All the sudden I'm idling really high when warm, is my IAC sensor out of whack? The motor and everything on it is no more than 2 years old.
All the sudden I'm idling really high when warm, is my IAC sensor out of whack? The motor and everything on it is no more than 2 years old.
What vehicle, year, engine? Does your What's Up Display show the IAC is being commanded to zero? If it is, you can disconnect the IAC while the engine is running, then shut it off, remove the Throttle Body and look to see if the IAC pintle is fully extended. If it is, you probably have a vacuum leak somewhere.Originally Posted by G20spacecruiser
Thanks bud, it's a 88 Chevy van with a 350.
I will try this and I will let you know.
IMG_20241114_154110302_HDR.jpg
After driving home about 6 mi from work, it appears to be at zero.
Last edited by G20spacecruiser; 4 Weeks Ago at 03:15 AM.
After driving home about 6 mi from work, it appears to be at zero.
IMG_20241114_154110302_HDR.jpg
Your TPS and IAC are both "0". You have a large vacuum leak or your IAC is bad. Try plugging the IAC port at the top of the throttle body that feeds the IAC valve. There are several links on this site that detail the procedure for throttle body setup.
Near ZERO TPS the IAC counts are typically 25 +/- 15
Posting a .dat file (zipped) is more helpful than a screen shot.
Capture 1.jpg
Did the smoke test, it was just the carb adapter gasket.
When I pulled the TB off, the gasket just fell apart
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