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Thread: GMPP 480hp LS3 with computer and harness Idle issue

  1. #1
    Tuner in Training
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    Jul 2005
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    GMPP 480hp LS3 with computer and harness Idle issue

    Has anyone had the isssue of it idleing at 875 no matter what you set all the idle rpm tables at?
    Even the scanner shows its calling for 750 and it idles at 875.

    Thanks

    Nolan

  2. #2
    Tuning Addict
    Join Date
    Jan 2015
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    Franklin, NC / Gainesville, Ga
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    Typically either your main timing table is too high in the idle areas or your airflow min is too high in those areas. Could also be the idle airflow proportional table being set too high as well, but usually it's one of the first two. Check timing first. Try taking some out with scanner controls to see if it comes down any.

    Hope this helps.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

    ~Greg Huggins~
    Remote Tuning Available at gh[email protected]
    Mobile Tuning Available for North Georgia and WNC

  3. #3
    YES.

    Check out this thread, I posted starting at #185.

    http://www.hptuners.com/forum/showth...wn-idle/page10

    I gave up on trying to "fix" it because it runs ok, but it still baffles me.