1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Trouble Logging In or Staying Logged In?

    CLEAR YOUR BROWSER COOKIES! More info about this can be found here. If you still have trouble after clearing your browser's cookies and cache, reply to that thread and tell us what browser you're using and what device you're using.

2G GHS GSX Project- High Idle

Posted by gijoe985, Apr 26, 2018

Please Support Fuel Injector Clinic
  1. gijoe985

    gijoe985 Proven Member

    433
    9
    Joined Dec 13, 2007
    Grandview, Washington
    Hey all,

    So, we've got our high school shop car finally running and premsumably boost leak free. (We will check once again for boost leaks, we may have a small on at the throttle body, but they we're mostly handled a while back.) So, if you've seen our other threads, we've got a 95 gsx, 880 injectors, and DSMlink V2 (and more stuff). Right now I have to unscrew the BISS pretty far to get it started and idling, but it idles at 2k. I can start screwing it in and get it down to 1600ish, but it eventually runs rough and dies. It has good compression all around, etc. I may need to check soon for a leaky inejctor or something. Anyway, I'm open to hear your guys' thoughts, we've done most of the basics.

    If I ground the diagnostics ports via dsmlink, it kills the engine almost instantly.

    Wideband shows 13.5-14:1 at idle.
     

    Log in/Register to remove ads
    Last edited: Apr 26, 2018
    My DSM:
    Loading...

    Featured Products from our Supporting Vendors

  2. pauleyman

    pauleyman DSM Wiseman

    4,760
    815
    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    Check for throttle closed. Ecu should cut fuel at 1500 at idle. If it doesn't it isn't really closed or possible throttle stop or tps adjustment issue. If you biss screwed out some and grounding kills the car....hmmm...did you check isc?
     
    My DSM:
    1997 Eagle Talon TSi AWD

    Street Build

    T25   manual
    Loading...
  3. Atlantian

    Atlantian Probationary Member

    26
    2
    Joined Jan 13, 2018
    Erie, Colorado
    Also make sure all boost leaks are gone they have been a huge plague that has messed with me and my setup for a while. It can cause all sorts of issues that you wouldn’t even think of including idle issues and power loss. Not sure if this will help but it can’t hurt to check.
     
    My DSM:
    Loading...
  4. chrysler kid

    chrysler kid Proven Member

    1,555
    368
    Joined Dec 20, 2002
    Mckinney, Texas
    Timing is off a tooth. There's no reason a car goes 1600 idle and stalls out instantly under that
     
    Loading...
  5. pauleyman

    pauleyman DSM Wiseman

    4,760
    815
    Joined Nov 19, 2011
    oklahoma city, Oklahoma
    Sure there is. Isc closing malfunction. Just as feasible.
     
    My DSM:
    1997 Eagle Talon TSi AWD

    Street Build

    T25   manual
    Loading...
  6. chrysler kid

    chrysler kid Proven Member

    1,555
    368
    Joined Dec 20, 2002
    Mckinney, Texas
    Eh, that seems unlikely for an electrical fault to cause such a severe issue and not trigger and code for malfunctions
     
    Loading...
  7. gijoe985

    gijoe985 Proven Member

    433
    9
    Joined Dec 13, 2007
    Grandview, Washington
    So, we received this car modified and not runnign, so we set the SAS to the factory suggestion or 1-1/4 turns opened once it begins opening the throttle plate. We then adjusted the BISS (pretty far out, like 4-5 full turns) until the ISC read 30 on DSMlink. Idle was still at 1500+

    We do need to do this again. A student with a DSM borrowed the leak tester, so once he brings it back we will check again. We did swap throttle bodies. So need to see if the one we're using is leaking.

    I doubt it, but it honestly doesn't hurt to check.


    And thank you guys. I know that there are a lot of threads dedicated to similar issues, but with the school year widning down and me having 4-5 car projets kids are working on, my brain hurts from troubleshooting. It's great to be able to share the load.
     
    My DSM:
    Loading...
  8. gijoe985

    gijoe985 Proven Member

    433
    9
    Joined Dec 13, 2007
    Grandview, Washington
    Anyone have any other input considering our throttle body settings? We set the SAS back to what the manual said and then the BISS still needed to be turend out about 5 FULL turns.

    Trying to get the boost leak tester back today.
     
    My DSM:
    Loading...
  9. gijoe985

    gijoe985 Proven Member

    433
    9
    Joined Dec 13, 2007
    Grandview, Washington
    OK, so I think boost leaks are gone. We replaced the TB seals and blocked off the EGR.

    NOW, still doesn't run great. Small steps forward, but not good.

    I want to get new plugs, we have Autolites in there right now which was all the store had at the time. We'll pick up some NGK coppers.

    That said, I've used a laser thermometer to check exhaust temps and Cylinder 1 is running hotter than the rest and cylinder 4 cooler than 2&3. 2&3 are about even. So I'm kind of wondering about the condition of my injectors at this point. They came with the car. I don't know much about them other than they are supposed to be 880cc. I'm kind of wondering if it is worth having them professional cleaned, or to just buy new injectors at this point. If so, what?
     
    My DSM:
    Loading...
  10. chrysler kid

    chrysler kid Proven Member

    1,555
    368
    Joined Dec 20, 2002
    Mckinney, Texas

    The verbage in the manual also dictates the amount of screws on a brand new car with brand new compression, and a used car, are not set variables. The biss is used once the car is fully warmed up and the idle air control valve is in position 30, to set idle speed. It's also relative to the temperature of the coolant, so the screw is to be calibrated once the car has gotten up to full temperature, because the stock throttle body is heated by coolant

    So you can't just say it's a finite number of turns, it can be different for different cars. Engine vacuum, coolant temperature, ambient air pressure, all play a role in where the screw should be set at. I want to say I even saw a tech note in one of my manuals that cars sent to higher elevations were expected to need calibration once they arrived
     
    Loading...

Share This Page

Loading...


Log in/Register to remove this ad

Support Vendors who Support the DSM Community
Ace Race Parts Archer Fabrication Best Used Tires Boostin Performance ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Miller Import Parts Morrison Fabrications OHM Racing RockAuto SouthBay Fuel Injectors STM Tuned Tire Rack VR Speed Factory White Shed Speed