5.0L high idle

killagt · Apr 12, 2012

1995 mustang gt 5.0L automatic, car is high idle as 2k rmp and hang their, unplug MAF idle drop down perfectly but some time it back up to 2k and drop down 800rmp. While I unplug MAF it drive fine, but some time it idle spike again.

Here what I already do, no vacuum leak, clean and reinstall IAC, and replace the MAF sensor. Now either IAC or TPS is bad, I dont know how to pull code on this OBD I. Should I buy both IAC and TPS to try out see which one is bad ? thanks

ivan12 · Apr 12, 2012

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Check voltage on TPS, should be at .98 or .098 (forget) with key on engine off. Sounds like a problem with your IAC but I don't like telling people to replace parts and have them not be the culprit. You can also buy the $20-$30 equus scanner or google how to do the paperclip method and count flashes