What causes a car to stall while idling?

STALLING DUE TO LOW FUEL PRESSURE If the engine stalls while idling or driving, the engine may be running out of fuel or not receiving enough fuel pressure to keep it running. The most likely cause of this kind of stalling would be a fuel pump that is not spinning fast enough or is intermittently cutting out.

What causes a Cadillac Escalade engine to stall?

If the converter doesn’t unlock, then the engine will stall much like a manual vehicle does when it doesn’t have enough speed to carry a gear. It’ll often throw code P0740. If there is almost no oil left at all, the engine could be on its way to locking up.

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.

What happens if you have a bad idle control valve?

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. The idle speed may be too high at one moment and then too low at other moments.

There were no warning signs, no indicator lights, everything seemed fine, it just shut off. Why does a car die while idling in Park? When your engine dies while idling, there’s a good chance that it stalled. What causes a car to stall out? Usually, it means the engine isn’t receiving enough air, power, or fuel.

What should the idle speed be in neutral?

In Park or Neutral it idles up at 1500. But when I drop it into drive it goes all the way down to around 600. This seems like an excessive drop to me. I had to set the curb idle high so that when it went into gear it wouldn’t stall out.

What should I do if my engine is stalling?

Cleaning the idle air bypass circuit in the throttle body with aerosol throttle cleaner; will often remove the gunk and solve your stalling problem. If a good soaking with cleaner fails to fix the stalling problem; check the wiring connector. It might be loose or corroded.

What should the idle be on a car?

Timing is set at 13 degrees. Thanks in advance for any advice!! Adjust your mixture screws and lower the fast idle for the choke. Check the timing both in and out of gear. If the timing is falling way back in gear, that’s most of your problem.

Can a stalling engine be intermittent driveability?

Intermittent driveability problems of any kind are always a challenge to diagnose. When a customer brings you a vehicle and complains of a stalling problem, you may not have much to go on other than their description of what’s happening and when it happens.

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.

Is there check engine light for intermittent stalling?

Many times, there will be no check engine light and no fault codes to give you a clue as to what might be causing the engine to stall. So the trick to diagnosing an intermittent stalling problem is to catch the vehicle when it’s acting up — and that rarely happens when you have the vehicle in your shop.

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.

What are the symptoms of an engine stall?

Here are some of the most common symptoms of, a faulty mass airflow (MAF) sensor; The engine is very hard to start or turn over. Engine stalling shortly after starting. The engine hesitates or drags while under load or idle. Hesitation and jerking during acceleration.

What causes an engine to stall in cold weather?

Engine stalling problems can be hard to find and are often sensor or temperature related. Engine stalling is more likely to occur during cold weather or when starting a cold engine. So, this kind of engine stalling problem often means the engine is not getting enough fuel and/or too much air.

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.

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.

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.

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.

What to do when your engine stalls in reverse?

Work the transmission through ALL the positions on the shifter, pausing at least 2 seconds between each position. Put the truck in park and let it idle. Then check your fluid level on the dip stick. The fluid should be between the two “hot” position holes on it.

Why does my car stall when cold in reverse?

Stalls always when cold in reverse sometimes it does stall in drive, but not as often. Aside from the stalling it runs great. Had solenoid that controls TCC changed and that did not help. This problem is driving me crazy. Had a mechanic freind change the O2 sensors to solve another problem (cat efficiency codes).

Why does my truck stall when shifting into Park?

Also if i rev up the engine while shifting into drive the engine still drops significantly in rpms, but does not stall. Once in drive it operates great. Shifting into park, reverse and neutral are normal. I’ve already replaced the neutral safety switch and idle air control valve with no success.

How can I tell if my car is stalling?

So the trick to diagnosing an intermittent stalling problem is to catch the vehicle when it’s acting up — and that rarely happens when you have the vehicle in your shop. You may have to keep the car and drive it for a few days to see if it stalls.

What happens if your car engine stops while driving?

An engine that stops all of a sudden will cause you to lose control of your vehicle to some degree, especially if you’re driving fast. You also won’t hear it running anymore. This can happen with old and new cars as well. There are all sorts of reasons as to why a car engine would stop suddenly while you’re driving.

What causes a carburetor to stall when accelerating?

If the engine either hesitates or stalls upon acceleration due to the carburetor, the carburetor’s accelerator pump nozzle may need to be cleaned or the secondary throttle plates may not be closing all of the way. Occasionally, the carburetor’s idle jet will become clogged with dirt, which will cause the hesitation or stall.

Why does my Chevy Impala stall when cold?

We thought the car problems were consistent (always starts when when cold, sometimes won’t start when warm, but will eventually start when engine gets cold), but it threw us a curve the other day when the engine stalled while my wife was turning into our development. Luckily, she was able to coast it a half mile to our driveway.

What causes a 6.5L diesel engine to stall?

SYMPTOM: Your 6.5L Diesel stalls just as if someone had reached over and turned off the ignition switch. CAUSE: There are two main causes. The first and most common is the PMD (also called FSD).

Why does my car stall at highway speeds?

The engine may start and idle fine, but run out of power or even stall at highway speeds. If the engine starts right back up after stalling, the likely cause is low fuel volume delivery because of a weak pump. If the engine is running normally one minute, but suddenly quits, loss of ignition may be the problem.

Why does my carburetor not start when the engine is hot?

If the idle screw is not screwed in far enough, the engine simply is not being supplied with enough gasoline to idle. Another cause which can be traced to the carburetor is a float level which is set too low. If the engine will not start when the engine is hot, the choke may be stuck in the closed position, typically due to a lack of lubrication.

How to fix a Mazda that stalls at stop?

Remove the air hose from the throttle body. Disconnect the throttle body connector. Remove the throttle body from the intake manifold, with the water hose connected. Clean the throttle body on the air hose side using a soft, clean shop cloth, sprayed with engine cleaner (Mazda recommends their P/N 000-77-A86).

How does the PCM control the idle speed?

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. 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.

Why do Truckers leave their trucks idling at night?

The primary reason that truckers leaving their trucks idling during the night is to regulate the temperature inside their truck while they are sleeping. Many times, the insulation of the cab is good enough that drivers can sleep comfortably in the cab of their truck.

What should you do if your car engine dies while driving?

There are 4 steps that you should do if you notice your engine has died while you’re driving: Guide the car to the side of the road. If your car was moving when its engine died, it will probably still have enough speed and momentum for you to coast to the side of the road.

What causes a car to die while driving?

Common Causes Why a Car Dies While Driving. Before we learn how to diagnose a car that dies while driving, here are some of the most common causes you might want to know: 1. Bad Battery (and weak alternator) This is quite a common issue.

Why is my Dodge Dakota idling and dying?

My dakota will start then idle down and die. I can pump the gas and it will stay running but if i hold the peddle down or let off it will die. I have replaced the fuel pump, fuel filter, and the idle air control valve. could it be the map sensor or o2 that is causing this please help. I have had the same problem, and this corrected it.

When to use hard steering on a car?

Hard Steering is when steering effort at the steering wheel is more than 200 inch pounds (typically 18-22 lbs at the rim of the steering wheel). Steering is still possible, but there is not enough power assist. Common phrases used: • Won’t turn • Hangs-up • Locks-up • No assist • Shuts-down • Won’t turn unless moving • Turns hard 2.

Why is my Ford Ranger stalling and dying?

Because it is on the clean air side of the air filter it can collect fibers from the filter itself, it also collects dust particles and pollen. When it is plugged up the brain box sends the wrong information to the fuel injectors resulting in a poor running truck.

A common problem with air passages in the throttle, and the IAC valve itself, is carbon, dirt or fuel varnish buildup. If air can’t go through the air ports when needed, the engine may stall when you reach a stop or while the engine is idling. Locate the IAC around the throttle body. Unplug the IAC solenoid electrical connector.

What to do if your car dies while idling?

Engage the parking brake, start the engine, and let it idle. Pop the hood open. Wiggle the battery cables, including the small wire that connects to the car’s body, if your vehicle has one. If the engine shuts off and the headlights stop working while you do this, you are dealing with a loose, corroded or frayed cable or wire.

Why does my car shut off after I stop driving?

If you car shuts off after you stop it is because the engine is very sensetive at the idle. This can be caused by a lot of things but is usually caused by a lean fuel mixture, causing the idle to drop too low. A faulty throttle body can also cause this.

What causes an engine to die while driving?

On deceleration, engine rpms may fall below normal idle speed and stall. When reaching a stop light, the engine may jerk and die. While driving, the engine may suddenly shut off.

Why does the engine stop working at idle?

This actuator receives information from the electronic control unit (ECU) so it knows at what RPM to keep the engine for a smooth and safe idle. When the actuator malfunctions, the engine gets no signal for idling speed and stops working.

On deceleration, engine rpms may fall below normal idle speed and stall. When reaching a stop light, the engine may jerk and die. While driving, the engine may suddenly shut off.

What happens when a Chevy Silverado engine shut off?

The engine shut off, brakes went out, steering locked, all electrical shut off. The truck was dead for approx 4 seconds when it kicked back on on its own. The truck continued down the road like nothing had happened.

What happens if your car stalls while driving?

If Your Car Stalls While Driving, Safety First! When a car engine stalls, the car’s accessories also fail, as they draw power from the engine. That means your power steering assist and the power assist for your brakes fail.

What causes a car to stall at a stop light?

An engine that stalls when you reach a stop light or while idling may point to a faulty idle air control solenoid (IAC). The computer uses the IAC solenoid to bypass the throttle valve and inject more air, depending on engine operating conditions.

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.

When does a car stall at low rpm?

The RPM goes to 0 and the engine shuts off. This only happens when travelling at low speeds (e.g. slowly accelerating from a stop, braking, moving in stop and go traffic) This NEVER happens when I’m travelling above 10 mph (e.g. if I’m coasting at 40 and let my foot off the gas, the RPM can go to 500 RPM but it will never stall in this case).

What to do if your car stalls in the middle of the road?

If you are able to, steer the car to the shoulder or another safe spot out of the traffic flow. If you’re stranded in the middle of the road and aren’t able to coast over to the side, turn your hazard lights or emergency flashers on immediately.

How does the idle air control system work?

The car computer uses the idle air control (IAC) solenoid valve to control airflow and adjust idle speed when the engine is idling. But over time, carbon buildup from PCV and EGR system operation can accumulate around a throttle bore and plug IAC solenoid passages. Or the device itself may fail.

What to do when your car engine is idling?

Idling issues can be frustrating, but with some patient troubleshooting, you’ll have a real chance at figuring it out. Remember to always check your engine idle with the air conditioning and defroster turned off, as both of these systems are designed to change the idle when they are on due to the demands they place on the engine.

Why did my 94 Dodge Dakota shut off?

I had a 94 Dodge Dakota that did the same thing and that was at fault. You made no mention of whether it is hard to restart or not once it shuts off. If it hard to restart, I would look at the crankshaft position sensor.

When does your car act like its going to stall?

Acts like its going to stall during idle, sometimes hesit… While idling (stop light, stop sign) my car will act like it’s going to stall. Once in a great while it actually will. Also sometimes while taking off from a stop light it’ll either stall or just take off slow.

What’s the difference between a stalling engine and a not starting engine?

One of the main difference between and engine that will not start and one that stalls while in operation is the ability for the computer to detect the problem.

What does it mean when your car is stalling at idle?

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. These should be investigated, diagnosed, and repaired as soon as possible.

Why does my Chevy Tahoe stall at idle?

We took carborator/ throttle body cleaner, sprayed and cleaned the carbon out. Apparently, carbon starts to build up in the throttle body where the flap is and it throws off the sensor. Since than the idle is back to norm and it has not stopped on us once.

Why does my 1993 Chevy TBI stall at idle?

Timing is steady and not jumping all over. It is a fuel issue. The only code that ever sets is a P044, lean exhaust, and the exhaust is really lean. We have swapped PCM/PROM with a same year Suburban, no change. Both vehicles run the same as this did using the other’s PCM.

Why does my car stall when put in cold?

stall occasionally when stopped after warmed up. takes longer to start when cold and will stall instantly after start up unless pressing the gas pedal. once warm and somewhat stable idle will stall when put into gear. any ideas? Vacuum leaks can cause a lean condition and/or possibly a high idle.

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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 does my Dodge Ram idle and stall?

Finally found there is a sensor in the gas tank that reads when fuel level is low and shuts truck off to prevent damage etc. The sensor isn’t needed so after he removed it it no longer has those problems. My dodge iddles rough and has a code that says running lean on some cylinders. Another problem is my filter never gets dirty.

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.

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.

What should the fuel pressure be at idle?

Fuel pressure should be within specifications when the key is on, then drop 4 to 6 psi once the engine starts and is idling. Note: Some vehicle manufacturers list pressure specifications for both KOEO and idle, while others only list a fuel pressure specification for one or the other.

What do you do when your car is stalling?

The Fix: Clean or replace fuel injectors. Even after the engine has run long enough to become warm, the idle speed does not come down to normal but continues to idle at a fast pace. You really notice it when you come to a stop, after which you have to push hard on the brake pedal to keep the car from moving.

What makes an automatic car run at idle?

Torque Converter In the transmission of an automatic car, there is a torque converter, which takes the place of a mechanical clutch. The idle circuit in an automatic vehicle controls the air that is circulated when the car idles. Most automatic cars have an oxygen sensor that keeps track of the oxygen levels in the air that is pushed out.

What should I do if my car stalls when shifting into drive?

However if I start my car in neutral and shift into drive everything is fine. Also if i rev up the engine while shifting into drive the engine still drops significantly in rpms, but does not stall. Once in drive it operates great.

What causes a fuel injected engine to stall?

Fuel pressure should be within specifications, when the key is on; then drop 4 to 6 psi once the engine starts. Idle speed on a fuel injected engine is controlled by; allowing a small amount of air to bypass the throttle. The most common failure is partial/complete jamming of the actuator (due to dirt/dust or even oil).

What kind of engine stalls when shifting to idle?

Mercruiser 5.7 engine stalls when when shifting to idle or gear. Will not restart I recently purchased a 95 Larson Escapade with a carburated mercruiser 5.7 engine and mercruiser out drive.

What to do if your car stalls while idle?

On the other hand, if the engine gets stalled while your vehicle speed is idle, you cannot steer it to the roadside. At that time, let’s turn on the hazard light and call the roadside assistance or the police. It doesn’t absolutely get out of your vehicle. Don’t push your car while you are on a busy road.

What causes a car to die at idle?

One of these is a lack of fuel, meaning if there’s a problem in your fuel delivery system, it can result in your car dying. Any component of the fuel delivery system can cause this. Take the fuel pump, for instance, which is in charge of delivering fuel to your engine from the gas tank.

Why does my lawn mower stall when I Turn on the engine?

The richer fuel mix helps counteract the dense oxygen rich cold air. As the engine warms up, moving the choke lever to off, opens the flap again. However if the flap doesn’t open, the engine will stall as it’s now getting too much gas. You can check the choke operation by removing the air filter and moving the choke lever.

What causes a small engine to stop after a few seconds?

Common solutions for: Small engine stops after a few seconds 01 – Carburetor The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the engine for a long period of time.

Why does my engine not restart when it’s Hot?

If there is puffing or popping near the engine head, the head bolts might not be tight. If the engine spins over too freely when it’s hot.. indicating much lower compression, check the torque of the head bolts.. if they were loose, the engine should now restart.

What causes a car to start and then die?

But if there is a fuel leak somewhere, then the proper amount of fuel won’t be able to make it to the combustion chamber. This might cause the engine to still start, but it won’t be able to keep it running. That is why it will die almost immediately after it starts.

Why does my car stall after a few seconds?

A clogged carburetor is most commonly caused by leaving fuel in the engine for a long period of time. Over time, some of the ingredients in the fuel may evaporate, lea…ving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to stall.

What happens if you have an engine misfire?

An engine misfire can cause a lot of stress for a vehicle owner as it makes their car more difficult to drive. This stress can be amplified if your mechanic tells you they’re not entirely sure what is causing the problem.

When does the idle air control valve stall?

However, when the engine RPM drops below the normal range of 800 RPM (for most cars), it is more than likely that you are dealing with an IAC valve problem. In cases where this valve is clogged or is nearing its replacement age, your vehicle will stall instead of idling after the release of the throttle.

How can you tell if your car engine is misfiring?

Rough acceleration is a typical sign that your engine is misfiring. Sometimes, the engine will misfire on idle also; your engine sensors will get faulty values, and the air-fuel mixture will get messed up. This can cause a very uneven idle, which can jump up and down, and the engine may also shut off on idle.

What causes a car engine to misfire at idle?

Worn piston rings, worn or broken valves and worn cylinder walls, as well as worn cam lobes can also contribute to the problem. When the engine misfires, you may have trouble getting your vehicle up to speed.

What causes an engine to stall while idling?

This can upset the air/fuel mixture causing idle, stalling and hesitation problems. Cleaning the airflow sensor wire with aerosol electronics cleaner; can often restore normal operation and cure the problem. If the engine stalls while idling or driving, the engine may be running out of fuel.

How can you tell if your car has a misfire?

You won’t always be able to sense a misfire, even when your check engine light is triggered. However, one symptom that you will likely notice is a rough idle. When your vehicle misfires, it can throw your air/fuel mixture way off. This will cause your engine to “sag” or “lurch” unevenly when you’re sitting still.

Why does my car stall when I start the car?

Engine stalling problems can be caused by, almost anything but, are usually sensor related. A cold engine needs a fairly rich fuel mixture to start, and to idle smoothly while it warms up. What do you look for when the car starts to shake and sputter eventually causing engine stalling.

Can a bad throttle position sensor cause stalling?

Similarly, if your engine struggles to idle efficiently, it could also be a result of a damaged throttle position sensor. Stalling, surging, or hesitating while idling all can be caused by this unassuming sensor. The best way to determine if these issues are caused by your throttle position sensor is to go to the source.

Can a bad coil on an engine cause a misfire?

A bad coil on an engine with a distributor and a single coil will typically cause a no-start, or misfire due to a weak spark. But if the coil has an intermittent open, it could cause a momentary loss of spark that would kill the engine.

If the car still stalls, it is certain that the source of the problem is a blocked fuel filter. You can easily replace it though and it is pretty cheap too. A broken fuel pump cannot properly transfer fuel from the oil tank to the engine, causing the fuel pressure to reduce.

Clogged Fuel Filter If the car dies while idling but restarts later, drive the car up and down a steep road to see if the problem persists. If the car still stalls, it is certain that the source of the problem is a blocked fuel filter. You can easily replace it though and it is pretty cheap too.

What causes a car to die but restart later?

Issues with the Wiring Harness. A car dies while idling but restarts later due to misfiring ignition too. If the wires in the wiring harness are corroded or loose, the car will lose voltage because of the unstable connection to the ignition circuit.

What causes a Ford Taurus engine to stall?

If your Ford Taurus’s engine timing is off, it’s going to stall out, misfire, and altogether not run properly. Here are some of the more common causes of an engine timing problem: VVT Problem– Many modern engines are equipped with Variable Valve Timing.

What to do if your Taurus is stalling?

Before troubleshooting any automotive issue, including stalling issues with the Taurus, make sure that you check the vehicles trouble codes with an OBD2 scanner. Trouble codes are always a great place to start diagnosing problems on today’s modern computer controlled vehicles. Without them, you are in the dark. These codes are vital to diagnosis.

Can a bad gas tank cause a car to stall out?

Bad gas-can cause an engine to stall out. Water in the gas tank can also cause gas to not fire properly. If there were no other symptoms and suddenly you find that the vehicle is running very rough, bad gas could certainly be the problem.

Why does my VVT keep stalling out?

If there is a VVT issue, it’ll often throw trouble P0010, P0011, or other related trouble codes. This is often the cause of the stalling. Timing Chain Jumped– If your timing has jumped a tooth or two, it’ll definitely stall out. Just know, that if it jumped a tooth, it’s only a matter of time before it jumps more or breaks all of the way.

Why does my car hesitate when I start the engine?

Repair or replace any hoses which are causing the leak. If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine won’t get the proper amount of fuel it needs for combustion. This will cause your engine to lag, stumble, or hesitate.

What causes a car engine to stop working?

Why does my car accelerate when the fuel pump is not working?

When this mismatch becomes great enough, the pressure in your fuel lines can become inconsistent. In these circumstances, drivers may find their cars suddenly accelerating for a few moments even when they haven’t pressed the gas pedal, a condition known as surging. 5. Fuel Pump Failure Might Be a Reason Why Your Engine Won’t Start

What causes a car engine to stop running?

Intermittent faults in ignition modules can also cause an engine to suddenly stop running, and are often heat-related. When the module overheats, it quits working — but starts working again after it cools down (say 15 to 30 minutes later).

Why does my Chainsaw stall at low speed?

An engine stalls when it’s getting too much or not enough fuel from the carburetor. Stihl chainsaw carburetors usually have three adjustment screws: one each for idle, low speed and high speed.

What causes a motorcycle to stall at idle?

Extremely lean motors can also stall out completely when given some light throttle. Another sign of lean running is the “hunting idle” where the motorcycle revs up randomly, changes RPMs, or takes forever to come down to idle.

Why does my car stall when I put the accelerator down?

When an idle control valve becomes contaminated or stuck, it may lead to an unsteady and rough idle. The car will stall if the valve is too clogged or when it finally fails. If, while holding the accelerator pedal down, a small amount of pressure keeps the car running at a stop, the idle control valve may require attention.

What causes a car idle to be unbalanced?

Since a smooth idle depends on just the right mixture of fuel and air, there can be many possible places where that combination is getting unbalanced. Some of these causes can be simple, and some can be complicated.

What to do when your car won’t idle properly?

Your engine computer notices these tiny, gradual changes and compensates for them. As a driver, you don’t notice these small changes, but they keep your vehicle idling smoothly as the miles pile up. By going back to the default settings, your engine can no longer idle properly. You have a problem. Get it diagnosed by a professional

What causes a car to stall while idling?