Skip the auto shop - Our mechanics make house calls

Q: high idle on startup, 2002 Chevrolet Avalanche

asked by on

high idle on startup sometimes dies when put in gear the longer it idles the better it does have changed many parts no change. have changed the ecm throttle position sensor crank position sensor idle air control valve plugs wires and coils still no change

My car has 210006 miles.
My car has an automatic transmission.

A: Hey there, it looks like you already did a ...

Hey there, it looks like you already did a fair amount of work on this. Another thing that you should take a look at is the throttle body. You may have to clean out the throttle body and get the PCM reprogrammed to correct any throttle body choking. If you’d like to have a local expert take a look, a certified technician from YourMechanic can come to your car’s location to inspect the high idle before you follow through with any more repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Rear side automatic window not working

From the information provided on your Chevy Avalanche, I can assume from my experience that it is likely that the window regulator has failed. A failing window regulator would result in the window falling inside the door. In most cases...

Q: When I turn on my headlights all my interior lights turn off like dash lights stereo and door buttons

The interior illumination through the head light dimmer control should be checked that the dimmer is turned to its brightest setting when the lights are on. If so then the light switch power supply for dimmer control needs replaced. If...

Q: Ping noise and jerking when the car idles

My guess is that the noise you are hearing it the timing chain. These engines are well known for having problems with the timing chain, camshaft actuators, and solenoids. This problem first starts out as brief rattle noise upon start...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.