2000 Z28 Idles High in Summer
Thread Starter
Teching In
Joined: Sep 2012
Posts: 29
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2000 Z28 Idles High in Summer My 2000 Z28 M6 with 90K miles idles high (1100 or so, vs the usually 700) but only when the car is warmed up, and only during the summer months when we're over 80 degrees or so.
Towards the end of last summer I:
1) Cleaned the throttle body and MAF.
2) Replaced the Idle Air Control sensor
That seemed to fix it, but now I realize it was probably a temperature thing - it was fine during the fall winter and spring, but now that it's consistently hot again, I can't go more than about 10-15 minutes of driving before it starts to idle high again. I re-cleaned everything, including the IAC sensor, but still getting the issue.
What should my next step be? Replace the TPS?
Car isn't throwing any codes, but sometimes it almost feels to hesitate for a split second during acceleration.
Thanks!
Towards the end of last summer I:
1) Cleaned the throttle body and MAF.
2) Replaced the Idle Air Control sensor
That seemed to fix it, but now I realize it was probably a temperature thing - it was fine during the fall winter and spring, but now that it's consistently hot again, I can't go more than about 10-15 minutes of driving before it starts to idle high again. I re-cleaned everything, including the IAC sensor, but still getting the issue.
What should my next step be? Replace the TPS?
Car isn't throwing any codes, but sometimes it almost feels to hesitate for a split second during acceleration.
Thanks!
TECH Senior Member
Joined: Jun 2016
Posts: 22,295
Likes: 3,617
From: Central Cal.
Sounds like it's only doing it when going closed-loop, after it warms up. The intake air temp sensor might be defective, and not reading correctly when very warm, possibly causing a calibration error somewhere else. I don't know if the IAT would throw a code in such a situation. Just my .03(inflation, lol) again...
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