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Why is my Chevy Silverado running rough at idle?

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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.

Why are the spark plugs on my Chevy Silverado not working?

Spark Plugs – One of the absolute most common causes (if not the most common reason that your Silverado may be misfiring) is the spark plugs. Although most modern vehicles use iridium spark plugs, they still need to be changed at the manufacturers recommended interval.

Is the Chevy Tahoe still running rough at low rpm?

Since replacing them, it runs much better. It still starts rough, and seems to stutter occasionally at low RPM but seems to be fine under load or at RPM above 1500. At this point I’m completely stumped.

Why is my GM 4.8l engine running too lean?

The engine may be running too lean, due to a leaking intake manifold. Too lean means too much air and not enough fuel; according to the power control module (PCM) calculation. When the engine is cold, not all sensors function. As the engine warms up the oxygen sensors report the lean condition.

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.

Are there any problems with the 5.3 liter Chevy engine?

The 5.3 engine not only can succumb to engine sludge, but to faulty sensors. While this is a very common problem with this type of engine, it can be frustrating nonetheless. There are some quality oil sensors that will increase the performance.

Spark Plugs – One of the absolute most common causes (if not the most common reason that your Silverado may be misfiring) is the spark plugs. Although most modern vehicles use iridium spark plugs, they still need to be changed at the manufacturers recommended interval.

What kind of spark plugs do I need for a Silverado?

The spark plugs fit on the Chevrolet Silverado besides a host of other such vehicles. The spark plug from this reputed brand is high on performance for a long time and that too preventing corrosion. The spark plugs also guarantee rough use of a long time, before you get to replace these. 4. NGK (3951) TR55 V-POWER Spark Plug

Is the Chevy 5.3 liter engine without problems?

In fact, it is not a rare occurrence for a 5.3 Chevy to go above and beyond 200,000 miles. However, no engine or car is entirely without flaws. If you are in the market for a Chevy 5.3 vehicle, there are some things to look out for.

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.)

What kind of engine does a Chevy Silverado have?

The initial run of the Chevy 5.3-liter V8 comes in the third generation of Chevy’s small-block V8 engine. For marketing purposes, this engine is known as the Vortec 5300. As we mentioned before, it first became available in 1999. You’ll find this engine in the Chevy Silverado and Avalanche as well as the GMC Sierra.

What kind of rough idle does a Silverado Sierra have?

: Vortec 5300 5.3L V8 Rough idle in 5.3 when at temp. Before I get flamed for posting yet another rough idle post. Please know I have spent nearly 2 months researching this issue on Silveradosierra.com, gmfullsize.com, and a few others to no avail. The truck is a 2005 sierra 5.3, 4L60E, Z71, 4×4, has 79,000 miles.

What causes a Chevy Silverado to run rough?

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

What to do with rough idle in 5.3?

Rough idle in 5.3 when at temp. AC Delco spark plugs, check all vacuum lines for cracks, leaks or poor fitting.; run gas line anti-freeze to clear up any moisture that may be in the fuel system. Re: Rough idle in 5.3 when at temp. I did not see any discussion on checking the idle air circuit or idle air control valve.

What’s the fuel pressure on a Silverado Sierra?

1. New Bosch Iridium spark plugs gapped to pre-gapped 2. Brand new ACDelco plug wires. The actual OEM ones, not the 3rd party set being rebadged 3. Fuel pressure is 57 PSI key on engine off. And 64PSI engine at idle while at temp.

What makes a Chevy 5.7 TBI run cold?

The regulator is spring loaded and if the pressure isnt enough the fuel doesnt even get to the return line.. Its a hell of a lot easier than checking it with a gauge. There is a temperature sensor that tells the computer how to mix fuel/air since the truck does not have a choke. I have had to replace this sensor on a few of my past trucks.

What makes a 1988 Chevy 5.7 TBI run rough?

1988 Chevy 5.7 tbi runs rough cold and…. Ok here is the deal. This truck has a good motor but it lacks power all the time not like barely moves but it won’t burn rubber. Now when its cold it runs really rough coughing and sputtering.

What should the idle speed be on a GM TBI?

Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM. Turn off the engine and disconnect the negative battery terminal from the battery using a wrench.

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.

Why does my Silverado have a misfire light?

The truck runs perfect around town and on the highway but the misfire is relative to RPM. If i hold the revs at 1900rpm or more it misfires and the SES light flashes. So on the highway at about 70mph or over it will miss. around town it does not unless i put the shifter into 2nd and let the RPMS climb. The Truck has Had a FULL Tune up.

What causes a misfire on a Silverado Sierra?

I have had a couple weird misfire issues in the past from a cam lobe starting to go down. most recently a couple weeks ago on a 07 tahoe with a 5.3l, I went down the same road you have been going down, finally found it by taking the valve cover off and running the engine.

Why does my Silverado Sierra have a leak?

It could be a bad coil or a vacuume leak. Both are fairly common problems. Since it is a random misfire I would lean towards a vecuum leak. The intake gaskets are pretty common to leak.

What makes a GM 4.8L misfire engine stall?

P0306: Cylinder #6 Misfire. P0307: Cylinder #7 Misfire. P0308: Cylinder #8 Misfire. Really bad gas mileage. Lack of Power when you accelerate your van, pickup or SUV. Engine may start, run for a few minutes and stall.

What are the symptoms of a misfire in a GM Truck?

The core symptom of a misfire is rough idle. This isn’t the only symptom that your GM van, pickup or SUV might experience… here are some more that you might see: P0300: Random Cylinder Misfire. P0301: Cylinder #1 Misfire.

Is there an issue with the envoy’s rough idle?

No Codes Having an issue with a rough idle condition, goes away at about 700 rpm. Accelerates fine and top end is fine. Just a pronounced misfire at about 500 rpm. Cleaned TB, run BG44k through tank. Cleaned Camshaft actuator solenoid. Was clean even after 200k, first time I’ve pulled it. Pulled plugs, look fine.

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 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.

What causes a GMC Sierra 1500 to stall?

But the stable idle won’t last long, it’ll idle low and rough. Mpg has decreased drastically and give off a rich smell when running. 308 people found this helpful. Bad hesitation off of the start, pumping the gas pedal helps to get her going. Pushing the pedal hard well bog it out and almost stall. 290 people found this helpful.

What kind of idle does a GMC Sierra have?

After the truck starts and is warm at a stable idle in park/neutral it’ll rev up fine. But the stable idle won’t last long, it’ll idle low and rough. Mpg has decreased drastically and give off a rich smell when running.

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.

What makes a 91 Chevy surging at idle?

My father in law’s ’91 Chevy was running poorly, so we put new plugs, wires, cap and rotor on it, and it’s running better, but it it still surging at idle. It basically almost dies out, and then surges back to life (probably a little higher than normal idle), then repeats continuously until you apply some throttle.

Why does my Chevy truck stall at idle?

Filter is not that old, and if plugged or if pressure regulator is malfunctioning, why do I never see fuel pressure at throttle body so much as waver lower than 12psi? Also, many times the lean condition will start just off idle so bad so that truck wil fall flat on its face and stall.

Why does my Chevy k1500 stall when gas is released?

I have been working on our 89 Chevy K1500 and am still having an idle issue. The truck idle drops and lopes and occasionally completely stalls. This usually happens when driving slow in town… backing out of parking space, letting off gas when coming to a stop sign or to park etc. It does fine to start and accelerate.

What causes a 1989 Chev crew cab to stall?

I have a 1989 v3500 chev crew cab with a 454. Started stumbling at low throttle, stalling when I came to a stop or any low rpm activity. Checked for vaccuum leaks, reset base idle, tested sensor components, ran Win aldl diagnostics, could not get it to run right.

Why does my Chevy Silverado lose engine power?

Keep reading to find at least one possible answer to “Why is my Chevy Silverado losing power?” Read More: How Can You Tell If Your Pickup Is Overloaded? If your GM truck occasionally loses the ability to accelerate and warns you of reduced engine power, that could be caused by a faulty throttle body.

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.

What to do if your Chevy Silverado loses power?

While generally the Chevy Silverado is a premium, reliable truck, there are times when even the best vehicles can end up having problems. If you’ve ever had your Chevy Silverado or GMC Sierra suddenly lose power, you may be wondering exactly what is going on with your truck.

What are the symptoms of a Chevy 6.0L TPS failure?

Chevy 6.0L TPS Failure Symptoms 1 Rough idling, stalls at idle, jumping RPM’s 2 Lack of power, acceleration, etc. 3 Engine misfires 4 Irregular shifting

What causes a GM truck to lose power?

If your GM truck occasionally loses the ability to accelerate and warns you of reduced engine power, that could be caused by a faulty throttle body. While not common, this issue can interfere with your engine function and cause your vehicle to lose power anywhere from once in a while to several times in a day.

Why does my car stall at low rpm?

The will likely force your computer to stall the engine and only allow it to run at low RPMs, which means the car will only move at slow speeds. This is a safety feature enforced by the computer so that your engine doesn’t get too damaged.

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

What kind of engine does a 1996 Chevy Camaro have?

5) in 1996 the model with 3-door hatchback coupe body and V-6 3791 cm3 / 231.4 cui engine size, 149 kW / 203 PS / 200 hp (SAE net) of power, 305 Nm / 225 lb-ft of torque, 5-speed manual powertrain offered since mid-year 1995 for North America .

The will likely force your computer to stall the engine and only allow it to run at low RPMs, which means the car will only move at slow speeds. This is a safety feature enforced by the computer so that your engine doesn’t get too damaged.

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 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.

Can a bad spark plug cause rough 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 Spark happens to have them, they can go bad and cause a rough idle. Here’s a great video on how to diagnose bad plug wires with a multimeter.

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.

Why does my Chevy Silverado 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. We’ll cover the most common causes of rough idle below.

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 Spark happens to have them, they can go bad and cause a rough idle. Here’s a great video on how to diagnose bad plug wires with a multimeter.

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.

What’s the idle RPM on my Chevy Suburban?

My 1997 Chevy Suburban (5.7) is acting up on me. When I start it up the RPM and idle seem fine. As I let it sit for a couple of seconds the RPM’s slowly begin to drop until they finally bottom out at about 1K. As soon as I put it into Reverse/Drive etc. the RPM’s drop below that mark and it struggles to stay running.

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.

How does a GMC Truck increase idle RPM?

In order to increase the idle RPM, the control module will command the valve pintle to move away from its seat, allowing more air to bypass the throttle plate. To decrease RPM, the control module commands the IAC pintle to move closer to its seat, causing a lower airflow to bypass the throttle plate.

What’s the idle RPM on a 99 Vortec?

Truck recently had an exhaust manifold replaced. When its cold (as in first thing in the morning), it fires right up and high-idles for a few seconds and runs fine. After the first few seconds, its idles rough. The engine struggles to keep it above 7-800 RPM.

How does the Vortec rough idle in the winter?

When its cold (as in first thing in the morning), it fires right up and high-idles for a few seconds and runs fine. After the first few seconds, its idles rough. The engine struggles to keep it above 7-800 RPM. When its in gear at idle (like a stop light), it struggles to stay above 500 RPM, and will occasionally stall.

My 1997 Chevy Suburban (5.7) is acting up on me. When I start it up the RPM and idle seem fine. As I let it sit for a couple of seconds the RPM’s slowly begin to drop until they finally bottom out at about 1K. As soon as I put it into Reverse/Drive etc. the RPM’s drop below that mark and it struggles to stay running.

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 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.

Are there any issues with my Chevy Silverado?

Never had issues as long as I treated them right. the 57 Ford refused to break, the 51 Plymouth kept spinning rod bearings. Beat you vehicle, and keep shelling out money. 14 people found this helpful.

What’s the misfire code on a 2000 GMC Sierra?

Hey, I have a 2000 GMC Sierra 5.3l V8 with 161,000 miles (260,000kms) and It has a P0300 Random Misfire code. The truck runs perfect around town and on the highway but the misfire is relative to RPM. If i hold the revs at 1900rpm or more it misfires and the SES light flashes.

What kind of engine does a 2000 Chevy Silverado have?

Clean Title: No title issues reported. Description: Used 2000 Chevrolet Silverado 1500 LS with Extended Cab. This 2000 Chevrolet Silverado 1500 2dr Ext Cab 4WD 3D LT features a 5.3L 8 Cylinder 8cyl Gasoline engine. It is equipped with a 5 Speed Manual transmission. The vehicle is WHI with a Medium Gray interior.

How many miles does a 2000 Chevy Silverado get?

Mileage: 190,292 miles Body Type: Pickup Color: Black Engine: 8 Cyl 5.3 L Description: Used 2000 Chevrolet Silverado 1500 LS with 4WD, Trailer Wiring, Tinted Windows, Tow Hooks, Independent Suspension, Rear Bench Seat, and Front Stabilizer Bar 2000 Chevrolet Silverado 1500 LT 16 Photos

What kind of misfire does a Chevy Silverado have?

Yesterday on the way to work my 2000 Chevrolet Silverado 1500 4WD with the 4.8L V8 Vortec engine started flashing a check engine light. I read it and it was a P0300 Random/Multiple Misfire. I had experienced a slightly rough idle previously (nothing serious) and had been unable to track it down.

Where can I buy a 2000 Chevy Silverado?

Indigo Blue Metallic 2000 Chevrolet Silverado 1500 LS Vortec 5.3L V8 SFI 4-Speed Automatic 4WD Serra Saginaw Automotive in Saginaw, MI is where drivers from the Saginaw, Midland & Bay City areas go for their new and used vehicle.

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.

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.

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.

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.

How does rough idle on cold start 5.3L work?

It starts fine, goes to 900/1000RPM as usual and after a few seconds it starts to stumble. The RPMs drop to 500 and bounces to 700 for a few seconds, 5-10 maybe. Then it slowly starts to clear out. the idle will jump to 1100 then settles down at 900 and then slowly drops as per normal warm up.

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.

It starts fine, goes to 900/1000RPM as usual and after a few seconds it starts to stumble. The RPMs drop to 500 and bounces to 700 for a few seconds, 5-10 maybe. Then it slowly starts to clear out. the idle will jump to 1100 then settles down at 900 and then slowly drops as per normal warm up.

Why does my Dads 93 Chevy truck die?

My Dads 93 was doing what seems to be the same thing as yours. It ended up being the Fuel Pump Relay. If I press the gas pedal it dies. It’s been acting weird for a while now. For instance, when I take off from a dead stop at a light it sort of hesitates when I hit the gas.

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.

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.

What should the idle speed be on a Silverado?

When I have my AC on, which is all summer here in Phoenix, it works great when the idle is just above 500 RPM, but if it dips below 500 the AC turns to warm air (not good for the attitude when in the summer heat of Phoenix).

What makes a Chevy 5.7 TBI run rough?

If you have the throttle just barely open it will smooth out until it upshifts then it does it again until the rpms build. If I push in the throttle even 1/8th of the way in it just sputters and runs like crap.

Why does my truck idle when its cold?

When youre truck is just warming up, its still cold the efi is dumping fuel because its in like “Choke” mode. As it warms up, it leans the fuel air mix out to acomodate warm engine condition driving. So, when its idleing cold its got the fuel to compensate for the extra air leaking in.

When I have my AC on, which is all summer here in Phoenix, it works great when the idle is just above 500 RPM, but if it dips below 500 the AC turns to warm air (not good for the attitude when in the summer heat of Phoenix).

Why is my Great Lakes 4×4 running rough?

Also, when you idle the ammount of air and fuel mix is small, less air = less fuel needed for lower engine speed. While your engine is getting more air (vacuum leak) and this little bit of fuel that is being dumped at idle is not enough to creat proper combustion, and could cause your rough running condition.

What are the sensors on a Chevy Silverado?

The oxygen sensors that are equipped in your Chevy Silverado are responsible for monitoring the exhaust to help the ECU determine the correct air/fuel mixture. Of all the sensors equipped in your vehicle, the O2 sensors may have it the hardest.

What was the problem with my Chevy Silverado?

I was having a problem with my 2000 Chevrolet Silverado. It was starting hard all the time with the exception of first thing in the morning. The first start of the day would go just fine, but the rest would turn over and over rapidly until I pumped the gas pedal. Then it would start but it would sputter for a little bit.

How to troubleshoot a GM 4.8L 5.3L?

You can find this tutorial in Spanish here: Cómo Diagnosticar y Resolver Una Falla en Cilindro (GM 4.8L, 5.3L, 6.0L) (at: autotecnico-online.com ). The core symptom of a misfire is rough idle. This isn’t the only symptom that your GM van, pickup or SUV might experience… here are some more that you might see:

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.

How to know if your car engine is idle?

1. Start the vehicle. Allow engine coolant to reach operating temperature of 70°C (158°F) or greater. 2. Monitor fuel rail pressure (Actual, Desired) while engine is idling. Are the actual and desired fuel rail pressures greater than 5MPa from one another? Record test result and go to Step 5. Fail Test #1  Pass Test #1  

Why does my Chevy 1500 hesitate under acceleration?

Hesitation under heavy acceleration: 1st gear @ 20mph, 2nd gear @ 30mph, accelerates nicely to these points, then abruptly hesitates as if ‘bogging’ down. Have rebuilt throttle body, replace you either have a plugged fuel filter, a plugged converter or a bad mass air flow sensor

What causes a Vortec engine to leak fuel?

If this engine is a VORTEC then you may have a problem with the internal fuel system. Under the top plenum there is a fuel reg and poppet valves that inject fuel into the cylinders. Sometimes the tubes that run fuel from the reg to the valves can leak and cause your problem.

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 are the symptoms of a bad exhaust gas valve?

Symptoms of a Bad or Failing Exhaust Gas Recirculation (EGR) Valve. Common signs include engine performance issues like decreased power and acceleration, rough idle, and the Check Engine Light coming on.

Where is the IAC valve on a Silverado?

Also take a look at your IAC (Idle Air Control) valve, usually located on the side of the throttlebody. They are very easy to change out and tend to go bad. I had a similiar problem and replaced and cleaned may things, still had issue and got truck tuned with a slightly higher idle, as soon as I did it was golden.

Why does my Chevy Silverado not idle after a cold start?

My 89 Chevy Silverado would not idle after a cold start I took the PCV valve out and sprayed it with carburetor cleaner….no more problems!!! 5 people found this helpful. One of the MOST overlooked parts of these TBI engines is the distributor pickup coil.

What causes a Chevy C / K 1500 to drop in idle?

In order to change these, you have to completely removed the distributor and completely disassemble the distributor to get the pickup off and replace it. These components are very sensitive and when failing, will cause misfire, idle issues, and cause it to burn rich as well. 11 out of 12 issues like this are because of this pickup coil.

Why is my GMC Valev stalling at low rpm?

I had the IAC out and cleaned the valve and the port. the valev is not siezed and at idle there is no changes unless the ac pump cycles but is otherwise smooth and even. PCV seems to be fine with good vacuum at the valve and free motion of the valve.

Along with Silverado’s 2014 redesign came a 285-horsepower, 4.3-liter V6 with 305 ft-lbs of torque. For the first time in the Silverado’s history, the V6 is being offered across the entire 1500-series model range—with all three cab configurations, and all three bed lengths.

Are there 6 cylinder engines in pickup trucks?

A recent development in the pickup Truck segment is the emergence of the six-cylinder engine as a powerhouse. Sure, compact pickups have run them for years—those are the ‘big” engines in that class. But when you’re talking 1500-series trucks, most six-cylinder engines weren’t taken seriously at all. This is now history.

What causes low idle on a Chevy Silverado?

A dirty throttle body may cause a lower than normal idle and possible stalling condition. Performing a throttle body service will commonly correct this concern. The average cost for a Chevrolet Silverado 1500 General Diagnosis is between $88 -$111.

What kind of engine does a 2002 Chevy Silverado have?

A popular full-size pickup truck, the 2002 Chevrolet Silverado 1500 is offered with a regular or an extended cab and the choice between RWD and 4WD. Tougher than the standard 1500, the 2002 Chevrolet Silverado 1500HD is a full-size crew cab pickup truck that comes standard with a 300 hp 6.0L V8 engine.

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.

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 does my Chevy S-10 idle so bad?

Computer does show that it is in OPEN LOOP MODE and O2 Sensor shows RICH and while working the throttle and watching the code meter, the reading will move from RICH to LEAN and back to RICH again. While all of this has helped the engine somewhat, it still barely idles and it still lops really bad.

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 GMC Truck die at idle?

Once the engine is warmed up then it relies on the O2 sensor for air/fuel ratio. A rough idle usually means a vacuum leak. I would check for those especially vacuum lines.

What happens to your car when you idle?

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.

What causes a P0300 to misfire at idle?

Looks like the 2nd drive cycle is when it throws it’s codes. Let it idle for a minute, and it kicked back a P0300, random misfire. After saying a few choice words, I took a walk and picked up 6 new plugs and the socket, best case scenario, I’ll have some spare plugs and a coil pack for down the road.

What causes a Chevy 350 to backfire when 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.

Where is the idle button on a GM TBI?

The “A” and “B” terminals are located on the top right of the connector. Unplug the IAC valve located on the passenger side, rear of the throttle body. Start the engine. Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier.

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

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

When youre truck is just warming up, its still cold the efi is dumping fuel because its in like “Choke” mode. As it warms up, it leans the fuel air mix out to acomodate warm engine condition driving. So, when its idleing cold its got the fuel to compensate for the extra air leaking in.

Why does my check engine light light up when I idle?

This is primarily to make sure that the emission controls are working properly, but a rough idle can cause a malfunction code to be sent to the computer. If this happens, your “Check Engine” light on the dashboard will light up.

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.

What causes the Check Engine light to come on?

A failing ignition coil can create several symptoms: Check engine light comes on Engine runs poorly or stall Increased emissions Reduced fuel economy Car won’t start I… Read More When spark plugs fail, the engine will struggle. The check engine light will come on, and it may appear either solid or flashing.

What causes a diesel engine to have rough idling?

As diesel engines age, the fuel injection system can start to “gum up”, and the injector tips begin squirting instead of misting. The injection timing can get out of whack. Wear and tear on the piston rings and cylinder walls result in lost combustion. Is the smoke coming out of the exhaust pipe blue?

Why does my car have a rough start up?

The excess oil gets burnt and is emitted as blue smoke. This is a mechanical problem because engine oil should not be getting into places where it can be burned. In this case, the engine will usually experience a rough start-up, with the idle smoothing out after about 30 seconds.

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.

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 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.

What’s the misfire code on a 1998 Vortec?

Can someone please help with what I should check next, I have a 1998 Chevy K1500 5.7 Vortec with a misfire, P0300 code for 3 months. runs a little rough, while driving under normal conditions it sputters, hesitates, and also will backfire, under heavy acceleration no noticeable skip, no sputters, and does not hesitate or backfire.

How to help me with a Chevy k1500 misfire?

× Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

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.

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.

Can a weak alternator cause a rough idle?

I know that sounds kind of simple but sometimes a weak alternator can cause a rough idle. Although it would be weird for it to only do it when it is at operating temp. I would test for a draw in the electrical system if those both pass.

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.

What kind of engine does a 99 Silverado have?

I have a 99 silverado, 5.3 liter 4×4 137k miles. Runs great when engine is cold. After about 10-15 minutes of driving when engine warms up, engine bogs down, idles rough, and dies when throttle is applied. I ran the codes, had low voltage x4 oxygen sensors, and random misfires. I replaced the 02 sensors because I am well over 100k miles.

What happens when the engine warms up in a Silverado?

After about 10-15 minutes of driving when engine warms up, engine bogs down, idles rough, and dies when throttle is applied. I ran the codes, had low voltage x4 oxygen sensors, and random misfires. I replaced the 02 sensors because I am well over 100k miles.

What should the idle rate be on a 1997 GMC Truck?

Underdog, I don’t know the 1997 5.7, but 1000rpm sounds like a high idle, not where it should “bottom out”. A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine.

Why does my Chevy Silverado hesitate to take off?

My truck had a rough idle that varied it seemed depending on the weather so I figured I had a gasket leak. Then one day it starts bucking and hesitating on take off to the point it wasn’t driveable. Troubleshooting with the mechanic and we discovered this… Loading…

Are there any problems with the Chevy 4.8L Vortec?

The two engines tend to have similar problems, but the 4.8 Vortec comes in at a higher reliability rating on our scale due to its lack of AFM, which is known to cause problems on just about every engine it touches. 1. Intake Knock Sensor – 4.8L Vortec

Also take a look at your IAC (Idle Air Control) valve, usually located on the side of the throttlebody. They are very easy to change out and tend to go bad. I had a similiar problem and replaced and cleaned may things, still had issue and got truck tuned with a slightly higher idle, as soon as I did it was golden.

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.

What does low rpm mean on a GMC Truck?

Lower counts indicate that less air is commanded by the control module. This DTC is designed to detect low engine RPM that is not responding to increased IAC counts. AllOffTopic.com FTW!

What is the OBD2 code for a Chevy?

OBDII Chevrolet Code Definitions. Be sure to double check the codes. Anything P1000 to P1999 or P3000 to P3400 will be Manufacturer specific and may not match the ones listed here. Check specific manufacturer pages on the site, as some of them, we list the OBD2 codes on those pages for those specific vehicles.

Lower counts indicate that less air is commanded by the control module. This DTC is designed to detect low engine RPM that is not responding to increased IAC counts. AllOffTopic.com FTW!

What kind of engine does a Silverado Sierra have?

SilveradoSierra.com • Feels as if Truck is Missing while riding down road. : Vortec 5300 5.3L V8 Feels as if Truck is Missing while riding down road. My 2001 Silverado 1500 4×4 5.3 has 270xxx miles on it. It has had a Full tune up, new fuel pump, and fuel filter installed within last 5000 miles.

What kind of engine does a 1997 Silverado have?

Overview Overview Most Popular HD Silverado 2dr Extended C Engine Type Gas Transmission 5-speed manual Drive Type Rear wheel drive Cylinders V8

Why is my Silverado 5.3L V8 intermittent?

One other intermittent problem I’ve had since the day the fuel pump went out is it acts the fuel pump is loosing it’s prime, meaning when I go to start the engine I have to spin it over for a few seconds before it will fire up and even then it will sputter a bit and catch up.

Is there an increase in rpm on a Silverado?

I have sprayed carb cleaner all around the intake, throttle body and vacuum lines while it’s idling rough and did not get an increase in rpm.

What’s the idle RPM on a 1992 Chevy 350 TBI?

I have a 1992 Chevrolet K2500 350 tbi that idles high about 1200 to 1500 rpm sometime’s will idle about 800 rpm. When i first start the truck it slowly rises from 1000 to 1500 rpm then comes down after five minutes to 1000 rpm then when i drive it for a few minutes then it starts idling at 1100 rpm when the truck is in drive.

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.

Why does my Chevy truck shake at idle?

While the truck is idling with 02 lean, a quick shot of carb spray in the throttle body will cause the 02 to go rich. And when the truck sometimes starts shaking at idle it will smooth out with carb spray. I jst don’t understand why the computer is not trying to richen the mixture up based on the 02 saying lean.

I have a 1992 Chevrolet K2500 350 tbi that idles high about 1200 to 1500 rpm sometime’s will idle about 800 rpm. When i first start the truck it slowly rises from 1000 to 1500 rpm then comes down after five minutes to 1000 rpm then when i drive it for a few minutes then it starts idling at 1100 rpm when the truck is in drive.

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.

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.

Underdog, I don’t know the 1997 5.7, but 1000rpm sounds like a high idle, not where it should “bottom out”. A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine.

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?

What kind of engine does a Chevy truck have?

I love this truck, and I wanna fix it. Truck—95 ext 1500 5.7 2wd/auto. 295000mi. Eng/trans replaced @ 217k with GM crate350/SERTA 4L60

Why does my car not idle when it’s cold?

My car has an automatic transmission. Hi there – given your repairs already, I would suspect a fuel-related issue, specifically the engine coolant temperature sensor (for engine management, not the gauge). If a faulty temperature signal is sent to engine management, the engine may not be getting a rich enough mixture when cold.

What does idle air control code p0507 mean?

It is typically triggered when the engine idle speed is 200 rpm or more over the predetermined limit set by the manufacturer. It is a generic code, which means that it has the same for the Chevy Silverado as any other vehicle. Unlike many OBDII trouble codes, P0507 will typically be noticeable to you when driving.

What causes a p0507 code on a Chevy Silverado?

The Idle Air Control Valve is often not the cause of the code. Here are some of the most common causes of P0507 in the Chevy Silverado, as well as waist to troubleshoot them. Keep in mind that there are differences in model years.

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.

What causes a truck engine to miss at idle?

I put truck on a scanner and watched the cylinders. # 1 misfires at idle but quickly stops misfiring at around 1000 rpms. you can here the engine miss at idle but truck runs great on road . anyone else ever had this problem? You can’t post conmments that contain an email address.

SilveradoSierra.com • Feels as if Truck is Missing while riding down road. : Vortec 5300 5.3L V8 Feels as if Truck is Missing while riding down road. My 2001 Silverado 1500 4×4 5.3 has 270xxx miles on it. It has had a Full tune up, new fuel pump, and fuel filter installed within last 5000 miles.

What kind of engine does a 1999 Silverado have?

Problem vehicle, 1999 Chevrolet Silverado 1500 5.3L V8 2WD with 351,000mi. I’ve read numerous threads on the rough idle cold start and the engine having some sort of intake leak and I don’t believe I have this problem, but I could be wrong.

What’s the average idle speed of a Silverado?

In the last month, noticed that idle is lower than normal. In Park or Drive when stopped at a light, the idle gets pretty rough and stays around 300-400 or say and often stalls when turning a corner as well. Always have the A/c on as I’m in Florida. At speeds of 15 MPH up to highway speeds, all is good.

When does Chevy Impala engine hesitate during acceleration?

Chevrolet Impala Engine hesitates during acceleration Inspection at your home or office. Our certified mobile mechanics come to you 7 days a week between 7 AM and 9 PM.

Why does my Jeep Compass hesitate to accelerate?

An engine that is hesitating to accelerate is most likely dealing with a fuel/air mixture that is too lean. Engine’s that are running inefficiently will begin to show signs like hesitation which will only become worse over time. If you notice some symptoms like hesitation, you should have your vehicle inspected immediately.

Why is my Silverado Sierra sluggish to accelerate?

Have a KN intake system on it and keep it clean so I dont think that is it but I havent really done anything else as far as modifications. After accelerating it feels like it starts to let loose and eventually seems to get up to speed. Any ideas of what I can do? Get a custom tune. I would get an exhaust of some sort to help with the tune.

Why does my Vortec 5300 feel sluggish when I accelerate?

I have noticed that when I accelerate it feels a bit sluggish. Have a KN intake system on it and keep it clean so I dont think that is it but I havent really done anything else as far as modifications. After accelerating it feels like it starts to let loose and eventually seems to get up to speed.

What’s the problem with my Silverado 4.3 V6?

2007 Silverado 4.3 V6 -39,000 miles…no engine or tranny mods. No exhaust. I do have a K&N air filter that I just cleaned. I don’t think I have that MAF sensor on my intake like the more expensive trucks do. My problem seems to be a lack of power, like it just doesn’t want to go (V6 jokes aside).

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.

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.

How do I reset Transmission Control Module Chevy Silverado?

I have a 2001 Silverado. To reset my TCM I turn on the key to the on position press the gas pedal to the floor for 10 seconds and then turn the key off then release the gas pedal and wait about 5 minutes to restart the engine. I have a 1999 Chevy 1500 I rebuilt the transmission so when I put it in drive its like it take off in high gear.

Why is the transmission not shifting on my Chevy Silverado?

Take a couple of easy steps to see why your truck is not shifting. No need to panic yet. This article applies to the Chevrolet Silverado GMT800 (1999-2006). Your transmission is just supposed to shift and leave you alone.

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.

Can a Chevy Silverado go from 1st to 4th shift?

Transmission is in Limp Home Mode or has no electrical power. Also, PCM has lots of error codes. No 1st or 4th, shift 2nd to 3rd by itself when put in D or OD and locks converter: Goes into gear but sluggish like brakes are on, can manually shift to 2nd to get moving, then put in OD and truck shift 3rd as well as 4th are OK.

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

Loose torque converter-to-flywheel or flywheel-to-crankshaft bolts will sound similar to bearing knock. This condition produces several raps during quick acceleration on a free running engine. Depending on the idle smoothness, when the transaxle is in gear, the noise may or may not appear.

What’s the idle speed on a Silverado truck?

So my idle was somewhere between 1000-1500 rpms. I unplugged the battery for a few hours and it dropped to around 800-900. After about a week of “relearning” it was back down to 500-600. Oops… Sorry for the pointless post. ^Didn’t realize you had already figured it out.

Why does my help truck have high idle?

Help truck has 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. Connected the intake hose back in and it idles at 3000 rpms! It won’t go back down. I don’t know what to do. This is the first electrical engine I have had.

Why does my Silverado not Rev at 4000 rpm?

At 1500 RPM, it puts up 20-21 in-hg of vacuum. At 3000 RPM, it puts up ~18.5 in-hg of vacuum. It will not rev above 4000 rpm sitting in park!! If I apply more throttle, the revs will actually drop to 3800, as if a load were being applied by a dyno, and the engine will start to ping.

Help truck has 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. Connected the intake hose back in and it idles at 3000 rpms! It won’t go back down. I don’t know what to do. This is the first electrical engine I have had.

So my idle was somewhere between 1000-1500 rpms. I unplugged the battery for a few hours and it dropped to around 800-900. After about a week of “relearning” it was back down to 500-600. Oops… Sorry for the pointless post. ^Didn’t realize you had already figured it out.

What’s the fuel trim on a Chevy k1500?

With fuel trims what is of interest in the total fuel trim for each bank so taking the first results bank 1 seems to have a total fuel trim of around +23% and B2 around +8%. +23% is way above what is an acceptable fuel trim and indicates the computer is adding a huge ammount of fuel to counter a lean mixture.

What’s the RPM of a Chevy Silverado 6.0?

However, at idle, it runs rough, and at super-low RPM; usually 350-450 RPM. When it’s parked, the tach needle usually bounces from 350-500, and then levels out at 500. It drives perfect on at speed, plenty of power.

What to do if your fuel injector is rough idle?

Another option is to try to clean your fuel injectors with a fuel system additive like Techron, or something similar. While an additive may or may not have much effect on your rough idle problem, you can consider this as a last-ditch effort before visiting your mechanic. Follow the directions on the product’s label.

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 causes a Chevy 6.0 Vortec engine to leak?

They are subject to extremely high heat temperatures which can cause gaskets and bolts to warp and go bad, creating an exhaust leak. On the Chevy 6.0 vortec engine, the exhaust leak is most commonly caused by the exhaust manifold bolts completely breaking off. When the bolts break off, air gaps will open up causing exhaust gasses to escape.

When did the Chevy 6.0L Vortec 6000 come out?

The 6.0L Vortec “6000” engine was introduced in 1999 and remained in production until 2019 when it was replaced by the 6.2L Vortec. The Chevy 6.0 is a small-block V8 engine that produces 300hp-345hp and 360tq-380tq, depending on the engine version. The 6.0 engine had nine variations over its 20 year life span.

They are subject to extremely high heat temperatures which can cause gaskets and bolts to warp and go bad, creating an exhaust leak. On the Chevy 6.0 vortec engine, the exhaust leak is most commonly caused by the exhaust manifold bolts completely breaking off. When the bolts break off, air gaps will open up causing exhaust gasses to escape.

Is the Check Engine light on during rough idle?

At times, the check engine light will activate during the rough idle. Sometimes the light flashes and goes off after a half hour or so, and sometimes it will come on and stay on for as much as a day or two. The burb always runs fine after warming up, even if the light stays on.

What causes a Chevy Trailblazer to idle roughly?

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

What kind of engine does a 1992 Chevy truck have?

C3500 The 1992 Chevrolet C3500 truck featured a 5.7-liter V8 engine capable of producing 190 horsepower at 4,000 rpm. All models came standard with a five-speed manual transmission and a fuel tank that could hold a maximum of 34 gallons of gas.

How do you change the idle speed on a T-30?

Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM. Turn off the engine and disconnect the negative battery terminal from the battery using a wrench. Reconnect the IAC valve.

When did the Chevrolet small block engine come out?

(LT5) The Chevrolet small-block engine is a series of V8 automobile engines used in normal production by the Chevrolet division of General Motors between 1954 and 2003, using the same basic engine block.

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.

C3500 The 1992 Chevrolet C3500 truck featured a 5.7-liter V8 engine capable of producing 190 horsepower at 4,000 rpm. All models came standard with a five-speed manual transmission and a fuel tank that could hold a maximum of 34 gallons of gas.

When did the Chevy 5.7 liter engine come out?

Chevrolet put its 5.7-liter engine in several vehicles from 1988 through 1992. The Suburban, C/K3500 and the G30 vans all had options for the 5.7-liter.

Why is my C / K 1500 surging at idle?

TPS SENSOR BREAK INSIDE THESE THINGS AND CAUSE IRRATIC IDLE. THE IDLE AIR CONTROL IS ALSO NEXT TO IT PULL THAT AND ENSURE IT ISNT COVERED IN CARBON.IF IT IS CLEAN WITH CARB CLEANER

Why is my Duramax diesel engine not working?

The trucks computer keeps track of how much fuel needs to be added or subtracted from each individual cylinder to make the engine run smoothly, and this value is called the balance rate. If one cylinder is contributing too much or not as much as the rest, the cause is usually a bad injector and the cure is a replacement.

What causes a truck to stall at idle?

Cleaning and/or making an adjustment to the throttle body may correct the problem. Engine running at idle, plug the IAC passage, and the RPM (revolutions per minute) should be at or near 400 rpm. A vacuum leak present could also cause the engine idle to be improperly controlled and needs to be identified before any adjustments are made.

What causes a Chevy Silverado to stall at low speeds?

You might have a bad IAC valve. (idle air control valve) The PCM retracts the pintle in the valve constantly to maintain desired rpm idle, and rpm at low speeds. Its a 4 wire valve bolted on to the throttle body. If its a mechanical problem with the spring or pintle in the valve, it will not set a code for the IAC. If you decide to replace it.

What’s the RPM of a car when it idles?

When the car starts it idles fine at about 1000 RPM. As soon as it warms up, it starts to idle rough, between 500 and 750 RPM. It almost quits running. As soon as you give the car some gas it runs just fine.

What does rough idle mean on a car?

As soon as it warms up, it starts to idle rough, between 500 and 750 RPM. It almost quits running. As soon as you give the car some gas it runs just fine. About 3 weeks ago I got a “Engine Lean” check engine light error. I reset the system and have not gotten the error again. Since then I have: Ohmed out the air idle controller.

Truck recently had an exhaust manifold replaced. When its cold (as in first thing in the morning), it fires right up and high-idles for a few seconds and runs fine. After the first few seconds, its idles rough. The engine struggles to keep it above 7-800 RPM.

Why is my 7.4 Vortec rough idle leaking fuel?

Get a scanner on it and check the LTFT’s. If they’re pegged at +25 then the FP regulator is leaking. Very very common issue on the 7.4’s. If you don’t have scanner access connect a FP gauge, cycle the fuel pump a couple times and then watch the gauge for drop off.

When its cold (as in first thing in the morning), it fires right up and high-idles for a few seconds and runs fine. After the first few seconds, its idles rough. The engine struggles to keep it above 7-800 RPM. When its in gear at idle (like a stop light), it struggles to stay above 500 RPM, and will occasionally stall.

What are the symptoms of Vortec drivability issues?

The symptoms include a very rich running condition, a rough idle only in park or neutral, and the scanner shows a more rich condition on bank 2, and upon acceleration or any application of the gas pedal my bank 1 knock sensor is retarding timing by 6-7 degrees and 3-4 degrees when cruising.

How big is a 7.4 liter Vortec engine?

7.4 Vortec Engine Specs. by Vern Hee. The 7.4-liter engine is known as the General Motors 7400, which was a Vortec-designated engine built from 1996 until 2001 as a truck engine. Vortec technology was first introduced by GM in 1986 in a V-6, 4.3-liter engine called the 4300.

It appeared in the Chevy Silverado, GMC Sierra, Chevrolet Suburban and the Chevrolet Express. All the GM products in 1996 were applauded by the public because of the new line of power trains that increased horsepower. The 7.4-liter, 7400 454-cubic inch engine provided the same 290 horsepower across the board for all GM products.

Is it hard to start a Vortec rough idle?

On any start after the initial cold start in the morning, it is hard starting. You have to feather the gas a little and it shudders but it will start then you have to give it a little gas or it’ll stall. Driving, its fine as long as you are moving.

Why does my GMC engine start but not run?

Repair guides and support for cars, trucks, and SUVs manufactured by GMC. Answered! View the answer I have this problem too Is this a good question? An engine will start but not run when the fuel runs out .

Why does my Chevy Silverado run so lean?

Of all the sensors equipped in your vehicle, the O2 sensors may have it the hardest. They deal with super hot exhaust that can cover them in deposits that can leave them ineffective. The heat of the exhaust can also bake the wiring going to/from them over time. If an oxygen sensor goes bad, it can make your Silverado run too lean (or rich).

How can you tell if your car has a rough idle?

Share it! 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. There can be a variety of reasons why your vehicle is idling roughly.

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.

On any start after the initial cold start in the morning, it is hard starting. You have to feather the gas a little and it shudders but it will start then you have to give it a little gas or it’ll stall. Driving, its fine as long as you are moving.

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.

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.

While the truck is idling with 02 lean, a quick shot of carb spray in the throttle body will cause the 02 to go rich. And when the truck sometimes starts shaking at idle it will smooth out with carb spray. I jst don’t understand why the computer is not trying to richen the mixture up based on the 02 saying lean.

One other intermittent problem I’ve had since the day the fuel pump went out is it acts the fuel pump is loosing it’s prime, meaning when I go to start the engine I have to spin it over for a few seconds before it will fire up and even then it will sputter a bit and catch up.

Problem vehicle, 1999 Chevrolet Silverado 1500 5.3L V8 2WD with 351,000mi. I’ve read numerous threads on the rough idle cold start and the engine having some sort of intake leak and I don’t believe I have this problem, but I could be wrong.

The oxygen sensors that are equipped in your Chevy Silverado are responsible for monitoring the exhaust to help the ECU determine the correct air/fuel mixture. Of all the sensors equipped in your vehicle, the O2 sensors may have it the hardest.

Are there any problems with the Chevy 6.0 engine?

If you are a user of Chevrolet 6.0 Vortec Engine, you must have the ideas of common Chevy 6.0 Engine Problems. In any vehicle, the engine is regarded as the most essential component. The Chevy 6.0 engine, similar to any other component, might develop some technical problems – which can make owners look for ways on how to fix them.

Why does my GMC Truck die at idle when warm?

So I wasn’t suspicious of fuel pressure, then later checked it and I have a steady 10psi from the moment I turn the key until a few seconds after it dies so the fuel pump is good. It runs strong and is fine until I idle. This happens only when the engine is warm and last time I checked it never went into closed loop.

Why does my Chevy Silverado not want to accelerate?

If the catalytic converter gets too clogged up, it’ll keep the motor from accelerating properly. It’ll “bog” after a certain speed. Maybe it’ll drive 20 miles an hour just fine, but after that it just doesn’t want to accelerate whatsoever. This can also be a sign that it’s not getting enough fuel as well.

Why is my GMC Sierra 1500 stalling and dying?

There is no code given. Have changed the injectors, timing, fuel tank, fuel pump, fuel pump, map sensor, cooling temp sensor on front of block, rebuilt the tbi, air idea valve. None of this hasite helped. The truck starts and dies. Have to give a little gas to keep running. While driving have to 2 foot it so it won’t die.

What causes a Chevy Silverado 350 to hesitate?

The two most common causes of hesitation on these vehicles are Throttle position sensor and MAP sensors. Both can be checked with a lab scope, but aon a truck this old you have to weigh whether the money is better spent on two new components rather than testing costs.

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.

What should I do about my 1994 Chevy Silverado?

My 94 Chevy Silverado was also sputtering, backfiring, missing etc… I changed the fuel filter to no avail, tried several things to get it to run smooth but nothing helped’ until a friend of mine who used to have his own shop told me about a memo he had received years ago dealing with this identical problem. here’s what worked for me!

What kind of engine does a 1995 Chevy Silverado have?

My 1995 Chevy k1500 Silverado 350 V8 stumbles and hesitates when i take off from a stop, it idles fine and runs fine My 1995 Chevy k1500 Silverado 350 V8 stumbles and hesitates when i take off from a stop, it idles fine and runs fine – Answered by a verified Chevy Mechanic

What’s the problem with my 1997 Chevy Silverado?

I have a 1997 chevy 1500 siverado with a 5.7 vortec that has been having a problem for about 6 months now. The truck starts, idles, and revs normally and when accellarating slowly everything works just fine, but once you get past half throttle it falls on its face and acts like it has a clogged fuel filter or bad fuel pump.

What causes a soft brake pedal on a Chevy?

Soft or Spongy Brake Pedal: Too much air in the system due to improper bleeding is usually the cause of this problem. However, it can also be due to fluid loss or a low fluid level. Bleed the brake lines as recommended by Chevy to fix this. You could also have a ballooning brake hose when the brakes are applied.

There is no code given. Have changed the injectors, timing, fuel tank, fuel pump, fuel pump, map sensor, cooling temp sensor on front of block, rebuilt the tbi, air idea valve. None of this hasite helped. The truck starts and dies. Have to give a little gas to keep running. While driving have to 2 foot it so it won’t die.

What does a GMC Sierra 1500 idle like?

Today experienced a poping sound almost like a backfire from underneath. After the truck starts and is warm at a stable idle in park/neutral it’ll rev up fine. But the stable idle won’t last long, it’ll idle low and rough. Mpg has decreased drastically and give off a rich smell when running.

What does the fuel smell like in a GMC Sierra 1500?

If so pull the air filter off and sniff the throttle body for a fuel smell. If the diaphragm has ruptured it will literally be like putting a hose with fuel into the intake and running it full.

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 Chevy Silverado not accelerate at high RPMs?

If your Silverado won’t accelerate, but the RPM’s go up it’s usually not going to be an engine related issue. Somehow, the power that your engine is creating is not making it to the rear wheels. This is typically a transmission related issue. Here are the most common cause of acceleration with the RPM’s going up: 1. Transmission Fluid Low

Keep reading to find at least one possible answer to “Why is my Chevy Silverado losing power?” Read More: How Can You Tell If Your Pickup Is Overloaded? If your GM truck occasionally loses the ability to accelerate and warns you of reduced engine power, that could be caused by a faulty throttle body.

What makes a Chevy Silverado hard to start?

Even 2-3 lbs. less can cause this concern. This 5.3 engine is also known for the intake manifold gaskets leaking vacuum. This causes a hard start and also high idle in cold ambient temperatures, as well as hesitation off idle and unstable idle when engine hot.

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.

What’s the Check Engine light on my Silverado?

Hello all I have a 2009 Silverado 1500 LT 5.3 with 93K and she’s been acting up the last couple of weeks. The check engine light came on throwing code p0305 which is a misfire in cylinder 5.

The engine may be running too lean, due to a leaking intake manifold. Too lean means too much air and not enough fuel; according to the power control module (PCM) calculation. When the engine is cold, not all sensors function. As the engine warms up the oxygen sensors report the lean condition.

What causes poor fuel delivery on an old car?

Before looking at the fuel pump, make sure there is gasoline in the tank.Another reason for poor fuel delivery on older vehicles is a pinhole leak in the fuel line. A good place to start would be to check the neoprene hose connector between the tank outlet and the fuel line.

What causes a vacuum leak in an intake manifold?

A very common cause of a leaking intake manifold is the gaskets and bolts used from the factory. As a result, the plastic intake manifold fails to seal and creates a vacuum leak. General motors now blames the intake manifold gaskets as the problem and now sells a redesigned replacement. A stored DTC P0300.

How is rough idle solved for GM trucks?

From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. Rough Idle Solved! Posting my results in hopes it will help someone else down the road.

What makes a 95 TBI Chevy run crappy?

2–EGR….did you use the VIN # and go to the dealer for the correct one? to test it ,disconnect the vacuum line and plug it and go for a ride. 3–When I removed the cat on mine ,the 02 sensor set the check engine light on and was going thru more gas but didn’t run crappy.

When did my 95 TBI Chevy stop running?

Timeline and service related incidents— Little over a year ago, it quit a couple times—I mean locked down like the key was switched off. My local indie tech replaced the distributor (O’Reilly’s).

Why is my Chevy Vortec 4300 V6 leaking fuel?

In the L35 and LF6 engines, the spider injectors are known to leak at the pressure regulator and at the supply and return lines due to a design fault. Outside of leaking fuel onto the exterior of the engine itself, it can cause excess fuel to get sucked into the engine.

What causes hesitation and stumbling in a 1990 Chevy c1500?

An expert that got 10 achievements. Re: 1990 chevy c1500 hesitation and stumbling during… Based on what you said, I would say the engine is starving for fuel. The computer has to be disabled to set timing – there should be a procedure for that. I would start with checking fuel pressure at the throttle body.

Why does my Chevy c1500 not start up?

SOURCE: No fuel to the injectors on a 1997 Chevy c1500. can be the distributor or maybe the fuel pump let the truck sit and then turn key almost on but not enough to initiate start up and see if you hear pump in the gas tank and if thats not it, it could very well be your distributor it might be moist in the cap or button area

Why does my Chevy silveraor run a little lean?

Sometimes as the miles accumulate and a little varnish builds up in them one or two cylinders will start to run a little lean.

What kind of idle does a Chevy silveraor have?

Misfire – Rough Idle: Hi, I Have 2009 Chevy Silveraor with About Hi, I have 2009 Chevy Silveraor with about 88,000 kms. Purchased the truck in December and have been having rough idle conditions and what feels to be misfiring (on morning start up, sitting at lights I can feel it, and during the daytime if it has sat for a couple hours).

Is there a removable chip on a 1997 Chevy Silverado?

There is no removable chip on a ’97 PCM. The computer can be reflashed (reprogrammed) with updated software if you have the equipment. Generally, a reflash will not rectify a situation that arose so late in the truck’s life.

Sometimes as the miles accumulate and a little varnish builds up in them one or two cylinders will start to run a little lean.

Why does my Silverado go slower past half Trottle?

The truck starts, idles, and revs normally and when accellarating slowly everything works just fine, but once you get past half throttle it falls on its face and acts like it has a clogged fuel filter or bad fuel pump. It actually goes slower than below half throttle. The bogging gets consistently worse the more throttle you give it.

Chevy 6.0L TPS Failure Symptoms 1 Rough idling, stalls at idle, jumping RPM’s 2 Lack of power, acceleration, etc. 3 Engine misfires 4 Irregular shifting

What kind of engine does a Chevy 6.0 have?

The Chevy 6.0 is a small-block V8 engine that produces 300hp-345hp and 360tq-380tq, depending on the engine version. The 6.0 engine had nine variations over its 20 year life span.

The Chevy 6.0 is a small-block V8 engine that produces 300hp-345hp and 360tq-380tq, depending on the engine version. The 6.0 engine had nine variations over its 20 year life span.

What causes a Chevy 6.0 Vortec engine failure?

1. Throttle body sensor failure – Chevy 6.0 The throttle position sensor (TPS) is located on the throttle body and is responsible for controlling air flow into the engine. The TPS sensor monitors how open the throttle is (ie. how much air is entering the engine) and relays the information back to the ECU.

Why does my Chevy Silverado not go over 25 miles an hour?

If so then remove the 2 closest to the engine, they are almost touching the manifold. If that helps then there is a blockage in the exhaust. Most likely a bad catalytic converter or a bent pipe. If the converter is bad make sure its replaced with a proper OBD 2 cat, otherwise you will be going through this in 6-18 months from now.

What should the idle speed be on a GMC V8?

A V8 should idle at 500rpm. GoNDown, did you recently disconnect your battery? After I left mine dead in the yard for a while and didn’t charge it, when I started it up it ran like you describe for a few days and then it was fine. I think it was doing a crank relearn (I no longer remember why I came up with that theory, though).

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.

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.

Why is my car idling on the side of the road?

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.

Why does the Check Engine light come on after filling the tank?

Overfilling the tank can spill fuel into into tiny vacuum lines and filters, which in turn can clog emission devices (like the “evap canister”. Soaking these devices in gasoline will cause the “check engine” light to come on. Replacing the damaged parts could be costly, but the time spent diagnosing the problem could be even costlier.

When does the Check Engine light turn off?

Chevy Camaro 2015 70k miles. I fill the tank up and by the second or third time I turn on the car the check engine light disappears. By the time the gas tank goes down to about 3/4 tank then it the check engine light comes back on. I took it to arnie bauer’s GMC and the first day I brought it in the code was o2 sensor running lean.

Why does my Chevy Equinox stall at idle?

The first is that by limiting the amount of torque when you push the gas pedal for a second or two, the engineers at GM were able to increase engine life by reducing the stress on it during takeoff. The second is improved fuel economy. When the throttle position sensor fails, it defaults to idle speed.

Can a bad gas tank cause a car to stall?

Bad gas can cause an engine to stall out. Water in the gas tank can also cause gas to be bad. If there were no other symptoms and suddenly you find that the vehicle is running very rough, bad gas could certainly be the problem. Here’s a good article on all the symptoms of bad gas.

What causes a fuel tank to clog in an old car?

Both the government and the insurance industry have extensively tested sugar contamination of fuel tanks and all it does is clog the fuel system. Styrofoam also will clog fuel systems. Many older cars have a drain plug at the bottom of the fuel tank.

Thanks. Quite a few items can cause a misfire condition in your vehicle. Usually worn spark plugs are the most common cause, so they are usually replaced first before diagnosis can proceed any further.

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 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

In the L35 and LF6 engines, the spider injectors are known to leak at the pressure regulator and at the supply and return lines due to a design fault. Outside of leaking fuel onto the exterior of the engine itself, it can cause excess fuel to get sucked into the engine.

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 to do when your Chevy Silverado won’t start?

13 people found this helpful. My 2004 Silverado won’t start when it’s rainy so I sprayed the heck outta the wires and cap with wd40 it started right up ran till it rained 2 weeks later now just starts I can hear the fuel pump running but it dies after about 40 secs dies then will not start till it sits for about ab hour any suggestions

In order to change these, you have to completely removed the distributor and completely disassemble the distributor to get the pickup off and replace it. These components are very sensitive and when failing, will cause misfire, idle issues, and cause it to burn rich as well. 11 out of 12 issues like this are because of this pickup coil.

Why is my Chevy Silverado engine stalling out?

When it asks for a lot of fuel, instead of taking off, it stalls out with the demand. This can be caused by the fuel pump or fuel filter. If your Chevy Silverado’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:

What causes a rough idle on an air conditioner?

A clogged air filter will not allow clean air to pass through causing a rough idle. To remedy the situation, have your air filter replaced with a new one and also have the housing serviced to clean any dirt buildup. 7. Dirty Oxygen Sensor

What causes a car engine to stop running at idle?

Excess carbon build up can cause the EGR valve to stick open allowing intake pressures to drop and the engine to stall at idle and run rough. Burning to much fuel will cause the spark plug to carbon foul causing the engine to stop running. Once the issue has been rectified the old spark plugs must be removed and new ones installed.

When does rough idle occur in a truck?

I have a rough idle situation that occurs only when the engine is at operating temp. Putting the truck in neutral does not help meaning it’s probably not something with the torque converter/transmission. 1. New Bosch Iridium spark plugs gapped to pre-gapped 2. Brand new ACDelco plug wires. The actual OEM ones, not the 3rd party set being rebadged

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.

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 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.

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.

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 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 should I replace on my 1998 Chevy k1500?

Here is what has been replaced to try and stop this misfire: spark plugs, spark plug wires twice, distributor cap twice, rotor, ignition coil, EGR, CTS on intake manifold, coolant temp gauge sender, fuel filter, fuel pump, MAF sensor, oil change.

Today experienced a poping sound almost like a backfire from underneath. After the truck starts and is warm at a stable idle in park/neutral it’ll rev up fine. But the stable idle won’t last long, it’ll idle low and rough. Mpg has decreased drastically and give off a rich smell when running.

How much does a Chevy Silverado engine hesitate?

Chevrolet Silverado 1500 Engine hesitates during acceleration Inspection costs $85 on average. Real customer reviews from Chevrolet owners like you. Great experience. Oscar was very detail oriented with the service. Very Friendly and Knowledgable. David did a great job.

Chevrolet Silverado 1500 Engine hesitates during acceleration Inspection costs $85 on average. Real customer reviews from Chevrolet owners like you. Great experience. Oscar was very detail oriented with the service. Very Friendly and Knowledgable. David did a great job.

What causes a car to have rough idle and misfire?

Ignition systems, including spark plugs, plug wires, ignition coils, and ignition timing are major players, as are lean air/fuel mixtures and mechanical issues within your engine. Worn piston ring, worn or broken valves, and worn cylinder walls, as well as worn cam lobes may contribute to the problem.

What should I do about my Chevy 5.3 liter engine?

CFMtech, Extreme EFI, and Megasquirt have all came to the conclusion that a new properly oiled filter works very well. After on average 1500K miles ‘highway’ time (not offroad) the filter plugs and needs to be serviced (cleaned and oiled).

Why is my Chevy 5.3 liter engine surging but no code?

I figured out how to induce it by letting off the gas and quickly giving it 1/4 throttle and about half the time this will cause the engine to surge. But it will not a throw a code and is beginning to drive me crazy. any help is greatly appreciated.

What causes a Chevy Silverado engine to surge?

My 1999 silverado with the 5.3 engine. the motor will occasionally surge at crusing speeds between 40 and 60 mph. I figured out how to induce it by letting off the gas and quickly giving it 1/4 throttle and about half the time this will cause the engine to surge.

What causes a Chevy Silverado to refuse to start?

A failing or bad battery, as well as loose connections can wreak havoc with the truck’s electrical system. Possible symptoms include power locks locking and unlocking on their own, dashboard lights flickering, as well as the radio turning on and off. Some trucks may have a hard start, or will refuse to start again after being parked and shut off.

What kind of problems can a Chevy Silverado have?

Bad Battery/Battery Connections. A failing or bad battery, as well as loose connections can wreak havoc with the truck’s electrical system. Possible symptoms include power locks locking and unlocking on their own, dashboard lights flickering, as well as the radio turning on and off.

What should I do if my Silverado engine dies?

Update as of today: 1) the truck hasn’t started and kept running since last week. It only starts right up, then dies immediately. 2) I got a fuel pressure tester and the pressure is at 53 with key on, and maintains pressure when it starts (then dies).

What kind of engine does a 2003 Silverado have?

Here’s the kicker…..I put the new one in and the truck started right up and we thought it was fixed, my son drove the truck and it ran fine, but when he returned home, it wouldn’t keep running after he would try to start it again, no matter how many times we tried.

I have had a couple weird misfire issues in the past from a cam lobe starting to go down. most recently a couple weeks ago on a 07 tahoe with a 5.3l, I went down the same road you have been going down, finally found it by taking the valve cover off and running the engine.

Why does my Chevy Silverado not transfer power?

If your Silverado is too low on transmission fluid, it’ll will no longer be able to transfer power to the rear wheels. The power goes to the torque converter, and that’s the end of the line. You should check the transmission fluid immediately.

Why does my Silverado Sierra jerk at high speeds?

If you hammer it down, the truck smooths out. It appears to only happen durring light acceleration and at higher speeds. The best I can do to explain the jerking is that it feels as if is missing or being starved for fuel and about to run out. There are no check engine lights on in the truck.

Why does my Silverado Sierra feel like its missing something?

Most quality Scan tools will read misfire counters on newer GM products. Need to pin point what cyl is misfiring if at all. Another quick check since its at freeway cruise speed is to drag your foot on the brake just enough to unlock the torque converter. If the miss felling goes away it could be the torque conveter locking and unlocking.

What kind of acceleration does a Silverado Sierra have?

Durring light acceleration and at low speeds (city driving 35 mph or so) the truck seeems to run fine. However, when accelerating to highway speeds you notice that the truck will intermitantly jerk. In addition when crusing at highway speeds it runs fine, but anytime you have to lightly accelerate up a hill or something it starts again.

What kind of engine does a Silverado 5.3 have?

I recently bought a 2008 Silverado 5.3 with 77k on it. After a couple weeks I noticed that at idle the engine would stumble and my rpms would drop slightly. It eventually set off the check engine light with cylinder 1 misfire and random cylinder misfire. A couple days later the light went off but the issues remain.

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 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.

Why does my Silverado Sierra engine keep stalling?

I think you have water in the fuel. Whenever I remove a fuel filter, I dump the contents onto a bench or glass jar and look at it. Remove a fuel line and get a fuel sample. It could also be a IAC issue or a gummed up throttle body. Might try and clean the throttle body and iac.

How to reset the baseline idle speed in a GM TBI?

Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM. Turn off the engine and disconnect the negative battery terminal from the battery using a wrench. Reconnect the IAC valve. Reinstall the air cleaner and remove the paper clip from the ALDL connector. Reconnect the battery terminal after 5 minutes and test drive the vehicle.

Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM. Turn off the engine and disconnect the negative battery terminal from the battery using a wrench. Reconnect the IAC valve.

How does idle air control work in a GM TBI?

The air gap between the throttle body and the throttle plate is calibrated to allow enough air to pass by it for the engine to run at base idle speed. The IAC (Idle Air Control) valve utilizes the on-board computer to fine tune the idle speed according to engine conditions.

What kind of truck is a 90 Chevy?

I have a 90 Chevy 2500 , 5.7. The truck runs fine when it is warm, but when it is cold it runs rough, rich and stalls . I have changed the idle air valve, the TPS, and the thermostat sensor without any results. Also, I have taken the truck to the dealer for a diagnostic check.

What are the problems with a 1990 Chevy c1500?

Unresponsive to gas peddle at times and has major dead spots. not sure if its the injectors or the timing or if i need a tps sensor Clicking this will make more experts see the question and we will remind you when it gets answered. problems so far: injectors shot turck was pissing gas the second the lines pressurized. 2. TPS code 22 low voltage 3.

I have a 90 Chevy 2500 , 5.7. The truck runs fine when it is warm, but when it is cold it runs rough, rich and stalls . I have changed the idle air valve, the TPS, and the thermostat sensor without any results. Also, I have taken the truck to the dealer for a diagnostic check.

Why does the EGR only run rough when cold?

As for why it only runs rough when cold Im not 100% sure on that. The EGR can get clogged after a lot of miles on a car. It might be that there is thick sludge in there and when its cold its not allowing much recirculated air through. But really not sure. Now accepting bribes.

How often does a 94 S-10 4.3 drop rpm?

After you take it out and drive it, it’ll idle fine for a couple minutes, then will drop a couple hundred rpms every 30 seconds or so for just a count, then back to normal. Any ideas? I’m pulling my hair out.

Is the GMC Silverado 5.3 L doing the same thing?

Same thing happening to my 2008 gmc series 5.3l, I’ve changed the plugs wires throttle body sensor map sensor, done throwing parts at it 5 people found this helpful. My 2007 was doing the same thing. Seemed to run ok at idle with feeling a slight misfire. When I put it under a load, all kinds of things went wrong.

I pulled out the O2 sensor in front of the cat on the passenger side and left the hole open and the O2 sensor plugged in. Made all of the difference. Drilled a 1-1/4 in hole into the back of the cat and hogged it out. Come to find out the cat was clogged and putting back pressure into the exhaust valves. This caused lots of issues.

Your Chevrolet Silverado engine gives you the strength and durability a pickup truck needs with a fuel efficiency that goes easy on your wallet. When your engine starts steaming or knocking, you know you have a problem that needs fixing. AutoZone has what you need when looking for quality Silverado replacement engines.

Is the 3L Vortec engine a LS engine?

With its concept coming from the LS engine platform, the 3L Vortec is not technically a LS engine. In fact, the engine went through two different stages, during production- those included the Gen III and Gen IV.

What is the TBI code on a 1990 Chevy truck?

Consult a service manual or see below for any check engine light code definitions. You can use a late 80’s or early 90’s GM TBI definition. If you have access to a scan tool use a hook up for a 1990 350 cu. in. 5.7L Chevrolet truck. For some scan tools enter VIN 10th“L” 3rd“C” 8th“K”.

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.

Why does my Chevy Malibu start then stall?

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.

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.

When does a Chevy silveraor misfire at idle?

When parked at idle there is a noticeable light misfire. When parked in gear there is an aggressive misfire and occasionally when accelerating from a stop it will almost act like it is loading up. Tested ignition coils, new plugs.

The core symptom of a misfire is rough idle. This isn’t the only symptom that your GM van, pickup or SUV might experience… here are some more that you might see: P0300: Random Cylinder Misfire. P0301: Cylinder #1 Misfire.

When parked at idle there is a noticeable light misfire. When parked in gear there is an aggressive misfire and occasionally when accelerating from a stop it will almost act like it is loading up. Tested ignition coils, new plugs.

An expert that got 10 achievements. Re: 1990 chevy c1500 hesitation and stumbling during… Based on what you said, I would say the engine is starving for fuel. The computer has to be disabled to set timing – there should be a procedure for that. I would start with checking fuel pressure at the throttle body.

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.

Is the 1990 Chevy k1500 5.7 stalling?

I have a 1990 K1500 pickup with the 5.7L engine that I use as a second vehicle and for hauling. It doesn’t get driven every day and usually it’s only used for short trips but now has a stalling problem that I need to figure out.

I have a 1990 K1500 pickup with the 5.7L engine that I use as a second vehicle and for hauling. It doesn’t get driven every day and usually it’s only used for short trips but now has a stalling problem that I need to figure out.

I put truck on a scanner and watched the cylinders. # 1 misfires at idle but quickly stops misfiring at around 1000 rpms. you can here the engine miss at idle but truck runs great on road . anyone else ever had this problem? You can’t post conmments that contain an email address.

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.

When was the Chevy 307 engine taken off the market?

After 1973 the 307 was chopped from the GM line engine lineup. One interesting fact regarding the Chevy 307 V8 was that it was also manufactured by GM for boat use and sold by the Outboard Marine Corporation as a high performance marine engine.

After 1973 the 307 was chopped from the GM line engine lineup. One interesting fact regarding the Chevy 307 V8 was that it was also manufactured by GM for boat use and sold by the Outboard Marine Corporation as a high performance marine engine.

Is there a way to make Chevy 307 more horsepower?

Of course, there are ways to make more horsepower by revving this smaller engine higher and by using big-port heads, but that does not fit within our goal of a mild, affordable street engine. With the physics established, the 307 will respond to all the same techniques that work on any engine to improve performance.

What is the oil pressure on a Chevy 307?

Oil Pressure and Spark Plugs The Chevy 307 V-8 has an oil pressure range of 30 to 45 pounds per square inch (psi). The engine has AC-R45S-type spark plugs with a 0.035 gap.

What causes a caravan to run rough at idle?

Really, your Caravan 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 Caravan happens to have them, they can go bad and cause a rough idle.

Are there any problems with the LLY Duramax?

In terms of LLY injector problems, GM had sorted out the internal failures with the 2004 ½ redesign, but the LLY Duramax would occasionally exhibit a trouble code for the injectors, but in most cases it turned out to be an issue with the injector harness rubbing through and causing a short or open in the wiring.

How many versions of the Duramax diesel engine are there?

All told, there are six different iterations of the Duramax diesel engine: LB7, LLY, LBZ, LMM, LML, and L5P spanning from 2001 to the present day. Each version of the engine has its own issues and quirks, and some are less problematic than others.

When does a Dodge Ram idle or stall?

Dodge Ram stalls or idles rough refers to when the Dodge Ram idles erratically, and in some cases, stops running as a result. This video details the 8 reasons why a Dodge Ram truck will idle rough or stall. The information in this video is specific to the 2001 2002 2003 2004 3005 2006 2007 and 2008 Dodge Ram 1500 2500 and 3500 models.

Dodge Ram stalls or idles rough refers to when the Dodge Ram idles erratically, and in some cases, stops running as a result. This video details the 8 reasons why a Dodge Ram truck will idle rough or stall. The information in this video is specific to the 2001 2002 2003 2004 3005 2006 2007 and 2008 Dodge Ram 1500 2500 and 3500 models.

What does it mean when your car is idling but not running?

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.

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.

What causes the idle speed to randomly fluctuate?

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.

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.

Why is my car running rough while driving?

A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate. If the damage is bad enough, you may also notice your engine running rough while driving.

A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate. If the damage is bad enough, you may also notice your engine running rough while driving.

What causes the oil pressure to drop when running rough?

The oil pressure is around 40 typically and will drop when it’s running rough and also get up to 60 during revving of the engine. I suspected that it could be oil pump originally, thinking that maybe at a lower oil level the pump isn’t lubricating the engine properly, creating friction, causing the engine to lag, etc.

Why is my Ford engine stumbling at idle?

Weak or worn spark plugs, weak coil, dirty injector, and so on. It can be issue with IAC ( idle air control valve) causing the problem. There are many other possibilities causing these idle issues. Engine idles rough. There are few help links with solutions to troubleshoot such idle issues.

What to do if your Ford Focus runs rough at idle?

The fix is to seal the DPFE sensor so water cannot get in, but the way you do this will vary depending on whether the sensor is mounted on the firewall or is a tube-mounted DPFE. Remove the DPFE. Fold the insulation on the partition wall downward so it lays over the top of the EVR.

How to fix low idle or fluctuating idle Ford?

Ford has issued a service bulletin #10-21-6 to address a problem a low idle or fluctuating idle on the vehicles listed below. If your vehicle matches the model year and build dates listed below, Ford recommends installing a new throttle body to correct the problem.

Is it normal to have a rough engine idle?

Consequently, rough engine idle, is not a normal operating condition. As a result, there can be a variety of reasons for a, rough engine idle. It is best to try to diagnose and fix a rough engine idle; before it gets worse and before it gets expensive!

How much does it cost to replace low rough idle?

Re: LOW ROUGH IDLE, Sometimes dies! Costs around 50 to 60 bucks and takes about 5 minutes to replace. You can try cleaning it out but I would recommend replacing it. Its on the air intake right at the top of the motor. It has two bolts holding it on. I just replaced mine on my 07 3.0 with only 38k miles on it.

What causes a car to idle at low compression?

Exhaust and Intake Valves can be a big problem if they are carboned up. This can cause lower compression as the valve might stick open. A rough engine idle can be caused by spark plugs or wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber.

What to do if your outboard engine is running rough?

If it isn’t, it will cause your engine to become fuel starved, run rough, and eventually stall. Simply twist it open and monitor your engine for improvement. If your outboard motor isn’t running at its best, check the fuel vent on your portable tank to make sure it’s open.

What kind of car runs rough when engine is warm?

Runs Rough When Engine Is Warm: I Have a 99 Silverado, 5.3 Liter I have a 99 silverado, 5.3 liter 4×4 137k miles. Runs great when engine is cold. After about 10-15 minutes of driving when engine warms up, engine bogs down, idles rough, and dies when throttle is applied. I ran the codes, had low voltage x4 oxygen sensors, and random misfires.

When is the best idle time for a truck?

Rough idle when in drive..but idle is fine when in nuetra… Truck idle is rough when in drive with no acceleration (stop signs, red lights, traffic) but idle is fine when in park or nuetral. . Check engine light just started flashing recently

Why does my car idle when it’s cold?

An engine that is doing a rough idle when cold can also be the result of faulty spark plugs or damaged spark plug wires. Spark plugs use the electrical current produced from the ignition coils to ignite the correct ratio of the air to fuel mixture within the combustion chamber in the engine.

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 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.

Are there any problems with the Duramax diesel engine?

Overheating issues with the Duramax diesel seems to be a hit-or-miss problem; some owners experience it, while others never will. Regardless, it’s more common with the Duramax than other engines.

Are there any problems with the Duramax water pump?

This seems to be inherent of the factory water pump design. Overheating issues with the Duramax diesel seems to be a hit-or-miss problem; some owners experience it, while others never will. Regardless, it’s more common with the Duramax than other engines.

Are there any concerns about the aluminum cylinder heads on the Duramax?

The truth of the matter is that there are no concerns regarding the aluminum cylinder heads on any generation of the 6.6L Duramax. With over 1,000,000 Duramax engines on the road today, the aluminum cylinder head design has yet to be identified (with any credibility) as an inherent problem for Duramax owners.

How does the idle relearn procedure work on a Chevy?

Function An idle relearn procedure is a way to reprogram the vehicle’s computer memory to idle at a specified RPM, or revolutions per minute. Without the programmed idle, the vehicle can run arbitrarily, resulting in unnecessary engine wear. Chevy uses a simple idle relearn process.

What kind of truck is a 2001 GMC Sierra?

I have a 2001 GMC Sierra 1500 SLT 5.3l that I bought used with only 80k miles on it. This truck starts then immediately stalls. Here is a list of things that I have replaced to no avail.

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.

Function An idle relearn procedure is a way to reprogram the vehicle’s computer memory to idle at a specified RPM, or revolutions per minute. Without the programmed idle, the vehicle can run arbitrarily, resulting in unnecessary engine wear. Chevy uses a simple idle relearn process.

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.

What to do if your Vortec won’t start?

96 Chevy C1500 5.7L Vortec Truck won’t start, Replaced Fuel Pump, Filter & Has Spark. Hey everyone, I have a 1996 Chevy C1500 with a 5.7L Vortec, I got the truck recently and was told it just needed a Fuel pump, I replaced the Fuel pump, and the Filter, also the pump turns on and there is fuel up at the rail, I pushed the pin and it shot right out.

Why does my car engine not want to start?

If the engine still doesn’t seem like it wants to start, probably fuel is getting into the cylinders and your problems lies somewhere else. However, if the engine runs momentarily and dies, then the problem is that fuel is not getting to the cylinders. Check for a clogged fuel filter, or a bad fuel pressure regulator.

What to do if your scooter wont idle or start?

If your scooter wont idle or start check your fuel petcock. This is one major problem if yours is bad. You can get clear hose and llok for moisture. Its much better then sucking on the hose and getting a mouth full of gas. We stock all of these parts on our web site.

96 Chevy C1500 5.7L Vortec Truck won’t start, Replaced Fuel Pump, Filter & Has Spark. Hey everyone, I have a 1996 Chevy C1500 with a 5.7L Vortec, I got the truck recently and was told it just needed a Fuel pump, I replaced the Fuel pump, and the Filter, also the pump turns on and there is fuel up at the rail, I pushed the pin and it shot right out.

If your scooter wont idle or start check your fuel petcock. This is one major problem if yours is bad. You can get clear hose and llok for moisture. Its much better then sucking on the hose and getting a mouth full of gas. We stock all of these parts on our web site.

What does it mean when a Chevy truck won’t start?

It has spark as evidenced by putting an old spark plug into a spark plug wire and grounding the plug After spraying a small amount of starting fluid into the air intake tube, the engine starts for just a moment, then dies Three or four years ago the truck had the Reduced Engine Power warning problem.

Is the 1998 Chevy Silverado 5.7L hard to start?

Hello all, My 1998 chevy silverado 5.7L Vortec used to start as soon as you bump the key, and now it is hard to start (mainly when its cold) it takes several cranks of the engine to start and after truck warms up its okay, usually in the morning or if the truck sits for several hours after running. (i.e.

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.

Are there any issues with my GMC Silverado?

Another common issue with 2007-2013 Silverados and Sierras is that the fuel level sensor stops working. After approximately 120,000 miles, the fuel gauge may start misreading the fuel level or working inconsistently. You might find it always reads empty even right after you fill up the gas tank. It might also jump between full and empty.

Why is my Chevy Silverado not 4 wheel drive?

Over time, dirt, moisture and corrosion can affect the contacts on the bolts used to attach the wires to the frame. If you have a 2008 Chevy Silverado with 4-wheel drive problems, or a similar GMC or Chevy truck from another model year, replacing the switch will solve the issue.

Are there any recalls on Chevy Silverado trucks?

New-gen Chevrolet Silverado and GMC Sierra pickup trucks have software errors that may disable ESP and the ABS. Others may cause stalling and engine fires. Some trucks are affected by both problems. GM did not say how many of the 2019 and 2020 model trucks are still in dealer inventory. A tiny group of Cadillac CT6 sedans are also affected.

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.

Why does my 99 1500 run rough when cold?

Need a little help. I have a 99 1500 with 5.3L. When first started in cooler weather the engine misfires, runs rough. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. After running for a while and the engine warms up it runs great.

Is the Vortec 5300 rough idle when cold?

I have a 99 1500 with 5.3L. When first started in cooler weather the engine misfires, runs rough. Then it will rev way up and back down to almost stall and sometimes it will stall and I half to restart the engine. After running for a while and the engine warms up it runs great. I was thinking that the O2 sensor might be bad but not sure.

What to do if your Chevy Silverado won’t start?

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. To avoid this, cancel and sign in to YouTube on your computer.

What causes a Chevy Silverado to lean when its cold?

I’m leaning towards two things…air leak on the intake manifold or an issue with the O2 sensors when it’s cold. An air leak beween the MAF and cylinders would cause the lean condition for sure, just not sure how to troubleshoot this exactly.

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.

How can I Make my Chevy Silverado idle smooth?

I decided to use seafoam spray ( https://seafoamsales.com/sea-foam-spray/) into the intake, let it sit for about 8 minutes. Drive the piss out of the truck and now my idle is smooth as silk and looks like the instant MPG is better by about 4-8MPG.

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Ruth Doyle