1. Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;)

1G Biss Screw

Posted by mitsuowner1991, Jun 18, 2019

Please Support STM Tuned
Please Support VR-Speed Factory
  1. mitsuowner1991

    mitsuowner1991 Proven Member

    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

    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
  2. steve

    steve DSM Wiseman

    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

Share This Page

Support Vendors who Support the DSM Community
Archer Fabrication ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications OHM Racing RockAuto SouthBay Fuel Injectors STM Tuned Track Decals Track Sculptures VR Speed Factory WheelWell.com