Chevrolet Repair: lumina idle, chevy lumina, vacuum leaks

Question
i was trying to contact you so many time before but you are all the time maxed aut .but anyway hi my name is enes im volvo mechanic i need some help on my car chevy lumina 3.1 91000 miles  i had itermittent  problem high idle  stays all the time around 2000rpm-2500rpm  sometimes it help if you cylcle the key off it goes to normal but it comes back to high idle .no dtc in car so i replace the idle air control valve it was good for 1 day than it came back again so know it is intermitten problem it run's good 4-5 day's than just when you drive the idle stays high or when you start the stays high until it stops 2-3 days. maybe it is the coolant sensor i thing or the pcm  or what do tyou thing to check thank you

Answer
when you replaced the IAC did you follow the directives EXACTLY before installing it ?.

Your problem could also be with a small fault within the TPS of which will not usually illuminate the CHECK ENGINE LIGHT.

Did you check for any vacuum leaks along the intake manifold ?.



autohelp