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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