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 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 low idle on a Chevy C / K 1500?

Check the Pig Tail connection to the AIR IDLE CONTROL Sensor. This will impact the IDLE if the connection is bad – This will cause spike and low idling if the four prongs are wired wrong or not making proper connections. ABCD AB is Coil 1 and CD is Coil 2.

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.

Can a bad idle control valve cause stalling?

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

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 you tell if an idle air control valve is working?

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. Also check the wires going to the IAC connector.

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.

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 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 truck to stall when gas is released?

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. I have done a tune up including oil and filter, fuel filter, spark plugs, wires, cap and rotor.

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 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.

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

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

https://www.youtube.com/watch?v=SmeJ5tQUCyM

What kind of engine does a 1998 Chevy Silverado have?

The 1998 Silverado was available with three engines: a 4.3-liter V-6, a 5.0-liter V-8 and a 5.7-liter V-8. The fuel-pressure specification between the V-6 and the V-8 engines is different. The fuel pressure specification for the 1998 Chevrolet Silverado truck is from 55 to 61 lbs. per square inch (psi) for models equipped with the 4.3-liter V-6.

What should the fuel pressure be on a 1998 Chevy Silverado?

Fuel Pressure Specification The fuel pressure specification for the 1998 Chevrolet Silverado truck is from 55 to 61 lbs. per square inch (psi) for models equipped with the 4.3-liter V-6. Trucks with either the 5.0-liter or 5.7-liter V-8 should have fuel pressure between 60 and 66 psi.

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.

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.

What to do with a 98 Chevy 1500?

I want u to clean the air intake valve and idle speed control valve, follow the procedure below.

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).

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 causes stalling on a 1990 Chevy k1500?

So far it has a new distributor (for an unrelated problem), idle valve, throttle position sensor, knock sensor, temperature sensor, fuel filter, plugs & wires. The idle valve and tpi both tested bad, and replacing them helped on general driveability but didn’t affect the stalling.

What kind of engine did a 1990 Chevy truck have?

1990 Chevrolet C1500 — 350 V8 TBI — Regular Cab, Short Bed, 2 wheel drive, 89000 miles. New parts: EGR valve, coolant temperature sensor, fuel filter, idle air control valve, pcv valve, air filter, 1 oxygen sensor (in the exhaust manifold), spark plugs, distributor cap and rotor.

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

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

Why does my Silverado k1500 stall at traffic lights?

In neutral it will run indefinitely, although it gets a little rough. Pulling a vacuum line will raise the idle, but doesn’t help when you put it in gear. Pulling to a traffic light with the a/c on high, it will idle perfectly for a few seconds, then start gradually dropping, finally shudder and die after 15 -30 seconds.

What makes a 1989 Chev 305 k1500 stall?

1989 chev TBI 305 k1500. No codes and many parts later still will not idle in closed loop. sometimes a stall in open. here is the list! fuel pump/filter,tps,iac,temp sensor,map,pvc.checked all vac lines. will idle in 3.9k mode??? and 10K mode. truck sat for 3 weeks and started this. runs down the road great!

When does the idle air control valve change?

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

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.

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