Question about 1994 Chevrolet Lumina APV

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IAC motor I have a 94 chev lumia APV 3.8 liter. IAC motor goes to high RPM on start up and will not lower. Have changed IAC, Hooked Scanner to Van and tryed to control IAC manualy with no change. Checked wiring to computer, Power and grounds and to IAC motor. Also tryed new ECM. All sensor readings with in spec. Does anyone ave any ideas?

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  • BTWOMULLER Jul 31, 2008

    no vac leak and Battery was not disconnected. I can control the IAC with a thexton control unit just not by the OBD system.

  • yadayada
    yadayada May 11, 2010

    Do you have an intake vacuum leak??, Did you disconnect battery and do an ilde relearn??

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OBD does not control, an idle logic circuit does, Disconnect the battery and let it relearn idle speed, it has fuzzy logic capability, so it learns your driving habits.

Posted on Jul 31, 2008

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Rpm 2500 to 3000 when you start then goes down 1500


In 99% of the cases of GMs doing that it's the Idle Air Control motor, which you already changed. But changing it does not always fix the problem. First, if you bought the new IAC motor second hand, change it again cause last time i had to change mine 3 times before i got one that worked OK. Second, if it was bought new and/or your are 100% sure the IAC is working fine, then you probably just have to much carbon deposits where the motor's tip and the intake manifold meet and are supposed to seal up, preventing it from closing normally and giving the engine too much air, cause the high RPM idle. So take the IAC out again, clean the opening, lip and everything you can see and get into around that area, with a cue-tip and some contact cleaner, or lighter fluid or rubbing alcohol to get all the carbon deposits out and you should be ok. If not, then the problem probably resides in the car's onboard computer.

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