My car was idling a little too high rpm so I replaced the idle air control valve myself and now when I turn the car on it revs up to 3000 rpm down to almost wanting to shut off then it goes back and forth. I do not know what I need to go back and check or if it is the new part itself.
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Sunday, July 16th, 2017 AT 11:34 AM
1 Reply
CARADIODOC
MECHANIC
33,916 POSTS
When the idle speed drops down, unplug the idle speed motor, then see what happens to engine speed. If it still surges up and down, there is a vacuum leak that is allowing in extra air.