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Any check engine lights?
Posted by David Ingram (more from David Ingram) on Sat, 15 Oct 2005 14:44:46
In Reply to: Car became impatient: revs itself up at red lights, Nick-Prov, Thu, 13 Oct 2005 15:20:57
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Since you don't mention any check engine lights, it seems likely that the Idle Air Control (AIC) valve is probably getting a bit sticky. Its purpose, if you're not familiar with it, is to stabilize the car's idle by diverting little wisps of air past the throttle plate, so that when the engine's various accessories are switched on and off (like the AC compressor for example), the idle stays consistent.
The valve is constantly cycling between open and closed, and depending on the signals it gets from the ECU, will lengthen or shorten the open bursts to keep the proper amount of air passing by the closed throttle.
These things can get gummed up from various smoodge passing through the intake system, like crankcase oil vapors sent there via the PVC system. Many people have success removing them and cleaning them. You should do a search on AIC valve and see what techniques have worked for others. I've heard of WD-40 and of carberetor cleaner for this purpose but have not had occasion to make the repair myself.
If cleaning doesn't help, sometimes you must punt and replace the valve.
You might also give a look to your throttle cable and/or throttle body and see if there's any stiffness or binding there, in which case lubrication might solve your problem. But from your symptoms I'd guess the AIC valve is your best shot.
posted by 69.182.10...
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