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idle, sometimes normal, sometimes high 700

posted by  Will740turbo on  Sat Jul 11 10:45 CST 2009
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last visit: Wed Oct 22 16:09 CST 2014
[RELATED]

I would check your TPS sensor and the idle set screw.

Run the diagnostics mode test for your car and see if it responds to the TPS test. If not, the idle system (including the IAC) isn't even being activated. To test the IAC separately, apply 12V to it - If there are 3 pins, middle is ground. I may be thinking about the cruise control though.

Good Luck and post back,
Will
--
1990 740 Turbo, on its way to stock specs, maybe beyond






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