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 was the problem with my Chevy Silverado?

The scan tool showed an O2 Sensor issue, multiple mis-fires on cylinders 1,3,5,7, and it showed a lean bank. He suggested I change plugs and wires, which I did.

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.

Is the Check Engine light on on my Chevy Silverado?

I started having a rough idle issue with my 2004 Chevrolet Silverado, 5.3L (T), and the check engine light is on. I took it to my local mechanic and he pulled the codes. The scan tool showed an O2 Sensor issue, multiple mis-fires on cylinders 1,3,5,7, and it showed a lean bank.

How does a Chevy Silverado feel at idle?

Changing plugs and wires made no difference. It seems to idle fine on initial startup, but after about 20-30 seconds, it becomes rough. It feels like it is running fine once off idle and highway speeds, but it feels like it’s about to die when idling at a stop light.

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

The scan tool showed an O2 Sensor issue, multiple mis-fires on cylinders 1,3,5,7, and it showed a lean bank. He suggested I change plugs and wires, which I did.

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

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.

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 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.

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 causes a car to die at idle?

When a car dies at idle, the last thing that drivers think of is a problem with the spark plugs. Gasoline engines require these small gadgets to deliver a spark to ignite the fuel air mixture in the combustion chamber. If you have a diesel engine, then this is something that you don’t need to worry about.

Why does idle drop when the AC is on?

if the a/c is overcharged or the expansion valve isnt equalizing it can cause excessive resistence of the compressor wheel and excessive drag on the motor. Ive seen it quite a bit Loading… I have the same problem with my idle dropping when the AC is turned on and it was the ISC.

Why does my car stall in the Cold?

If you’re having the same problem as you did in the cold, only your engine is warm, even hot, this could indicate the following problems: If you have a carburetor, you may have a bad accelerator pump or power circuit. The Fix: Replace accelerator pump or replace the carburetor. There may be a vacuum leak.

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 causes low idle on a Chevy Silverado?