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1G Biss Screw

Posted by mitsuowner1991, Jun 18, 2019

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  1. mitsuowner1991

    mitsuowner1991 Proven Member

    155
    3
    Joined Sep 29, 2009
    West Keansburg, New Jersey
    If the biss screw is all the way in does that make my idle high?? If i back it out will the idle go down?
     

    87  1

    2005/HONDA/CBR600RR
    rwd · manual · Misc Vehicles

    39  1

    03 Volkswagen Jetta 1.8t
    fwd · manual · Misc Vehicles

    Street Build 277  5

    1991 Mitsubishi Eclipse GSX
    16.396 @ 83.38 · 1G DSM

    215  0

    1991 Mitsubishi Eclipse GSX
    · 1G DSM
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  2. steve

    steve DSM Wiseman

    12,752
    537
    Joined Feb 3, 2002
    St. Charles, Illinois
    No, screwing the BISS in closes the air bypass and should lower the the idle speed once the ECU can no longer compensate using the ISC/IAC and timing.

    Unless you have told the ECU that your adjusting the Basic Idle Speed, it will try and maintain the programmed idle speed by moving the ISC/IAC pintle in and out and change the ignition timing.
     

    3K  0

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
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