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How do you know if your iac valve is bad are there symptoms?

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Answered 2009-04-06 13:59:06

Your motor will idle badly. The revs will not stay at a constant level, even when your engine has reached operating temperature. ***Sum's Answer***- the engine will idle bad, and it wont catch its idle when droping RPM's. It may drop to 500rpm, shoot back up to 1k then slowly figure its way out to 6000-800rpm. Overall, it will idle badly, and not know where its going. It may not be your IAC motor though, I had that problem in my 03' Cavalier and it wasnt the IAC, it needed a computer update.

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