’s performance. To perform a rough check of the idle air control, remove the valve while reconnecting the wiring harness.

Is there a problem with rough idle when warm up?

So, once there’re visible signs of rough idling, trouableshoot the problem without causing any further delay. As reported by Car From Japan experts, most Makes getting this engine rough idle after warm up are: Though the problem is not common but drivers of the Makes had their car serviced at garages for Rough Idle When Warm.

Why does my car idle when it is warm?

When the cars idle gets rough, it hard to comprehend the related causes. It is because rough idle when warm can either be caused by one faulty component or through series of problems. Hence, after knowing the ways to troubleshoot rough idle when warm problem, anyone can now keep a check on their vehicle’s status.

What does it mean when your ATV won’t idle?

When the engine idles fine but won’t rev up, it is a sign of it getting too little fuel, but it can also be because it is getting too much fuel. The ATV may run fine at low speeds, but as soon as you apply a little or a lot of throttle, the engine will bog down and turn off.

What does it mean when idle control does not increase?

If the engine idle does not increase, it means there is an issue at the idle control motor of its circuit preventing the signal from changing the idle. You can purchase a bidirectional scan tool at your local auto parts store. Make sure the wiring harness is firmly connected to the idle control motor before conducting this test.

Is the Chevy Camaro convertible a hard top car?

Each electric exterior is complemented by blade-design wheels and plenty of interior accents. Camaro Convertible offers a fully automatic soft-top that seamlessly disappears beneath the hard tonneau cover with the push of a single button — even at speeds up to 30 mph — or remotely using the key fob.

How much horsepower does a Chevy Camaro have?

1 335 horsepower and 284 lb.-ft. of torque 2 0 to 60 times of 5.2 seconds† (12) and 5.4 seconds† (14) 3 Direct Injection and Variable Valve Timing 4 Available 10-speed paddle-shift automatic transmission 5 Available on Camaro LT

What’s the minimum idle speed for a car?

Start engine. Check the RPM gauge for the proper idle speed setting (minimum air). This information can be obtained from Specifications, Tune Up Specs for any year you select. For the car we are using (1988 350 AT), the minimum air or idle speed should be a 400 RPM.

What’s the minimum idle speed for a 1988 350?

For the car we are using (1988 350 AT), the minimum air or idle speed should be a 400 RPM. I highlighted the needle on the RPM gauge as well as marked what the goal for this vehicle should be at (400 RPM). If the speed is off, there is a torx screw on the side of the throttle body on the driver’s side.

1 335 horsepower and 284 lb.-ft. of torque 2 0 to 60 times of 5.2 seconds† (12) and 5.4 seconds† (14) 3 Direct Injection and Variable Valve Timing 4 Available 10-speed paddle-shift automatic transmission 5 Available on Camaro LT

How do you set the idle speed on a Torx?

Set the idle speed to specifications, rotating the torx screw clockwise to raise RPM, and counter-clockwise to lower RPM. Once again, the desired RPM and needle were highlighted for ease of viewing.

What happens if your car overheats at idle?

Overheating an engine can cause catastrophic damage, so it’s important to avoid letting your engine get too hot. If you notice that it gets dangerously hot at idle, then you’ll want to avoid driving in stop and go conditions until you can check things out or take it to a qualified technician.

When does a shorted sensor cause an engine to stall?

A shorted sensor doesn’t always set a check engine light or MIL (malfunction indicator light). The computer is programmed to trigger a “service engine soon light” when the sensor has failed for a predetermined amount of time, say one minute, it only takes an intermittent shorting sensor one second to stop the computer system (stall engine).

What causes the idle speed to be higher than normal?

Most likely you’ll notice the idle speed is higher than normal. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates. A P0507 DTC trouble code may be caused by one or more of the following: Leaking air intake after the throttle body

When is the p0507 idle air control system higher than expected?

In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM.

What causes idle surges on a car ECM?

Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges.

Most likely you’ll notice the idle speed is higher than normal. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates. A P0507 DTC trouble code may be caused by one or more of the following: Leaking air intake after the throttle body

What causes a car to shift at high RPM?

Transmissions are programmed to increase shift firmness and the RPM at which the transmission shifts according to acceleration demands. A car that shifts very hard and at high RPM under normal driving may be experiencing a TPS failure, as may one that accelerates sluggishly and shifts low when the gas pedal is floored.

In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM.

Why is the idle on my TBI 350 so high?

Now i installed the TB back in the van and now the idle is super high , i connected my aftermarket tach and its idleing at 1700 rpm what should i check to see what the cause is?? High idle is most likely going to be a vacuum leak, whether due to something actually leaking (base gasket, hose, etc.) or a “controlled” leak a.k.a. the IAC.

Can a vacuum leak cause a fast idle?

At full temp, the IAC is closed no matter what loads are put on the engine. I’ve not found a TPS that caused a fast idle, but a flooding or rich condition, yes. The IAC is a controlled vacuum leak. It opens on startup to give you a fast idle. As the engine warms, the IAC closes.

Is the AC warm when the truck is idling?

When the truck is driving, the AC is ice cold. However, when I am idling for a couple of minutes, the AC will start to blow warmer air. Almost as if the ac is turned off and only the blower is working. Can somebody please assist? Thanks.

What happens when your a / C unit is idle?

When you are at idle, you are not producing as much pressure as when you are accelerating. So if your freon levels are low, then when you idle you very well may not get any cold air through the vent. As A/C runs like a giant circle of pressure, you need to make sure all the levels are sustained at all times.

But if the accelerated idle persists even after the engine is fully warmed up, it probably indicates a genuine problem. The first step is to determine if there are any diagnostic trouble codes stored in the PCM (powertrain control module). If there are, this will give you a good starting point for troubleshooting.

Can a bad alternator cause a bad idle speed?

A vacuum leak in any of the hoses can be the culprit—inspect them all for leaks. A bad idle-speed control unit can cause the problem; it may need to be replaced. A faulty alternator can fast idle issues; if so, replace it. For the do-it-yourself mechanic, Many high-idle problems can be identified and remedied with some patient troubleshooting.

Why does my car idle at a higher RPM than normal?

Updated January 19, 2019. If your car seems to be revved up to a higher-than-normal RPM while idling, it’s not necessarily a problem. If this problem happens while the engine is cold, it may be part of the engine’s design.

A vacuum leak in any of the hoses can be the culprit—inspect them all for leaks. A bad idle-speed control unit can cause the problem; it may need to be replaced. A faulty alternator can fast idle issues; if so, replace it. For the do-it-yourself mechanic, Many high-idle problems can be identified and remedied with some patient troubleshooting.

What to do if your car is idling too fast?

A throttle body cleaning is likely to cure the high idle speed as well. There are many possibilities when your engine is idling too fast. Here are some common ones to help guide you towards the root of the problem.

Why is my 5.3 L missing and rough idle intermittently?

5.3 L Missing and Rough Idle Intermittently I have changed Spark Plugs,Wires ,Coil Packs, and removed Fuel Injectors and soaked overnight. Engine code is a P0304. Misfire Cylinder #4. Most of the time around town is alright. When i put it on highway, it will surge like its cutting off and then pick right back up and be fine. Fuel Presure is 55 psi.

Are there any problems with the 5.3 liter Chevy engine?

By now it is very clear that the 5.3-liter engine is a highly faulted one. Below are examples of faults and problems to look out for with this engine type; This is a common 5.3 liter Chevy engine problem reoccurring mostly in cylinders 1,4,6 and 7 of General Motors 2005-2014 models of it.

Why does my 5.3 liter Vortec engine keep ticking?

Lifter replacement in the 5.3-liter Vortec is a complex process that includes removal of the engine heads. If the engine ticking occurs continually after only 2 hours at rest, this may be an indication of worn lifters.

What causes a car to idle rough at idle?

A clogged fuel filter stops the engine from receiving the right amount of fuel causing the engine to be rough idle. Fuel filters are often pretty cheap, and you can easily get the fuel filter removed and replaced from a nearby mechanic or do it yourself if you have some knowledge. 6. Dirty Air Filter

What happens to the engine when left in idling position?

When the engine is left in idling position, it maintains a steady but low rate of revolution approximately 1,000 RPM. The RPM needle stays constant, and this indicates that the vehicle’s engine is receiving the correct amount of air and fuel.

Can a Chevy C / K 1500 run at idle?

There is often a backfire or two when this happens. Pumping the gas does not help. I basically have to crawl through any intersection until it picks up a bit of speed from idle. The truck idles smoothly, and it runs fine once it’s above about 5-10mph or so. If moving at a picking up the speed.

Why is the exhaust gas recirculation valve on at idle?

The Exhaust Gas Recirculation Valve is a vital emission control device. It allows the exhaust gas to enter into the intake manifold, with the sole purpose of reducing emissions from the motor. However, this EGR valve isn’t supposed to operate during idle, at wide open throttle or before the engine is warmed up.

When to start working on idle attack and block?

Once you have 5K levels in your idle attack & block, you can start working on the next skill. Which is good, but you also want to keep getting levels on your idle attack and block. Why? Because it will reduce the cap by up to 10% per run (minimum reduction of 1%, if you train the skill).

What to do when your car is at high idle?

While observing the valve with a flashlight, turn the key to the “ON” position, (DO NOT START ENGINE.) the valve should move slightly. Step 3 – Engine vacuum is a sealed system and must hold a specific amount to maintain proper idle conditions, inspect the engine vacuum hoses and intake gaskets.

What causes the idle speed to go up or down?

The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed, or in some cases a surging idle speed that repeatedly climbs and falls. 2. Check Engine Light comes on

What’s the difference between high idle and low idle?

Step by step automotive repair guide on how to troubleshoot and fix an engine that is idling high (fast) or low (slow). (Note: The engine idle speed is controlled by the computer and is NOT adjustable.)

Why does my 1996 Express van not start?

Hoping it is not the fuel filter, car seems to run OK once it has started. took the 1996 express van back to the mechanic and we put the computer that reads codes on it. It only said egr as a code. This van starts when cold but not on the first crank, maybe the second or third and only if the engine is cold.

Why does my GM V8 engine misfire when cold?

Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174. But, as the engine warms up, the engine misfire or rough idle tends to go away; which seems confusing.

When does a van start in the Cold?

This van starts when cold but not on the first crank, maybe the second or third and only if the engine is cold. When driven it runs great no problems at all ….goes down the road very good even . But if I stop to shop and come back out it will not start till its cold again , then it will start everytime (cold).

What causes a GMC truck to have a rough idle?

Please discard PIP3232A. The following diagnosis might be helpful if the vehicle exhibits the symptom (s) described in this PI. • A cold rough idle that diminishes as the engine warms up. • Possible DTCS P0171, P0174, or P0300. • Random misfires at idle. The intake gasket seals may be leaking around the intake ports, causing a lean condition.

Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174. But, as the engine warms up, the engine misfire or rough idle tends to go away; which seems confusing.

Is there a problem with my Chevy Silverado?

Cold Hard CHEVY Start Problem Solved! Chevrolet Silverado Express Suburban Tahoe GMC – YouTube Cold Hard CHEVY Start Problem Solved! Chevrolet Silverado Express Suburban Tahoe GMC If playback doesn’t begin shortly, try restarting your device. Videos you watch may be added to the TV’s watch history and influence TV recommendations.

Why does my car idle when out of time?

An engine slightly out of time can idle roughly since the spark is not in sync with the cylinders. Too much timing advance or retardation causes serious drivability problems. Many problems may upset timing. However, the most common is an overstretched timing belt or chain, or a bad tensioner after miles of operation.

What causes a Chevy Corvette to idle roughly?

Here are the main components of the ignition system, as well as what would cause them to make your Corvette idle roughly. Spark Plugs – One of the absolute most common causes (if not the most common reason that your Corvette may be misfiring) is the spark plugs.

Why does my Chevy Cobalt have rough idle?

An internal combustion engine needs air, fuel, and spark in order to achieve ignition. When one or more of these variables is off it can lead to a rough idling condition. Most of the time the culprit is going to be the ignition system, although there are a myriad of other causes.

What are the common problems on Corvette Z06?

What are the common problems on Z06? I’ve heard few things but just want to be clear about the situation. The rear tires don’t seem to last very long. Oh, and police cars always seem to be following me everywhere I go. :eek2: :eek2: I think they just like to look at the car. I needed a new hinge on the center console.

What are the symptoms of a bad throttle temp sensor?

Symptoms of a Bad or Failing Throttle Body Temp Sensor Common signs include poor engine performance, stalling, and broken electrical connections. A common problem that car owners experience is high or low engine idle. A damaged intake gasket, cold air intake, or PCV valve can cause idle issues.

What happens when the idle air control valve ( IAC ) fails?

When the idle air control valve (IAC) fails it can cause all sorts of issues; and in some cases may even render it undrivable. Usually, a bad or failing idle air control valve (IAC); will produce a few symptoms that can alert the driver of a potential issue:

What happens if the idle valve goes bad?

A normal healthy idle air control valve (IAC) will provide smooth idling in your vehicle. But if the valve goes bad for any reason, the idling will go from smooth to rough. A rough idle will result in intense vibrations forming whenever your vehicle is stopped with the engine running.

Can a rough idle cause an engine to stall?

A rough idle will result in intense vibrations forming whenever your vehicle is stopped with the engine running. Since less air will be going into the engine during its idle state, the car will react by shaking profusely. Another more serious symptom of an issue with the (IAC) is engine stalling.

Why does my Chevy Corsica have a problem?

Take your Corsica to an authorized Chevy dealer to see if your Corsica is covered under the recall for these faulty manifolds. Listen for rattling coming from the transaxle while the car is running. This is normally the result of an improperly adjusted throttle cable, though it could also be a loose release fork.

What’s the best way to troubleshoot a Corsica?

When you do troubleshoot your Corsica, it’s also a good idea to keep things simple, as often there are several potential solutions to a problem. The best way to approach troubleshooting is to try the simplest solutions to common problems first and work your way up to the more complex solutions. Check to see if the engine stumbles on acceleration.

What to do if your Corsica engine starts leaking oil?

Check to see if the engine stumbles on acceleration. Over time, the Corsica’s fuel injection system may need to be checked and adjusted. This will need to be done by a qualified mechanic. Check for any oil spots or puddles under the Corsica. After 100,000 miles of driving, seals around your Corsica’s oil pan may begin to leak.

What causes white smoke coming from the tailpipe of a Corsica?

Check for white smoke coming out of the tailpipe when the Corsica is running. This is typically symptomatic of a blown or failing head gasket. However, late-model Corsicas have plastic intake manifolds that have a tendency to melt or fail around 100,000 miles.

What causes idle surge on a high mileage engine?

Jumpy ignition timing from a distributor problem can set off idle surge. Worn out cam chain can also cause that timing to jump on very high mileage engines. 2. Fuel. Fuel is the easiest to figure out so I am going to start with it. Typically we either don’t get enough or we get too much. Not enough is typically weak fuel pump or low fuel pressure.

What causes high hydrocarbon ( HC ) in a fuel?

What Causes High Hydrocarbon (HC)? Below are common failures which are likely to produce high Hydrocarbon HC. Hydrocarbons are basically raw fuel, otherwise known as Gasoline. High Hydrocarbon (HC) emissions are almost always a sign of poor fuel ignition.

What causes Extream high idle problem on Chevy 1500?

Two things come to mind very quickly. 1. Leaky throttle body base gasket.Very comon on this engine.I don’t know if you serviced this when you pulled the intake. 2.Misadjusted or bent throttle linkage.You don’t know what was done before you got to it.

Why does my Chevy Silverado have a rough idle?

Learn if it’s a simple fix or time to seek out a trusted technician. Not your vehicle? Why Is My Car Idling Rough? What are common reasons my Chevrolet Silverado 1500 has a rough idle?

Why does my LS Gen engine have high idle?

Once replacing that if the problem still persists you might have issues with the throttle body, I seen this before in the ls gen motor, they get “sticky” tb’s causing the high idle problem. Another thing is if you have an aftermarket tb, say from like bbk performance they need adjustments and tuning or else you’ll have similiar problems

The idle air control valve is programmed to regulate and maintain the engine idle speed at a constant rate. If the valve fails or has any issues it can cause the idle speed to be thrown off. This may result in an unusually high or low idle speed, or in some cases a surging idle speed that repeatedly climbs and falls. 2. Check Engine Light comes on

To check if an idle control valve is working properly, start by turning on your engine and letting it run for a minute or 2. Then, when it’s at an idling speed, take note of the RPMs in your car. Next, turn the engine off and disconnect the idle control motor under your hood.

What causes a car to run lean at idle?

If the root cause is an electrical problem within the idle air control valve itself, you will likely have to replace the IAC. A vacuum leak is a hole in a vehicle’s air intake system behind the mass air flow (MAF) sensor that allows unmetered air into the engine. This throws off the expected air fuel ratio and causes the vehicle to run lean.

Where is the idle control valve on a Chevy Vortec?

The idle control valve sits on the throttle body and is responsible for adjusting the amount of air that enters the engine at idle, ultimately controlling engine idle speeds. At idle, the valve blocks a small amount of air from entering the engine, keeping idle RPM’s low.

Why is my Chevy 4.3 engine still running?

Checking your vehicle’s fluid levels is always a good idea to maintain the overall longevity of the engine. Once you have ruled out all the basics, you can go back to what the Chevy 4.3 engine is known for: bad idle air control valves and throttle control switches.

The idle control valve sits on the throttle body and is responsible for adjusting the amount of air that enters the engine at idle, ultimately controlling engine idle speeds. At idle, the valve blocks a small amount of air from entering the engine, keeping idle RPM’s low.

Why does my car keep stalling at idle?

However it still appears to happen only at idle or when the throttle body is closed which may suggest the IAC as the problem. Keep the ideas coming as random is this happens, the frequency seems to be increasing, but I still can’t identify the point of failure. zacharyh687 wrote: It could also be a IAC issue or a gummed up throttle body.

What are the symptoms of a failing Vortec distributor?

Symptoms of Failing Vortec Distributor 1 Engine misfires 2 P0300 to P0306 engine codes (for misfire) 3 Engine is slow to start, or not starting 4 Poor idling, acceleration, etc. (usually caused by misfires)

When the engine is left in idling position, it maintains a steady but low rate of revolution approximately 1,000 RPM. The RPM needle stays constant, and this indicates that the vehicle’s engine is receiving the correct amount of air and fuel.

When does a car have a rough idle?

November 27, 2017. It’s easy to tell when your car has a rough idle: When you start the engine, it won’t run at a steady rate. It may almost stall, or it may run at varying RPMs without your putting your foot on the gas, or it may do both.

Can a 2000 350 idle but not rev up?

Idles just fine but wont rev up. I have a 2000 350 and it starts fine and idles ok, but ti will not rev up. When you give it throttle it sputters and will nor rev up.HELP. thanks:no::no:

What should the RPM be on an idling car?

When you start your engine, and just let it run without pressing on the accelerator or putting it into gear, that’s idling. A properly idling engine should be able to maintain a steady but low rate of revolutions, somewhere in the vicinity of 1,000 RPM.

What does it mean when your car dies at idle?

When a car dies at idle, it can be both frustrating and embarrassing for the driver. It is exasperating because vehicle stalling doesn’t come with any warning signs. You don’t get the usual “Check Engine” light on your instrument panel.

What causes a Chevy S10 engine to idle rough?

If an oxygen sensor goes bad, it can make your S10 run too lean (or rich). A super lean running engine will often idle rough. The fuel injection systems job is to atomize the fuel into fine mist.

What does low idle or fluctuating idle Ford mean?

Ford reports that the symptoms show as an idle speed that drops below the recommended speed or the vehicle exhibits a fluctuating idle. The vehicle may or may not store the following trouble codes: Ford has issued updated parts to fix the problem. Alldatadiy.com and Eautorepair.net are the two best shop manuals—period!

Why does my car rev up when idling?

If your car seems to be revved up to a higher-than-normal RPM while idling, it’s not necessarily a problem. If this problem happens while the engine is cold, it may be part of the engine’s design.

What does it mean when your engine idle does not increase?

Use the command in the scan tool to increase the engine’s idle. If the engine idle does not increase, it means there is an issue at the idle control motor of its circuit preventing the signal from changing the idle. You can purchase a bidirectional scan tool at your local auto parts store.

How can I increase idle speed in a Chrysler?

If the resistance is outside that range, the idle control motor needs to be replaced. Use a bidirectional scan tool to increase idle speed in a Chrysler. Connect a bidirectional scan tool to the same OBD port you would plug a code scanner into. Use the command in the scan tool to increase the engine’s idle.

How can I tell if my idle control motor is working?

Look for a difference in idle speed. Allow the engine to run for a minute so it settles to a consistent idle, then take note of any difference in the idle RPMs versus the idle you observed earlier. If the idle has not changed at all, it’s likely because your idle control motor has not been functioning.

What should resistance be for idle control motor?

Connect an Ohm meter to the two and measure the resistance between them. Fords are designed to operate with the resistance in the solenoid in a range between 7.0 to 13.0 ohms. If the resistance is outside that range, the idle control motor needs to be replaced.

Why does my Jeep have a high idling rate?

This could be a variety of issues causing the problem, but it often suggests a high idle speed. Some Jeep owners run into issues with high idling, which is the rate at which the engine is running when the car is one but not moving. Why Is My Jeep Idling High?

Is it normal to idle at 700 rpm?

High idling puts much more stress on your engine than standard idling, making these issues even more severe if the car is left to idle at a high rate for too long. 700 RPMs is around normal for idling, and if it is a few hundred over this number, you should address the issue right away.

Is it normal to have a rough idle?

This is definitely not a normal situation. If you are experiencing a rough idle or your RPM is running high, then there are a variety of reasons for why this could be happening. It is not always easy to diagnose the cause because there are so many factors involved here. Below are the top 5 causes that a mechanic would look for.

Why does my Silverado Sierra have high idle?

Cleaned the throttle body and went to put it back on and start it with out the intake attached to the throttle body. It idled funny so I shut it off.

Can a bad idle control valve cause stalling?

This is controlled by the engine’s computer. Sometimes parts go bad, which results in your car idling strangely or stalling. Check to see if your idle control valve is functioning properly before attempting to replace it. Look for a high engine idle. A common symptom of a faulty idle control valve can be a high idle.

Why is my idle control not working on my car?

If the idle has not changed at all, it’s likely because your idle control motor has not been functioning. If the idle control motor was working, disconnecting it should have created a difference in the engine’s idle. This test confirms there’s an issue with the idle control motor, but not what the issue may be.

What does it mean when your car engine is idling?

Intake leak When you start the engine and let it run without pressing the pedal, it is called idling. When the engine is left in idling position, it maintains a steady but low rate of revolution approximately 1,000 RPM. The RPM needle stays constant, and this indicates that the vehicle’s engine is receiving the correct amount of air and fuel.

What causes a check engine light to light up?

Misfires are often caused by a bad spark or a faulty air-fuel mixture. When your engine is misfiring, it will often also light up the check engine light and store trouble codes. Check the trouble codes with an OBD2 Scanner to easier find out which cylinder the misfire appear on.

Why is there a warning light on my diesel engine?

Some diesel-powered cars have a specific warning light for their diesel particulate filter (DPF), whereas others don’t and rely on the EML providing a warning instead. The latter is sometimes also illuminated if the car detects a fault with the differential pressure sensor, which determines how effectively the DPF is performing.

How can you tell if your car engine is idle?

You can often also feel the strange vibrations inside your car while sitting in the driver seat. However, modern cars do often have great engine mounts, and you do sometimes have to open the hood to check if the engine is vibrating or even jumping on idle.

Why is my car idling up and down?

One reason that your car’s engine could be idling up and down on its own is a dirty mass air flow sensor. The mass air flow sensor attached to your car’s engine is designed to sense the amount of air coming into the air intake and through the throttle valve of your engine.

Why does my car have a check engine light?

Sometimes having a check engine light can be a blessing because it can drastically cut down on the time spent troubleshooting engine idle or rough idle issues. If your car currently has a check engine light then I’d start with hooking up an OBDII reader to the car to get a better idea of what could be causing your rough idle issues.

What does it mean when your engine rattles when idle?

If it rattles when idle, it can mean something completely different than engine rattle while accelerating. Depending on the cause, repair costs can shoot through the roof. Read more below to find out what the problem could be. FREE towing & pick-ups! No obligation. Hassle-free! Engine Rattling when Idle? Accelerating? Here’s What That Means

Is the idle speed of a bike too high?

Caution: a “good” idle speed when half warmed up will be too high when fully warmed up, so you must accept the inevitable requirement for some “throttle nursing” until the bike is fully warm. “False Air”…wry description of extra, unwelcome air entering the carbs inappropriately.

Why is my idle on my 65 Mustang?

The owner of the 65 mustang also had a 1406, but his idle goes down after warming up, my idle doesn’t even do that. It remains high no matter way I do…. At this point in time it doesn’t hurt to give it a shot though. Make sure you do not have a busted diaphram inside the brake booster. This could cause a high idle also.

Can a GL1000 do a lazy return to idle?

The idle circuits in a GL1000 are ridiculously small, so slight problems are greatly magnified. To summarize, the solutions for a lazy / slow return to idle (or erratically high idle) are: Perfect idle circuits – usually requires a thorough carb overhaul, but this is worth trying this in situ carb cleaning method first.

Why does my car idle all the time?

If the computerized engine control system is faulty, high idling can be one symptom. A vacuum leak in any of the hoses can be the culprit—inspect them all for leaks. A bad idle-speed control unit can cause the problem; it may need to be replaced.

Why is the idle on my 350 so high?

It remains high no matter way I do…. At this point in time it doesn’t hurt to give it a shot though. Make sure you do not have a busted diaphram inside the brake booster. This could cause a high idle also. Infact, any vacuum leak could cause a high idle.

What should the rate of revolutions be on an idle engine?

When you start your engine, and just let it run without pressing on the accelerator or putting it into gear, that is idling. A properly idling engine should be able to maintain a steady but low rate of revolutions, somewhere in the vicinity of 1,000 RPM. Your tachometer needle should be steady and not jumping around.

Why is the idle on my air conditioner so low?

If the idle is low and inconsistent, it may be due to an issue with your idle control valve. Low idles could also be caused by vacuum leaks. 3 Look for signs of a vacuum leak.

How to troubleshoot a temperature gauge in a car?

Temperature gauge troubleshooting begins with isolating the problem either to the gauge, sending unit, fuse or wiring. As with any electrical troubleshooting it is best to check all wiring connections are clean, tight and free of corrosion. The following process must be preformed with the ignition key turned to the “on” position.

Can a bad throttle position sensor cause idle surging?

Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. 3) Check Engine Light

When to replace the idle speed control valve?

If the engine returns to a normal idle speed, the PCV valve should be replaced. Consult a vehicle specific service manual for location and specific testing procedures. If the vehicle is free from vacuum leaks and the PCV valve is functioning normally, the idle speed control motor or valve may be defective.

What to do if your car won’t idle?

The Fix: Set idle speed to specs. There may be some type of ignition problem. The Fix: Check and replace distributor cap, rotor, ignition wires, and spark plugs. There may be a fault in the computerized engine control system. The Fix: Bring your car to your mechanic or dealership to check the engine control system with a scan tool.

Why does my car idle at low rpm?

Incorrectly Installed or Damaged Spark Plugs (in petrol engines): Spark plugs are responsible for creating the spark that allows the vehicle to burn fuel. If spark plugs are improperly installed or malfunctioning, the idle speed can be affected. The vehicle’s engine may vibrate or there may be slipping or straining sounds coming from the engine.

What’s the idle speed on a Dodge Ram 1500?

When it’s broken, the idle speed will generally run at near 1500 RPM. 26 people found this helpful. GuruTNDKZ was right, thats what fixed my idle high problem

Really, your Silverado will be running rougher at any RPM, but a misfire will be most pronounced at idle. Spark Plug Wires – While not every model and engine combination of vehicles today comes with spark plug wires (a lot are now coil on plug), if your Silverado happens to have them, they can go bad and cause a rough idle.

When it’s broken, the idle speed will generally run at near 1500 RPM. 26 people found this helpful. GuruTNDKZ was right, thats what fixed my idle high problem

Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges.

Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. 3) Check Engine Light

What does it feel like when your car Idles?

When your car is experiencing a rough idle, your engine may chug, vibrate, or shake while it’s running. This will cause your overall driving experience to feel rough and you’ll likely be bouncing a little bit in your seat from it. When the engine idles, there will usually be a misfire that you can feel just from holding onto the steering wheel.

When your car is experiencing a rough idle, your engine may chug, vibrate, or shake while it’s running. This will cause your overall driving experience to feel rough and you’ll likely be bouncing a little bit in your seat from it. When the engine idles, there will usually be a misfire that you can feel just from holding onto the steering wheel.

Can a bad crankshaft sensor cause the engine to stall?

If the crankshaft position sensor or its wiring have any issues, it can cause the crankshaft signal to be cut off while the engine is running, which can cause the engine to stall. This is usually a symptom of a wiring problem, however a bad crankshaft position sensor can also produce this symptom.

Why does my Chevy Truck start and idle?

Not sure why this test caused a better and longer gas flow than the above test of just putting the ignition in the ON position and seeing how much gas comes out of the line before the fuel filter. Last test says to start the vehicle and remove the relay.

What kind of truck starts and then dies?

Forgot to mention this is a 1995 K1500 5.7 with TBI. When it first start if you give it some gas dose it stay runing?? My 2001 suburban did this it would start and die.

What happens to the crank sensor on a GMC?

The crankshaft sensor on GMC vehicles is synced to the powertrain control module, or PCM. When the crank sensor is replaced, it must be resynced to the PCM. Without resyncing, the PCM cannot properly determine the position of the crankshaft.

What happens if you run a car without a cooling system?

You can’t run and test an engine, other than VERY momentarily, without an intact cooling system. Overheating can warp the cylinder head and/or engine block, which can cause a failure to start due to loss of compression, valve damage and so forth.

Why is my car not starting after overheating?

If the thermostat is damaged, and left in place, that can set the stage for future cooling system problems. In your circumstance, you appear to have the additional problem that the car won’t start but that will be diagnosed and resolved after the mechanic restores the cooling system.

When does the idle air control valve change?

When the engine is running but the vehicle is not moving, this means the engine is idling. During this time, the number of revolutions per minute (RPM) inside the engine will change. The idle air control valve is responsible for managing the engine idle speed.

Why does the idle go up after cleaning the throttle body?

The idle is going to be high at first until the computer relearns the idle again. Cleaning the throttle body allowed more air to enter the engine, and the computer is compensating by adding more fuel.

When the engine is running but the vehicle is not moving, this means the engine is idling. During this time, the number of revolutions per minute (RPM) inside the engine will change. The idle air control valve is responsible for managing the engine idle speed.

What should I do if my Harley Davidson is idling?

Load test the battery too and if it is weak replace it being it idles normal once the voltage gets up there. Generally anything above 9-10 volts will run the electronics but there;’s always that exception. Thanks Glider, I’ll check all these things out. First, I’m going to find where that motor is and see if I can’t check it myself.

What causes a rough idling of an engine?

Spark Plugs. A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber.

What should I do if my car Idles rough?

Using a carburetor cleaner is a simple step to help dissolve these carbon deposits and keep them clean in order to prevent or decrease a current rough idle. An engine which is operating properly should run smooth without any excess noise. If it begins to idle ‘rough,’ there are a number of possible causes.

Why does my vacuum have a rough idle?

Leaks in these hoses and in other parts of the vacuum system can be another cause of a rough idle, often because of a lean air-fuel mixture from excess air entering the system.

Why does my car idle at a higher RPM?

This also creates a vacuum within the intake manifold. These hoses can wear out over time and a leak may develop. If too much air gets mixed in with the fuel, it will cause your engine to misfire. This will result in a rough idle, usually at a higher RPM.

Why is my Dodge Durango idling at 40 mph?

In the morning when it is cold, the RPMs go higher than normal to shift out of first. Between 35 and 40 mph, it has a slight annoying vibration. After speed is leveled off, or the cruise is set, it has a slight hesitation. It finally made the check engine light come on, but the OBD said no trouble codes present.

What’s the problem with my Dodge Durango 05?

Check the Dodge Durango: Problems & Solutions discussion for any related posts over there (try a Search This Discussion for idle). My wife’s 05 Durango surged forward at a stop sign causing a fender bender even with the brake engaged. The dealership claimed a sticking solenoid and fixed it.

What kind of engine does a Dodge Durango have?

I have a 2000 Dodge Durango with 5.2 liter engine. In the morning when it is cold, the RPMs go higher than normal to shift out of first. Between 35 and 40 mph, it has a slight annoying vibration. After speed is leveled off, or the cruise is set, it has a slight hesitation.

How is fuel injected in a diesel engine?

To control a modern diesel engine you need to control: Fuel injected quantity Fuel injection timing Fuel injection duration In order to control fuel injection you must know how much air is flowing into the engine and you must know the engine speed. So you have 5 factors very closely linked. Mass of Air Flowing (MAF) Fuel Injected quantity

How does a high idle system work on a diesel?

Let me know if it works. The diesel engine has a high idle system to improve the warm-up time of the engine in cold weather conditions. This system allows the engine control module ( ECM) to increase the idle speed above the normal calibrated value. The ECM increases the idle speed using the following adjustments:

How do you set the fast idle on?

For the variable fast idle, press and hold the accelerator at the desired RPM, then press and release the cruise control switch to set the desired idle speed. When the fast idle is active the Driver Information Center (DIC) will display “FAST IDLE ON”. Pressing the brake. Selecting the Cancel button.

How do I turn off idle up feature in Ram truck?

Turn on the cruise control. 2. Press the ‘set’ button. The RPM will then rise to 900 RPM. 3. You can then press and hold the ‘accel’ button to increase the RPM above 900RPM 4. You can press and hold the ‘decel’ button to reduce RPM back to 900 RPM. 5. To turn off the feature either: turn off cruise control, step on the brake or clutch.

How do you turn off idle up feature?

Procedure 1. Turn on the cruise control. 2. Press the ‘set’ button. The RPM will then rise to 900 RPM. 3. You can then press and hold the ‘accel’ button to increase the RPM above 900RPM 4. You can press and hold the ‘decel’ button to reduce RPM back to 900 RPM. 5. To turn off the feature either: turn off cruise control, step on the brake or clutch.

What to do if John Deere guidance system is not working?

If you have another tractor close that you know the guidance system is working on, you can temporarily remove the ISO plug from that tractor and plug it in on the tractor that is not functioning properly. If the receiver comes online, then you will need to contact your local John Deere Dealer to purchase a replacement ISO plug.

How to turn on Autotrac on a John Deere tractor?

There are a few things that your John Deere guidance system needs in place before you can engage your AutoTrac. The tractor must be clear of any active trouble codes related to the guidance system You must turn the AutoTrac system on using the steering wheel icon on your Greenstar display

Why does my fj80 have a high idle?

I had a higher idle in park or neutral (900 to 1100 RPM) that would drop to 800-900 RPM (in any gear). In other words, the two idle conditions weren’t equal. The ECU controls the idle by allowing or denying air into the intake.

If you have another tractor close that you know the guidance system is working on, you can temporarily remove the ISO plug from that tractor and plug it in on the tractor that is not functioning properly. If the receiver comes online, then you will need to contact your local John Deere Dealer to purchase a replacement ISO plug.

There are a few things that your John Deere guidance system needs in place before you can engage your AutoTrac. The tractor must be clear of any active trouble codes related to the guidance system You must turn the AutoTrac system on using the steering wheel icon on your Greenstar display

If the engine idle does not increase, it means there is an issue at the idle control motor of its circuit preventing the signal from changing the idle. You can purchase a bidirectional scan tool at your local auto parts store. Make sure the wiring harness is firmly connected to the idle control motor before conducting this test.

This is definitely not a normal situation. If you are experiencing a rough idle or your RPM is running high, then there are a variety of reasons for why this could be happening. It is not always easy to diagnose the cause because there are so many factors involved here. Below are the top 5 causes that a mechanic would look for.

Why does idle speed drop during cold startup?

If the idle air control valve did not compensate for these, the idle speed would drop when certain accessories are used. In severe cases, the engine may even stall. The idle air control valve is most important on a cold startup. Problems with the idle air control will be most obvious during this time.

Look for a difference in idle speed. Allow the engine to run for a minute so it settles to a consistent idle, then take note of any difference in the idle RPMs versus the idle you observed earlier. If the idle has not changed at all, it’s likely because your idle control motor has not been functioning.


Is the idle mixture screw on the passenger side unresponsive?

This weekend, I was once again working on a guy’s car that was suffering from eratic idle once warmed up, and the idle mixture screw on the passenger side was unresponsive. This was the 6th time this summer I had seen this problem, so I was pretty sure I knew what the issue was….

What happens when you idle the air control valve?

Normally, if you just start your car, the idle air control valve will cause the engine rpms to increase and slowly decrease. That would be a sign that your IAC is working.

Why does my car idle rough all the time?

3. Dirty Fuel Injector. Sometime dirty parts can also be the root cause of a rough idling engine. Fuel injectors disperse fuel into your vehicle’s engine at a precise angle and quantity, to ensure optimal performance. That being said, dirty fuel injectors are also a major contributor to poor gas mileage.

When you start your engine, and just let it run without pressing on the accelerator or putting it into gear, that is idling. A properly idling engine should be able to maintain a steady but low rate of revolutions, somewhere in the vicinity of 1,000 RPM. Your tachometer needle should be steady and not jumping around.

$0.00 1 Irregular idle speed One of the most common symptoms commonly associated with a problematic idle air control valve is irregular idle speed. 2 Check Engine Light comes on Another symptom of a potential issue with the idle control valve is an illuminated Check Engine Light. 3 Engine stalling

What causes the Check Engine light to turn off at idle?

At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. The check engine light will randomly turn on and off even if the car is running smoothly without any jerks and stalling.

How much does an idle control valve cost?

$92.73 – $160.32. Price range for all vehicles. Average rating from 17,525 customers who received a Change Oil and Filter. The idle control valve, also commonly referred to as the idle air control valve, is an engine management component that is found in one form or another on the majority of road going vehicles.

How to check if a module has been saved idle?

Check the syntax of the module currently open in the Editor window. If the module has not been saved IDLE will either prompt the user to save or autosave, as selected in the General tab of the Idle Settings dialog. If there is a syntax error, the approximate location is indicated in the Editor window.

Why is my idle speed control valve not working?

One common problem is a buildup of carbon or fuel varnish deposits in the idle speed control valve. The cure for this condition is to clean the valve, with some aerosol throttle cleaner or engine top cleaner. Disconnect the air intake ductwork from the throttle body.

What causes a bad idle on a Ford Zetec?

It is a 5cm rubber T-piece that connects the engine block to the EGR valve and the Pulse air system. Due to the movement of these pieces it often splits and lets out vacuum, resulting in a bad idle and or stalling. Many Agents know about this item and it is one of Ford’s best selling spares for the Zetec.

What’s the idle RPM on a Ford Focus?

With the engine warm, stationary idle (car not moving) is 700-750 rpm. If the car is in motion, the rev’s will only drop to 1500 at the lowest, until the vehicle speed is 15 mph or less, which is fine. I still have 1 problem though, and it has to do with the Air Conditioning affecting engine behavior.

What should I do if my Ford fuel injector fails?

Fuel Injector Inspection – You can take the injectors out of your Ford and inspect them for damage, dirt or rust. You can start by removing the fuel rails and detaching each injector from the rail. When you remove the injector, there will be fuel that spills out of the rail, so make sure you do not get it on you or the ground.

Why does my Dodge Charger shake at idle?

When I’m at idle for a min or so, the check engine light starts flashing. Most noticeable is the shaking/shuddering while coming to a stop. It’s the same feeling as leaving a stick shift in high gear and not pushing in the clutch while coming to a stop.

What does it mean when your car Idles rough?

My car has 128000 miles. My car has an automatic transmission. This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold that monitors the air intake as it is mixed with fuel prior to being injected into the engine.

How does the idle speed of a car work?

This valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed.

Why does my Audi A4 shake when idle?

If the vacuum system gets a leak, it will cause a shake when idle. A vacuum leak can be caused by a bad vacuum hose, intake manifold gasket, and other vacuum powered accessories. Diagnosing a vacuum leak can be tricky. Here’s a good YouTube video on how to do just that.

Why does my Chevy Captiva shake when idle?

If the vacuum system gets a leak, it will cause a shake when idle. A vacuum leak can be caused by a bad vacuum hose, intake manifold gasket, and other vacuum powered accessories. Diagnosing a vacuum leak can be tricky.

Why does my Ford F150 shake when I idle?

Here are the main components of the ignition system, as well as what would cause them to make your F150 shake when idling. Fouled plugs can cause a misfire, which in turn causes an idle shake. Spark Plugs – One of the absolute most common causes (if not the most common reason that your F150 may be shaking) is the spark plugs.

What to do about low idle and shakes?

So far I have cleaned the MAF sensor, new air filter, new plugs, wires, cap, rotor, cleaned the EGR, replaced the Ignition control and Ignition control module. I have even run GM top cleaner through it (throttle body) for Carbon build-up and got no carbon or results.

What to do if your vacuum advance malfunctions?

But when the vacuum advance malfunctions, the once-mighty muscle car develops an annoying stumble or lack of power under part throttle conditions. To avoid these types of problems, you’ll want to give your vacuum advance regular check-ups to make sure it’s in working order.

What causes idle problems in a Ford Mustang?

In this age of fuel injection, idle problems can literally be caused by hundreds of different things. What this series of articles is aimed at is how to fix the most common idle problems found in the Mustang. The fuel injected Mustang uses a small motor/valve assembly that allows a specific amount of air to enter the engine to control it’s idle.

Why is my IAC valve not working on my Mustang?

The problem arises when the car gets some miles on it (usually 75K+) and carbon fouling takes its toll. What happens is dirt, excess air filter oil, and most notably carbon gunks up the IAC valve and doesn’t allow it to either open or close properly.

How does the fuel injected Mustang engine work?

The fuel injected Mustang uses a small motor/valve assembly that allows a specific amount of air to enter the engine to control it’s idle. This valve is comonly called the idle motor, the IAC (idle air control) or the IAB (Idle air bypass). When your car is new the IAC works remarkably well.

How do you put the IAC back together on a Mustang?

Putting it back together: Yet another self explanatory step. Put the IAC in place and install/tighten the 8mm bolts. Make sure you don’t forget to reinstall the gasket. 6. Fire her up! Finally you need to start the car and let it run for a few minutes to burn any leftover carb cleaner in the intake.

What causes a car to idle at 1500 rpm?

The idle control circuit is very common to have problems. Pull the ecu and check the board for damage. Vacuum leaks, TPS settings, BISS settings, throttle cable adjustment, stop screw adjustment. All of these have cause idle issues on my car at one point or another.

How to perform Ford idle relearn you MPT performance?

Turn the air conditioning on and allow the engine to idle for at least one minute. Release the parking brake. With your foot on the brake pedal and the A/C still on, put the vehicle in “D” (Drive) and allow the engine to idle for at least one minute. Drive the vehicle to complete the relearning process.

Why do I have an erratic idle after loading a tune?

In the event you are experiencing an erratic idle after loading a tune or after performing any action that clears KAM (Keep Alive Memory), an Idle Relearn can help you get back on track. The KAM or “Keep Alive Memory” is the memory that is stored in the powertrain control module (PCM).

Where is the trouble code on an Oldsmobile?

When retrieving Oldsmobile trouble codes with an OBD II scan tool, proceed as follows: 1. Connect scan tool to the 16-pin data link connector (DLC) located underneath the steering column. The connector may have a removable cover. 2. Turn the ignition on. 3.

Why does my car idle at 500 Revs?

The engine might idle at, say, 800 revs, but drop to 500 when the headlights are switched on. This would be a classic example of a seized idle speed control and most times the engine would stall until warmed up. In such a case, clean the throttle body. If this does not cure the trouble, clean the idle control valve.

Why does my car stall at the idle speed?

Because tolerances are tight, a bit of dirt can stop the cylinder rotating resulting in stalling and fast idling. Be extra careful when changing the air filter. Idle speed may be affected by electrical loading.

What’s the RPM on a 2002 Ford F-150?

Ok once in a while when I turn on my 2002 Ford F-150 the RPM’s go from 1000 to 800 then back to 1000 over and over and this is at idle. I haven’t gone to get it looked at and I want to see if it’s something I can fix at home.

Why does my Ford Focus have high revs?

Ford focus DTC codes. Ford= First on race day. Charging at 15v is a bit high and may be caused by the regulator in the alternator being faulty . Better to replace alternator if that is fault rather than strip down and overhaul .Could also indicate a battery with weak cells and alternator trying to compensate for low battery .

What causes high revs when idle in Subaru?

Subaru/Ford guy. Disconnect the EGR valve, if it gets better, then that was the problem. But it might not be either of what me and LOGAN are saying, it might be a TB problem, or Air idle control valve. But try this stuff and get back to us. Could also check wiring / harness / connector to TPS for water or dampness ingress.

When do the Revs go up when idle?

I’ve had this problem for 2 years now, every winter it’s the same thing, whenever the car is running and i press the clutch, the revs go up to 2000 and stay there until the car comes to a complete halt, at which point, it drops down to normal 1000.

Why does my Ford Focus run at idle?

When a Ford Focus exhibits problems with running roughly at idle speeds, auto mechanics generally look first to either a vacuum problem, or more often, a problem with water getting into the Differential Pressure Feedback Sensor (DPFE), a part of the EGR (exhaust gas recirculation system).

Why does my Ford Focus fail emissions test?

If you live in a state with vehicle emissions testing, this may be the reason why your car fails the test. With the Ford Focus in particular, the problem may be caused by water getting into the DPFE sensor, interfering with its ability to accurately gauge pressure changes in the EGR system.

How big is the solenoid on a Ford Focus?

Cut vertically upward from the bottom along each of the two vertical lines, stopping at the line drawn horizontally. Fold the section of insulation upward. With the insulation held up, reinstall the EVR solenoid. Tighten to 36 +/- 6 lb.-in. (4.1 +/- 0.7 N.m)

How does the EGR system in a Ford Focus work?

The system works by recirculating exhaust gases back into the engine in order to lower cylinder temperatures and emissions. The EGR system has several components that work together to do this. One of these components EGR’s differential pressure feedback sensor, commonly known as the DPFE.

Why does my Ford F-150 idle really high?

4 people found this helpful. Lower intake manifold vacuum leak will make it idle really high , especially at startup. 2 people found this helpful. Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus.

How often does engine RPM drop when idle?

The engine stays idling at about 1000 RPM. However every now and then it drops down to about 500 RPM and then quickly back up to about 1200 then goes slowly down to 1000 and stays there for a bit until I go again or it drops again. It only happens for a second or two and about 3 times a minute.

What should the idle speed be on a motorcycle?

And you will usually not be able to adjust the idle level in any way. Usually we see the idle speed being between 1000 and 1300 RPM (engine revolutions per minute) when the engine is at operating temperature, and often as bit higher during warm up.

Why is the idle speed too high on my Wrangler?

The usual cause of abnormally high idle speeds are vacuum leaks or an inoperative idle speed control motor. A vacuum leak on a fuel injected engine will cause high idle. The oxygen sensor will detect the extra oxygen that is entering the engine through the vacuum leak and will signal the computer the exhaust is lean.

Why does my car idle at 700 rpm?

There is an air filter which prevents debris from the air from getting into the chamber. But if this air filter is dirty or clogged, then there will be less clean air passing through it. This will cause the engine to idle rough. Your engine should normally get to around 700 RPM after you start the vehicle.

And you will usually not be able to adjust the idle level in any way. Usually we see the idle speed being between 1000 and 1300 RPM (engine revolutions per minute) when the engine is at operating temperature, and often as bit higher during warm up.

If the idle air control valve did not compensate for these, the idle speed would drop when certain accessories are used. In severe cases, the engine may even stall. The idle air control valve is most important on a cold startup. Problems with the idle air control will be most obvious during this time.

What should the idle RPM be on a Mustang?

I found that under 1000 rpm the idle would surge wildly so I unscrewed one of the idle plates screws to raise the rpm. I cannot adjust the idle to lower than 1100 or so or the engine will surge. The surging is especially bad when the system is just at battery voltage under 1000 rpm.

What causes an engine to surge at idle?

A surge is usually caused by a fuel system management or drivetrain operation failure. When an engine’s computer can “hunt” or “surge” at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system. SPONSORED LINKS. Article published 2017-01-26.

I found that under 1000 rpm the idle would surge wildly so I unscrewed one of the idle plates screws to raise the rpm. I cannot adjust the idle to lower than 1100 or so or the engine will surge. The surging is especially bad when the system is just at battery voltage under 1000 rpm.

What is an example of a high idle?

Example: You pull up in the driveway or to a stop light with the clutch in and the car idles it self up to 2K or 3K rpms and then stays there, then finaly drops down when it wants to. Or, your driving down the road, push the clutch in, and the car stays at whatever rpm you were at when you went to make the shift for more than a sec or two.

What causes an engine to vibrate at rough idle?

It only takes a minor problem like a fouled spark plug to cause your engine to vibrate. Idle problems may originate in a worn out component, a failed part, or a blown gasket. The number of potential sources of a rough idle can make your diagnostic a little difficult.

When the valve fails, it may get stuck close or open, or even leak. It is when the valve remains open when engine idle suffers. Sometimes, the engine may stall at idle because of the lean of the air-fuel mixture.

Why does my Ford Escape have a rough idle?

What are common reasons my Ford Escape has a rough idle? While there are a variety of reasons your Ford Escape has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. See what others are asking about their Ford Escape.

What to do if your car engine has rough idle?

If you own an old car and are experiencing rough idling, it is a good idea to clean the carburetor and check the hoses for damage or dirt buildup. Rough idling is a serious issue and should not be ignored for a long time. If the problem persists and is not fixed, it can lead to engine failure as well.

Why does my Ford F-150 run at high idle RPMs?

High idle rpms please help!!! screw and got it down to about 1,100 rpm. I unplugged the IAC and the truck runs when i let go of the gas pedal the rpms are still up and the truck goes by itself. doesn’t seem to be any vacuum hoes leaks.

Why does my car feel rough when the engine is idle?

This will cause your overall driving experience to feel rough and you’ll likely be bouncing a little bit in your seat from it. When the engine idles, there will usually be a misfire that you can feel just from holding onto the steering wheel. Furthermore, the RPM of your engine will be higher than normal when the vehicle is idle.

If your car seems to be revved up to a higher-than-normal RPM while idling, it’s not necessarily a problem. If this problem happens while the engine is cold, it may be part of the engine’s design.

Why does the temp rise when the engine is idle?

Start the engine and let idle while at the same time watching the temp gauge. As the temp gauge rises, check to see if the radiator fan engages. If it doesn’t, there’a a problem in the fan circuit.

Symptoms of a Bad or Failing Throttle Body Temp Sensor Common signs include poor engine performance, stalling, and broken electrical connections. A common problem that car owners experience is high or low engine idle. A damaged intake gasket, cold air intake, or PCV valve can cause idle issues.

Start the engine and let idle while at the same time watching the temp gauge. As the temp gauge rises, check to see if the radiator fan engages. If it doesn’t, there’a a problem in the fan circuit.

Why does my car overheat when I idle?

But that may not be what’s causing the overheating when stopped. The problem might with the radiator cooling fan failing to come on. Start the engine and let idle while at the same time watching the temp gauge. As the temp gauge rises, check to see if the radiator fan engages.

What causes an uneven idle on an F-150?

A uneven idle on a F-150 can be a symptom of a variety of engine issues such as vacuum leaks, failed or dirty sensors or worn engine components. If the engine is older or has higher miles on it, the typical culprits will be dirty sensors and carbon deposits on engine head components.

Why does my Ford Explorer XLT not idle?

out of the blue my 2001 ford explorer xlt will not idle. It stars up fine but cuts out as soon as I take my foot off the gas. Any suggestions where to start? There might be a problem in the Idle Air Control circuit. The throttle body has mounted on it a component called the Idle Air Control motor.

How long should a diesel engine idle before running?

Most manufactures recommend idles for 3 minutes before running the engine under a load. Always look at your operator’s manual to see the exact specification for your engine. This is a common misconception. Modern diesel engines do not require the amount of time to warm up as in years past.

Why does my car idle at 1500 revolutions per minute?

Older cars will try to compensate for worn spark plugs or a failing ignition coil by increasing the engine idle. An engine with a problem that is idling at 1500 revolutions per minute is far more likely to stay running than the same engine trying to idle at 800 RPM.

What’s the idle speed of a Nissan truck?

Most of them operate in a similar manner and regulate the engine’s idle speed using the same systems, so this information is useful for many car owners. I have a 1997 Nissan Hardbody with a 2.4-liter engine, manual transmission, A/C, and 89,000 miles. It idles at 1,500 rpm, which doesn’t go down after it’s warm.

Why does my car idle at high idle?

If this tube becomes loose or broken it can leak un-metered air into the engine effectively causing an unbalance (via the mass air flow MAF sensor) in the computer system which can produce fast or slow idle.

What’s the normal idle RPM for a car?

What you want to do is find out where the car should be idling when it is completely warmed up. These days the normal range tends to be anywhere between about 650-900 rpm. 1000 is on the high side, and 1700 is certainly on the high side for cold start up. So if there is a problem it isn’t that car idles higher at start up – its supposed to.

Most of them operate in a similar manner and regulate the engine’s idle speed using the same systems, so this information is useful for many car owners. I have a 1997 Nissan Hardbody with a 2.4-liter engine, manual transmission, A/C, and 89,000 miles. It idles at 1,500 rpm, which doesn’t go down after it’s warm.

How do you fix a high idle on a Nissan truck?

If necessary, adjust the fast idle cam screw (A) until the alignment mark is centered on the lever roller. Start the engine and let it warm to operating temperature, or do the repair after a few errands that you needed to run anyway. Measure the clearance between the lever roller and the top of the fast idle cam using a feeler gauge.

What are the symptoms of a bad idle air control valve?

Below are the top 5 symptoms of a bad idle air control valve which you will easily notice. Since the idle air control valve is supposed to manage the idle speed of the engine, a bad valve will certainly throw that out of whack. It will cause the idle speed to randomly fluctuate to different speeds rather than stay at one constant speed.

How much does an idle air control valve cost?

That means you’ll need to pay both parts and labor costs. The average replacement cost of an idle air control valve is between $120 and $500. The parts could cost anywhere from $45 to more than $400, while the labor is only around $70. Of course, the labor cost really depends on the hourly rate of the mechanic.

The check engine light in your vehicle is designed to turn on if the Engine Control Unit (ECU) identifies an issues with how the engine is running. Look at your dashboard; if the check engine light is on in conjunction with idle issues, it may be because the idle control valve is malfunctioning.

When to replace idle control motor in Ford?

Fords are designed to operate with the resistance in the solenoid in a range between 7.0 to 13.0 ohms. If the resistance is outside that range, the idle control motor needs to be replaced.

What should I do if my idle control motor is disconnected?

The engine should still start and run without any issue despite the idle control motor being disconnected. Be sure to tuck the wiring you disconnected up in the engine bay so it doesn’t get caught in any moving parts. Look for a difference in idle speed.

What causes a 5.4 Triton engine to start?

As noted above, rattles, strange sounds, and a rough engine start are the most common symptoms for timing chain, tensioner, or cam phaser problems. Blowing spark plugs with the engine running isn’t exactly what you would expect to happen often. Regardless, exactly this happened to some 5.4 Triton engines right from the start in 1997.

When to start a 2000 Ford Superduty diesel?

It should ramp up from 14 to 20, 25, 30, 32 etc… and level out around <35 psi in order to start. If it ramps up to 65, 75, 85 etc, there is another issue at hand. Watch your ICP/IPR while idling.

The engine should still start and run without any issue despite the idle control motor being disconnected. Be sure to tuck the wiring you disconnected up in the engine bay so it doesn’t get caught in any moving parts. Look for a difference in idle speed.

As noted above, rattles, strange sounds, and a rough engine start are the most common symptoms for timing chain, tensioner, or cam phaser problems. Blowing spark plugs with the engine running isn’t exactly what you would expect to happen often. Regardless, exactly this happened to some 5.4 Triton engines right from the start in 1997.

What does it mean when your engine idle is too low?

If your idle is too low, it could be the IAC not talking to the computer correctly. Disconnect the IAC connector for a couple seconds while your engine is idling. If your engine idle didn’t change, you can suspect it to be the IAC. If it is working properly, unplugging it would cause your idle to freak out.

It should ramp up from 14 to 20, 25, 30, 32 etc… and level out around <35 psi in order to start. If it ramps up to 65, 75, 85 etc, there is another issue at hand. Watch your ICP/IPR while idling.

Why does my Ford 89 F150 stall at idle?

The idle was still solid, but it was running rich and >cutting out. >Valve not closing properly) popped up during the KOER test. I replaced >the EGR Valve and it seems to be running much smoother. But, I haven’t >had the opportunity to get it over 45 yet. One good thing is that the >acceleration. It’s not gone, but it is MUCH better.

What causes a car to stall at idle?

The way diesel engines produce power is different from gasoline engines. Every time the injectors push fuel and air into the chamber, the spark plugs deliver the electrical current. This keeps the engine running. If you have a weak or poor quality spark plug, then it is possible that it will lead to car stalling.

Below are the top 5 symptoms of a bad idle air control valve which you will easily notice. Since the idle air control valve is supposed to manage the idle speed of the engine, a bad valve will certainly throw that out of whack. It will cause the idle speed to randomly fluctuate to different speeds rather than stay at one constant speed.

Why does the AC blow warm at idle?

Since the AC compressor is driven by the engine, it doesn’t pump as much refrigerant when you’re at a stop or driving slowly. If the system is low on refrigerant, it will show up as AC blows warm at idle and blows colder when the engine is running at higher RPMs. Get your system refrigerant level checked.

What causes a car to run really hot?

This type of thing usually begins after I come to a stop, then when I accelerate, the fan starts reving high (faster i go, faster fan runs). The first time it happens, car runs really hot to the point my temp light comes on and temp gauge is all the way at the top (in the red)for about 5 seconds.

If the resistance is outside that range, the idle control motor needs to be replaced. Use a bidirectional scan tool to increase idle speed in a Chrysler. Connect a bidirectional scan tool to the same OBD port you would plug a code scanner into. Use the command in the scan tool to increase the engine’s idle.

What should I do if my engine idles at 500 rpm?

Put in some better fuel (Shell or Mobil premium) and just DRIVE it. Very little extra cost to you and it cleans as you drive. Your truck will thank you! Generally speaking these injected computer controlled engines have pretty low ldle speeds.

What’s the idle speed of a Chevy truck?

Thanks. Last edited by EKinMN on Nov 11 2011, 2:54am, edited 1 time in total. Most trucks start up at about 1000 RPM, and then drop down when it warms up. Although mine is a lot different than yours, I can tell you it will idle down to about 500 RPM when warm.

Is it normal to drive a Silverado at 500 rpm?

So I get into my truck this morning 2010 Silverado 5.3L and the rpm gauge reads 500 rpm. Is this normal? I seem to remember that it would idol at 1000 rpm but I can’t remember.

What should I do if my truck won’t start?

Re-attempt to start the truck. Turn the ignition on and note if the service engine soon (or check engine) light comes on. If it does, this is a good sign that the computer is receiving power and is functional. If it does not, then you must proceed to check power and ground at the computer. This is beyond the scope of this article.

What should I do if my diesel engine won’t start?

This 6.5 No-Start Diagnostic Guide is intended to be used by those with basic mechanical skills and common sense.If you lack either, then please leave the process to those so equipped. Always wear safety glasses and keep clear of rotating components when cranking or starting a diesel engine.

What does it mean when your truck won’t start?

So your truck won’t start because it doesn’t have enough power to fully energize the electromagnet inside the starter solenoid. The magnetic field keeps on failing, so the solenoid spring keeps on snapping back. That’s what is making the click-click-click noise you hear.

Why is my IAC running at high idle?

IAC Motor Malfunction. The IAC motor itself may not be working properly. A short circuit in the motor can trigger high idle problems. Sometimes IAC motors develop high resistance in the circuitry, which slows the reactions of the IAC and can lead to idling problems.

What happens if the idle level is too low?

Idle level too low. If the idle level on your (warmed up) engine is lower than the level decided by the manufactorer, you will usually have two problems: – The oil pressure inside the engine will be very low, and you may see the oil pressure lamp flicker. – Charcoal cannister in the tank ventilation line clogged by fuel or dirt.

What causes an engine to backfire at high idle?

If a main vacuum hose such as the power brake booster feed line has broken or failing off it will cause a lean backfire due to the additional air allowed into the engine intake manifold. This problem will be accompanied by high or low engine idle and a harder to push brake pedal than normal.

What would cause high rpm at idle?

Reasons for a Rough Idle or High RPM Bad Spark Plugs. If you have bad spark plugs because they’re worn out or damaged, then it could be causing your engine to be idling rough. Bad Ignition Coils/Wires. If your ignition coils or spark plug wires have gone bad, you will experience similar symptoms to having bad spark plugs. Vacuum Leak. Carburetor Issues. Dirty Fuel Injector.

Why does your car idle very high?

Sometimes the power circuit malfunctions, and it is responsible for high idling. Perhaps there is a fault in the cooling system which makes the engine overheat. The fuel pressure regulator can be a reason that either needs a repair or replacement.

What causes my idle to jump high at startup?

Possible Causes of High Idle Speed In vehicles that have carburetors, a bad accelerator pump or power circuit may be to blame. The engine may be overheating, and the cooling system might need repair. The fuel pressure regulator may be operating at too low of a pressure and might need to be replaced. The Ignition timing might be in need of adjusting.

Why does my Ford F250 stall when driving down the road?

If this occurs in exactly the same place every time, it could be caused by radio interference. There are a number of other possible causes. Checking the easiest first, make sure the fuel filter is clear and unobstructed. check for any loose wires on the coils or any loose wires anywhere.If these prove negative, we will have to look further.

Why does my Ford F250 surge at idle?

F250: 7.3L..surges..run at 50-55 when pulling an empty stock trailer. Vocational, Technical or Tra… Its probably a vacuum leak in the upper intake plenum gasket near the center. These engines had issues with the intake plenum gasket sucking in and causing a surge at idle and possibly highway speeds. … read more

What’s the idle speed on a 1996 Ford truck?

When I tap the gas, 8 seconds, then eases down to normal idle of 700-800. Dang, I don’t remember it doing that. Played and played until it was at full operating temp, and it *still* does this.

Is there a problem with my 1996 F-150?

Also watch a bolt hole the first go-arond. Start it up, and see what happens. Starts ok (still seemed to have that wide open throttle. Oh well, will deal with later. Engine running, check for leaks, nope, all looks good. On fast idle, thats Ok. Few seconds, and good, I hear it ease on down to normal idle. Playing some seeming “new” problem.

Why is my diesel engine stalling while running?

Next step would be an air test, don’t forget to command the IPR closed or turn it off with Bat+ for short periods of time. My bet is on a failing HPOP, but a short in the ICP sensor or wiring can also make it stall/shutdown while running.

Is it possible to find a misfire in a Ford?

It’s possible to find a misfire in your Ford, even if there is no check engine light. All you need is an OBDII scanner with Mode 6 function. It is a common situation. You’re driving your F150, F250, E150 van, or Expedition, etc and you can feel the engine skipping here and there.

It’s possible to find a misfire in your Ford, even if there is no check engine light. All you need is an OBDII scanner with Mode 6 function. It is a common situation. You’re driving your F150, F250, E150 van, or Expedition, etc and you can feel the engine skipping here and there.

At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. The check engine light will randomly turn on and off even if the car is running smoothly without any jerks and stalling.

What causes a no start on a 6.0L diesel?

Rough start, no start, and rough running conditions often occur due to the FICM, or Fuel Injection Control Module. The FICM supplies 48 volts to the two solenoids that control oil flow to the fuel injector. Excessive heat from the engine and vibration can cause the FICM to overheat or fail.

Rough start, no start, and rough running conditions often occur due to the FICM, or Fuel Injection Control Module. The FICM supplies 48 volts to the two solenoids that control oil flow to the fuel injector. Excessive heat from the engine and vibration can cause the FICM to overheat or fail.

Why does my diesel engine surge every other day?

I have had this problem for over 2 years now. what started back then as a once in a blue moon thing, has turned into an almost every other day occurrence. The best way I can describe what’s happening is it feels like a misfire (I know diesels don’t really misfire per se) and the engine surges.

Where is the FICM located on a 6.0L diesel engine?

Excessive heat from the engine and vibration can cause the FICM to overheat or fail. This occurs because the FICM is located on the side valve cover of the Powerstroke engine. Cold starts impact the FICM negatively by causing excess voltage to be drawn. This can damage the capacitors in the fuel injection control module.

Why does my Ford Ranger have a high idle?

Question My 1994 ford ranger high idles mostly between changing gears and acts like I have cruise control witch I don’t have and when I come to a complete stop the idle comes down. I also have a bad smell of gas all the time.

Why does my Ford Mustang idle at 800 rpm?

The car had underdrives on the crank and waterpump before I bought it and the volt gauge does not go up until about 1000 rpm. Even with this the car would idle before at 800 rpm. When I added the parts in the sig, the engine would not idle at all. The car died every time it came to a stop.

Why does my Ford Ranger Idle higher than normal?

The engine may have a higher that normal idle at times. After cold start with an automatic transmission and when the clutch is depressed with a manual transmission. Our technicians tell us updated powertrain control module (PCM) software is available to address this concern.

What causes high idle speed on Ford F-150?

Hi Everyone: Today we have this F-150 with a high idle concern that has been to a local Ford Dealership 3 times and the customer still has the same problem. During the diagnostic procedure I found the throttle plate is sticking and there is a huge gap on the spring side of the throttle plate causing the idle concern.

The car had underdrives on the crank and waterpump before I bought it and the volt gauge does not go up until about 1000 rpm. Even with this the car would idle before at 800 rpm. When I added the parts in the sig, the engine would not idle at all. The car died every time it came to a stop.

Question My 1994 ford ranger high idles mostly between changing gears and acts like I have cruise control witch I don’t have and when I come to a complete stop the idle comes down. I also have a bad smell of gas all the time.

What’s the idle rate on a 96 Ford Ranger?

96 Ford Ranger 6cyl 3.0 w/ 117,000 miles. Started to idle high at 2000 to 3000. Sometimes it comes down to normal, sometimes not. Noticed I could literary take my foot of the gas pedal when doing 40 or 50 and it would not slow down.

Why does my Ford Ranger run at high RPM?

New throttle body. Engine infrequently races in idle, sometimes up to 3,000 rpm. So many Ford Ranger owners complain of this exact issue, Ford should have done a recall repair for the problem. Instead, every Ford mechanic I’ve talked to (several) seems clueless as if it’s a rare isolated issue.

Is there a problem with my Ford Ranger?

Iv got 98 4 cly 5 speed and it idles high air idle was replaced there doesn’t seem to be vac leak iv thought about it being the speed sencer or tps is there any hope or should I take it out back and do her ol yealler style 2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k . (6/5,2014) (SOLD).

How much does a Ford Ranger engine cost?

The average cost for a Ford Ranger General Diagnosis is between $88 -$111. Learn More I can’t get my engine to idle down. I have replaced the IAC valve but that did not solve my problem.

What’s the idle time on a 1996 F-150?

Playing some seeming “new” problem. When I tap the gas, 8 seconds, then eases down to normal idle of 700-800. Dang, I don’t remember it doing that.

What are the symptoms of a Ford Explorer overheating?

Your Explorer will be equipped with a temperature warning light and/or a temperature gauge. The most common symptom of overheating is the temperature light coming on. If this light does come on, make sure that you get off the road quickly and safely. Driving while overheating can cause long term engine damage. 2. White Smoke

What’s the average rpm of a Ford Explorer?

I have a 2003 Ford Explorer that hasn’t been idling well lately. It normally idles around 800 or 900 rpms, but lately it will slow down to 400 or 500, then burst up to 1100 and repeat the process again. It doesn’t do this all the time, maybe only half-time.

How does the cooling system work on a Ford Explorer?

Your Explorer’s cooling system works by cycling the engine coolant from the engine through the radiator. The water pump pushes the water through the entire system. The thermostat opens up once the engine reaches operating temperature and allows coolant in. If any part of this system fails, your Explorer will eventually overheat.

I have a 2003 Ford Explorer that hasn’t been idling well lately. It normally idles around 800 or 900 rpms, but lately it will slow down to 400 or 500, then burst up to 1100 and repeat the process again. It doesn’t do this all the time, maybe only half-time.

When to idle air control at 1000 rpm?

Idle air control..it should idle at 1000 rpm’s when the engine rpm’s jump up and down,suspect the iac. Thanks for contributing an answer to Motor Vehicle Maintenance & Repair Stack Exchange!

Why are my RPMs so low while idling?

Typically air leaks result in poor mileage. Thanks Nick, you nailed it. After a good cleaning with throttle body cleaner the fluctuations stopped, but the RPMs were still low. I finally replaced it (Ford calls it the IAC valve, stands for idle air control valve) and it’s been running like a champ ever since.

What happens when the idle control motor is disconnected?

With the Idle Control Motor disconnected, get back into the vehicle and start the engine again. The engine should still start and run without any issue despite the idle control motor being disconnected. Be sure to tuck the wiring you disconnected up in the engine bay so it doesn’t get caught in any moving parts.

With the Idle Control Motor disconnected, get back into the vehicle and start the engine again. The engine should still start and run without any issue despite the idle control motor being disconnected. Be sure to tuck the wiring you disconnected up in the engine bay so it doesn’t get caught in any moving parts.

The engine stays idling at about 1000 RPM. However every now and then it drops down to about 500 RPM and then quickly back up to about 1200 then goes slowly down to 1000 and stays there for a bit until I go again or it drops again. It only happens for a second or two and about 3 times a minute.

What happens when the Idle is high on a Harley Davidson?

Strange that there are no historical codes since you did say you saw the check engine light come on. (Could be you went through 50 key cycles with no engine issues) When you get off the interstate & the idle is high,,, if you were to power it off and restart the bike, does the idle calm down or does it resume the high idle.

Why is the RPM on my Harley Davidson so high?

(Could be you went through 50 key cycles with no engine issues) When you get off the interstate & the idle is high,,, if you were to power it off and restart the bike, does the idle calm down or does it resume the high idle. Would help to know how high the RPM was, but you have no tach. (?)

What causes a car to run at a rough idle?

A PCV valve leak can cause the air-fuel mixture to run too lean, and this will cause a rough idle. Proper periodic servicing of the PCV valve will prevent this situation from occurring.

Leaks in these hoses and in other parts of the vacuum system can be another cause of a rough idle, often because of a lean air-fuel mixture from excess air entering the system.

A PCV valve leak can cause the air-fuel mixture to run too lean, and this will cause a rough idle. Proper periodic servicing of the PCV valve will prevent this situation from occurring.

What does it mean when your car idles for a long time?

The idle of a car engine is kind of like a human heartbeat: You can tell what shape it’s in just by listening. Problems with idle speed —things like slow idle, fast idle, rough idle, or stalling after idling for a few seconds—are symptoms that something is wrong with your engine.

What kind of car starts easy but won’t idle?

THE FUEL INJECTORS WERE TAKEN OUT & CLEANED. NOW THE CAR STARTS EASILY, BUT WON’T IDLE. CAR ACCELERATES SMOOTHLY. THANKS FOR ANY HELP ! 1986 OLDS.

Why do we have so much idle time?

As we mentioned earlier, workflow and process inefficiencies are a common cause of idle time. This is why every organization should work on spotting and eliminating bottlenecks and other issues caused by those inefficiencies. The first step in solving any problem is realizing you have one.

How much idle time is there in an 8 hour shift?

For example, in an 8-hour shift, an employee might track 7 hours and 20 minutes of productive work. This suggests that they had 40 minutes of idle time, assuming they accurately tracked everything on a time basis.

Hi Everyone: Today we have this F-150 with a high idle concern that has been to a local Ford Dealership 3 times and the customer still has the same problem. During the diagnostic procedure I found the throttle plate is sticking and there is a huge gap on the spring side of the throttle plate causing the idle concern.

Is there a high idle mod for a Ford truck?

Fortunately, the High Idle Modification is a fairly simple one, with Ford Truck Enthusiasts forum member “ Ryaneverk2 ” detailing the project for a fellow forum member, and many others have made use of his information since that initial post.

What’s the idle RPM on a Ford truck?

That one will vary the idle from 1200-2400 depending on current draw, in order to keep the battery charged properly. Some have noticed that their RPMs will creep up and up all the way to 2400, slowly, even when the current draw is staying steady.

What kind of idle control does a Ford Super Duty have?

Any help?” Fortunately, the Stationary Elevated Idle Control (SEIC) system has been built-in to 2005-and-newer Ford Super Duty pickups with a PowerStroke diesel engine, making the modification as simple as some wiring changes.

Why does my Ford pickup have a diesel engine?

If you daily drive a Ford pickup with a diesel engine, you are likely familiar with a few of the shortcomings of battling a cold winter. On a cold start, the stock idling setup only warms up the engine so much, causing the heating system to perform at less-than-optimal levels.

What happens to a diesel engine when it idles?

3. Idling harms your engine. Does idling hurt a diesel engine? Yes. When a diesel engine idles, it does more damage to the engine than normal operation. Operating a diesel engine at a low speed will cause two times the wear on the internal components compared to operating at normal load. This will raise maintenance costs and shorten engine life.

Why is the idle speed higher than the RPM?

Occasionally, the engine RPM will be higher or lower than this average for multiple reasons. Some performance engines, such as those installed in racing engine, are designed to idle higher than average. In general however, there are two problems that can cause engine idle speed to fall outside of specifications:

Is it necessary for a truck to idle for a long time?

There really is no need for a truck to idle for long periods of time anymore. Although in some cases it will be necessary, it should be avoided. The same goes for equipment.

What causes high idle problems?

Normally a vacuum leak is the most common cause of a high idle but many issues may cause this. Other possible causes of a high idle are improper sensor inputs, an idle air control valve, a faulty engine coolant temperature sensor , a stuck throttle body, a throttle body cable stuck,…

Is your vehicle idling rough?

If your vehicle is experiencing rough idling, you’ll probably know it immediately. While some cases are less severe than others, a rough idle is usually identifiable by a shaking and bouncing sensation in the vehicle. You may also notice odd sounds, as well as inconsistent RPM counts. Normally, a vehicle should have a smooth and consistent RPM rate of around 1,000 . If your vehicle is falling below or rising above this you may be dealing with an idling issue.

What causes low engine idle?

Ok, there are several possible causes for low idle/stalling when engine is cold – low fuel pressure, vacuum leak, faulty coolant temperature sensor, faulty Throttle Position sensor , faulty mass air flow sensor, sticking throttle body throat plate.

What is normal idle RPM?

For a passenger car engine, idle speed is customarily between 600 and 1000 rpm. For medium and heavy duty trucks, it is approximately 600 rpm.

Why does my car make a ticking noise when I idle?

A ticking noise could be caused by any number of reasons, such as a low amount of oil and loose components. You may hear the ticking noise while the vehicle is idle, accelerating or even after you have received an oil change.

Why does my car idle when I Turn on the ignition?

A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate.

Why does my 2005 350Z touring overheat when idle?

Check you radiator fan clutch, it is activated by a sending unit and temp sensor. 2005 350z touring overheats while in stop and go . recently ran just to High range while idle on very cold day. Coolant change and power wash radiator did not cure problem

How can I get my turbo spool up faster?

If you are using a standard control system, they can often be re-tuned to get a faster spool up also. If your engine is upgraded with adjustable camshaft timing gears, you can often move them a few degrees in advance and retard. By adjusting these, you can often get a faster spool up.

What causes turbo lag and slow turbo spool?

Here are some of the most common causes of slow turbo spool and increased turbo lag. A boost leak or an exhaust leak is the most common problem when it comes to turbo lag. Exhaust leaks are affected if the exhaust leak is at the manifold before the turbocharger.

Is the EGR valve supposed to run during idle?

However, this EGR valve isn’t supposed to operate during idle, at wide open throttle or before the engine is warmed up. If it runs at any of these times, the performance of the engine is affected.

What causes the engine rpm to go up when idle?

When the engine idles, there will usually be a misfire that you can feel just from holding onto the steering wheel. Furthermore, the RPM of your engine will be higher than normal when the vehicle is idling. The RPM will usually go back to normal as you accelerate the vehicle, but will increase again after you stop.

What happens to your car when you idle it?

When the engine idles, there will usually be a misfire that you can feel just from holding onto the steering wheel. Furthermore, the RPM of your engine will be higher than normal when the vehicle is idle. The RPM will usually go back to normal as you accelerate the vehicle, but will increase again after you stop.

Is there a way to reset the throttle body?

This method is almost foolproof as long as all ECU control parameters are within their normal ranges. Resetting The Throttle Body Calibration (this step is conditional) A Rough Idle or a SES can sometimes be caused by a change in the throttle body position sensor calibration.

How does throttle bore work on car engine?

Step 5 – A throttle bore is used to regulate the volume of air flow the engine consumes. Controlled either by computer or by manual foot pedal this device must be clean and free from coking build up (light tar substance.)

The way diesel engines produce power is different from gasoline engines. Every time the injectors push fuel and air into the chamber, the spark plugs deliver the electrical current. This keeps the engine running. If you have a weak or poor quality spark plug, then it is possible that it will lead to car stalling.

When is it OK for a truck to idle?

Fortunately, some states where extremely cold temperatures are common have built exceptions into their laws that allow truckers to idle if the outside temperature is below a certain temp. For instance, New Jersey will allow a truck to idle for no more than 15 minutes each hour when the temperature is less than 25 degrees outside.

How long can a truck idle in New Jersey?

For instance, New Jersey will allow a truck to idle for no more than 15 minutes each hour when the temperature is less than 25 degrees outside. Obviously, these laws are being passed to help protect the environment from unnecessary emissions. However, many argue that these laws are punishing the people that aren’t in a position to fix the problem.

Why does my diesel truck not start in the Cold?

Extremely cold temperatures can create havoc on a truck running diesel. In fact, diesel fuel will thicken as it gets cold. Sometimes, it gets so thick that it can’t flow properly thru the fuel lines and fuel pump. Once it reaches this point, the truck becomes extremely difficult to start.

Fords are designed to operate with the resistance in the solenoid in a range between 7.0 to 13.0 ohms. If the resistance is outside that range, the idle control motor needs to be replaced.

What causes a choke to stay on fast idle too long?

Stays on fast idle too long: The choke spring tension is too tight, the heat source is not being supplied or is blocked, or the fast-idle cam is gummed up, bent or has another problem that does not allow it to drop.

What happens to choke spring when engine is shut off?

As the engine warms up, the spring tension is reduced until the butterfly is completely open and has no impact on the signal the carburetor venturi (booster) is exposed to. When a hot engine is shut off and starts to cool, the tension on the choke spring increases in lockstep with the drop in temperature.

Stays on fast idle too long: The choke spring tension is too tight, the heat source is not being supplied or is blocked, or the fast-idle cam is gummed up, bent or has another problem that does not allow it to drop.

As the engine warms up, the spring tension is reduced until the butterfly is completely open and has no impact on the signal the carburetor venturi (booster) is exposed to. When a hot engine is shut off and starts to cool, the tension on the choke spring increases in lockstep with the drop in temperature.

Are there any problems with a 7.3 liter diesel engine?

The legendary 7.3 Power Stroke Diesel engine, when properly maintained can provide years of trouble free service. However there are several common problems that can develop over time. Generally speaking these can all be resolved relatively easily. Listed below are 9 common problems of the 7.3 Liter Power Stroke Diesel engine.

How long does a rough idle last in cold weather?

Rough idle in cooler weather below 50 degrees. Runs fine while driving at speed, but rough idles or stalls when stopped. The rough idle clears up after 15-20 minutes or so when the air temp is above 45, but it lasts longer when temps are below 45.

Can a Ford Expedition idle in cold weather?

This has been happening for years, only when below 28 degrees and only on idle at a stop light. Engine RPM’s drop then rev back up until I accelerate. Once weather warms up it stopped. This winter, which was really brutal for Salt Lake, it started before the cold season and finally got a “check engine light’.

The legendary 7.3 Power Stroke Diesel engine, when properly maintained can provide years of trouble free service. However there are several common problems that can develop over time. Generally speaking these can all be resolved relatively easily. Listed below are 9 common problems of the 7.3 Liter Power Stroke Diesel engine.

What causes a 7.3 power stroke engine to not start?

7.3 Power Stroke Diesel Common Problem #1 : Causes No Start : Injection Pressure Regulator (IPR) Valve, located in the valley on the High Pressure Oil Pump (HPOP). These can stick, seals get damaged, have the sensor go bad or the wires get damaged.

What happens to my GMC Sierra 1500 in cold weather?

In cold weather my 2000 sierra starts, reves up idles back down to rough idle and continues to do so for about a minute. Once it warms up runs great and does not do this in warm weather. Have had several sensors replaced (even tho they checked good) and just had a tune up done on it. Mechanic can’t figure it out.

What to do with a high idle Ford Mustang?

This is the fix for a stuck/high/surging idle. Example: You pull up in the driveway or to a stop light with the clutch in and the car idles it self up to 2K or 3K rpms and then stays there, then finaly drops down when it wants to.

How do you do an idle Relearn on a Ford?

Follow these steps to complete an Idle Relearn: With vehicle at a complete stop, set the parking brake. Put gear shifter in “P” (Park), turn off all accessories. Run the engine until it reaches normal operating temperature.

What causes a rattling engine in a Ford F150?

October 29, 2019 by Jason A rattling engine can be very disturbing. If your Ford F150 is experiencing this problem, we’ll cover the most common causes. A rattling engine can be caused be the exhaust, timing chain, loose accessories, and much more.

What’s the idle speed on a Ford truck?

With the orange, you can also wire in a resistor to make the idle stay anywhere from 1200-2400, and it will stay there and not vary, using the resistor. Also, with a manual tranny, the resistor is required.

What’s up in the Forum Ford diesel truck high idle mod?

Ryaneverk2 was the first to reply, including links to Ford Fleet materials along with including the following list of items needed. As you can see, he took a humorous approach to this list.

Why is my car engine not idling smoothly?

Car engine idle problems could be low idle, lumpy idle, slow idle, and bad idle and fast idle The engine is not idling smoothly, or when it idles, it stalls when your car engine is cold. Another one. Your car engine is cold, your foot has been taken off the gas pedal and the engine is running very rough. Stalling may occur here. 1.

What happens when the idle control valve fails?

When the idle control valve fails it can cause all sorts of issues with the vehicle, and in some cases may even render it undrivable. Usually a bad or failing idle control valve will produce a few symptoms that can alert the driver of a potential issue. 1. Irregular idle speed

Can a faulty idle air control cause a problem?

A faulty idle air control (IAC) valve can cause a number of problems with your vehicle: 1. Incorrect idle speed: An IAC valve that sticks in the closed position will create an idle speed that’s too low.

3. Engine stalling The idle control valve, also commonly referred to as the idle air control valve, is an engine management component that is found in one form or another on the majority of road going vehicles.

Why does the engine RPM increase when you clutch in?

When you clutch in,you actually disengage the clutch from crankshaft or flywheel .So ,the contact from wheel to to crankshaft is detached and there is no load on engine .so eventually engine rpm will increase because you have removed the load.

What happens when you release the clutch pedal?

Slowly release the clutch pedal. As the clutch engages the flywheel and pressure plate, the engine should stall. If the engine doesn’t stall, then the clutch is slipping. Watch the video below.

How can I fix idle issues on my car?

Pull the ecu and check the board for damage. Vacuum leaks, TPS settings, BISS settings, throttle cable adjustment, stop screw adjustment. All of these have cause idle issues on my car at one point or another. The real kicker is that they’re all related, so fixing one means going back over the others. Loading… Loading…

What causes a fast idle on a talon?

Terry’s Talon Troubleshooting Tips #3 – Fast Idle (aka. Idle Surge) sounds like a surge or similar idle issue, good reading here. Yep, those are the signs of a faulty ecu..caused by leaking caps.

What’s the idle speed on a Highlander V6?

I own an `04 Highlander V6. Whether winter or summer, when you first start the car after sitting overnight, the idle immediately races to 2,000 rpm, then drops to 1,800 rpm. It will then idle at 1,800 rpm for another whole minute or so, and then slowly start to drop off to 1,600 etc until it reaches about 1,300 rpm after about two full minutes.

What’s the idle speed of a car in winter?

Whether winter or summer, when you first start the car after sitting overnight, the idle immediately races to 2,000 rpm, then drops to 1,800 rpm. It will then idle at 1,800 rpm for another whole minute or so, and then slowly start to drop off to 1,600 etc until it reaches about 1,300 rpm after about two full minutes.

Author Image
Ruth Doyle