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Thread: Car will not return to idle!

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  1. #1
    4speedTerror's Avatar
    4speedTerror is offline CHR Member Visit my Photo Gallery
    Join Date
    Sep 2003
    Car Year, Make, Model: 73 Z28

    Car will not return to idle!


    Ok I have a Mighty Demon 850 mech. secondaries. You have to keep an eye on her when she is warming up to keep her from dying. Once the car is warm it idles at 1200rpm....which is where I want it, it has a pretty aggressive cam.
    When you take the car out to drive after warm-up is when the idle seems to have a mind of its own. At the first stop light (maybe 2 miles of driving) the car will have an idle of 1500rpm.....then when I am approaching another stop after about 15 minutes of driving I will got to stop, and the idle will fall to 700rpm. Even when i blip the throttle it will not return to my origional set idle.
    Other than that the car runs perfect.
    This is a 4 speed car, and as soon as i push in the clutch the car just picks its own idle...lol

    Very frustrating....
    I love to stroker

  2. #2
    techinspector1's Avatar
    techinspector1 is offline CHR Member Visit my Photo Gallery
    Join Date
    May 2003
    Zephyrhills, Florida, USA
    Car Year, Make, Model: '32 Henway

    Install a good throttle return spring.

  3. #3
    R Pope is offline CHR Member Visit my Photo Gallery
    Join Date
    Jun 2005

    A sticking spark advance can cause the idle speed to do that.

  4. #4
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
    Join Date
    Jul 2003
    Car Year, Make, Model: '67 Ranchero, '57 Chevy, '82 Camaro,

    Does it have a choke and fast idle cam? Could be the fast idle cam is not working properly.....
    Yesterday is history, tomorrow is a mystery, Live for Today!
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