Mechanics

WHAT IS CAUSING MY CHEVY TO IDLE HIGH?

2000 Chevrolet Silverado • 156,000 miles

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!
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Prisoner1
December 31, 2011.



Check the throttle plate to see if its sticking.

Merlin2021
Dec 31, 2011.
Check throttle plate for sticking open

Merlin2021
Dec 31, 2011.
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
Prisoner1
Dec 31, 2011.
Any codes? 02 sensors come online at warm up, how many miles on this truck?

Merlin2021
Jan 1, 2012.
156000 miles on the truck. No codes, no check engine light, just a high idle when I least expect it.

Tiny
Prisoner1
Jan 1, 2012.
What size motor? What trans?With or without a/c?

Homer1967
Jan 1, 2012.
6 cylinder 4.3, five speed, with a/c

Tiny
Prisoner1
Jan 1, 2012.
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.

Homer1967
Jan 2, 2012.