WHAT IS CAUSING MY CHEVY TO IDLE HIGH?

2000 Chevrolet Silverado

Tiny

Prisoner1

December, 31, 2011 AT 10:44 PM

The truck will be running just fine and without warning it will not idle down when I take my foot off the accelerator until I come to a complete stop. It will keep doing the same thing until I shut the engine off and restart the truck. I replaced the throttle position sensor without any change. It seems to do it after the truck is warmed up. I have not noticed the problem when the truck is cold. I could keep replacing parts until I go broke according to the troubleshooting book. Help!

8 Answers

Tiny

merlin2021

December, 31, 2011 AT 11:38 PM

Check the throttle plate to see if its sticking.

Tiny

merlin2021

December, 31, 2011 AT 11:39 PM

Check throttle plate for sticking open

Tiny

Prisoner1

December, 31, 2011 AT 11:58 PM

I took the throttle body off and cleaned it 2 weeks ago. The plate is not sticking. Do you have another solution? Before you answer, I have also considered replacing the EGR valve, the idle control sensor, and a few other parts. Please tell me you can give me something I haven't thought of.

Tiny

merlin2021

January, 1, 2012 AT 4:59 AM

Any codes? 02 sensors come online at warm up, how many miles on this truck?

Tiny

Prisoner1

January, 1, 2012 AT 3:00 PM

156000 miles on the truck. No codes, no check engine light, just a high idle when I least expect it.

Tiny

homer1967

January, 1, 2012 AT 5:20 PM

What size motor? What trans?With or without a/c?

Tiny

Prisoner1

January, 1, 2012 AT 10:49 PM

6 cylinder 4.3, five speed, with a/c

Tiny

homer1967

January, 2, 2012 AT 1:56 AM

I would suspect a faulty idle air control valve. Although there are t.S.B's for this vehicle to have the pcm re-flashed. But I would try a new i.A.C. Valve first.

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