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    bob496's Avatar
    bob496 Posts: 1, Reputation: 1
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    #1

    Aug 11, 2016, 11:31 AM
    Fast Idle not working
    Car idles at 750 rpm. When A/C Compressor engages, idle should go up to 1000 rpm but it remains at 750 (engine struggles). What is the fix ?
    smoothy's Avatar
    smoothy Posts: 25,490, Reputation: 2853
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    #2

    Aug 11, 2016, 12:10 PM
    Quote Originally Posted by bob496 View Post
    Car idles at 750 rpm. When A/C Compressor engages, idle should go up to 1000 rpm but it remains at 750 (engine struggles). What is the fix ?
    Sorry, my Crystal ball is broke, and I can't find my Ouija board...
    Can you tell us what vehicle you have, what year and what engine is in it?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #3

    Aug 11, 2016, 07:06 PM
    The problem likely resides with the Idle Air Control Valve (IACV). First, check the connector. If it's fine, consider replacing the IACV with a new OEM part. The PCM normally sends a signal to the IACV to increase the idle rpm, when the AC is turned on. Depending on the car, there may be a problem with the operation of the stepper motor inside the IACV. On my Honda, I can clean the IACV; however, on my Ford it's a waste of time and I replaced it with an OEM part. I tried using an aftermarket IACV, but it idled way too high.
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