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Thread: ls2 wont always keep running after a hot start.

  1. #1
    Potential Tuner
    Join Date
    Jun 2016
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    3

    ls2 wont always keep running after a hot start.

    Struggling with a hot start issue on a supercharged LS2 wont always keep running after a hot start., Fires ok then dies.
    Have to give it some throttle then it will idle and run fine.

    Have added to starting airflow, but doesn't seem to help, looks like maybe timing is killing it?

    thanks

    Tune ve ls2 poor starting.hpt Log starting.hpl
    Last edited by grotty; 04-15-2023 at 04:50 AM.

  2. #2
    i had something like that with my cammed ls2. i lowered the cranking ve a bit and that helped out

  3. #3
    Senior Tuner
    Join Date
    Nov 2006
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    2,821
    I would go a little more on starting airflow.

    Also verify its building and holding fuel pressure during this issue.
    Tuner at PCMofnc.com
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  4. #4
    Advanced Tuner
    Join Date
    Aug 2010
    Location
    Detroit, MI
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    941
    VVE is chaos, spark is chaos. Startability comes after base engine cal...need to get fueling and spark sorted out.

  5. #5
    Tuning Addict blindsquirrel's Avatar
    Join Date
    Apr 2017
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    Meridian MS
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    In addition: O2 rich/lean was changed to 380 for some reason. IMO too much of the open loop tables have been changed. Post O2 test still enabled with, I'm assuming, cats & rear O2s removed? Offset vs injector tip is zeroed out. MAF codes are Second Error, not First Error. I think I stopped looking after I got that far, it's like someone was trying to make it run bad on purpose.