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Thread: Hard Start issue

  1. #1
    Tuner in Training
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    Hard Start issue

    This may not be the correct description of what's happening, but the issue is that my car will fire up and then die, or idle very rough (100-200 rpms) and then die. Normally it will take 5-10 attempts for it to run stable.

    This isn't a great example, of course things never work like you expect. I took a quick vid, it starts and idles for a couple seconds then dies. Then starts right up.

    http://youtu.be/EFO0fg5vF9c

    Does anyone happen to know if there is anything that is obvious from my tune?

    Any help would be greatly appreciated.

    Thanks,
    Averyhard start 10.23.14.hplCody Tuning cranking ve 10.14.14.hptcody stft.cfg

  2. #2
    Advanced Tuner Cyrperformance's Avatar
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    Do you have the MAF codes disabled? I can't look at tune as I'm not in front of PC.

    2006 Escalade LMM Duramax Tuned
    2000 S10 Twin Turbo 6.0L
    56 GMC 100 Status Unknown

  3. #3
    Advanced Tuner Cyrperformance's Avatar
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    May want to add description of vehicle and modifications as well.

    2006 Escalade LMM Duramax Tuned
    2000 S10 Twin Turbo 6.0L
    56 GMC 100 Status Unknown

  4. #4
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    Quote Originally Posted by Cyrperformance View Post
    Do you have the MAF codes disabled? I can't look at tune as I'm not in front of PC.
    Yes they are

    Quote Originally Posted by Cyrperformance View Post
    May want to add description of vehicle and modifications as well.
    I guess that would help.

    it's a 1991 240sx with a 2001 LQ4 using a 2004 GTO PCM and harness (6spd)
    Mods:
    4.030" -11cc dished pistons (Wiseco K444x3)
    Compstar Rods
    Comp Cams 232/240 (.595/.608) 115 lsa
    Patriot performance Gold dual springs
    Stock 317 head castings with 5 angle valve job
    Siemens 60lb injectors w/ Greg Banish data
    Bosch 044 external pump
    Aeromotive 13101 regulator (58psi)
    LS6 intake
    2 bar GM map sensor (12580698)
    76mm Turbo

    That should be the jist of it

  5. #5
    Advanced Tuner Cyrperformance's Avatar
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    The codes should be set to MIL ON FIRST, not no error. Again can't look at tune just throwing out suggestions of having the same issue. If the PCM doesn't see there error it doesn't go SD

    2006 Escalade LMM Duramax Tuned
    2000 S10 Twin Turbo 6.0L
    56 GMC 100 Status Unknown

  6. #6
    Advanced Tuner Cyrperformance's Avatar
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    Also post a log of it happening.

    2006 Escalade LMM Duramax Tuned
    2000 S10 Twin Turbo 6.0L
    56 GMC 100 Status Unknown

  7. #7
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    Quote Originally Posted by Cyrperformance View Post
    The codes should be set to MIL ON FIRST, not no error. Again can't look at tune just throwing out suggestions of having the same issue. If the PCM doesn't see there error it doesn't go SD
    they are


  8. #8
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    Quote Originally Posted by Cyrperformance View Post
    Also post a log of it happening.
    log, tune and config are in my original post

  9. #9
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    idle.JPG Is it ok to have 0's in here?
    PE.JPG Never seen someone calling for PE that quick

    I'm no expert by far, but here are a couple of things I noticed that do not seem right to me. Maybe somebody with more knowledge will chime in.
    Last edited by Tim_P; 10-23-2014 at 05:27 PM.

  10. #10
    Advanced Tuner Cyrperformance's Avatar
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    No PE should come in around 55KPA in N/A if I remeber correct and the table should call for desired AFR such as 1.17 = 12.5 roughly if stioch is 14.68. I believe with everything 0 it would call for PE immediately and could be part of the issue.

    2006 Escalade LMM Duramax Tuned
    2000 S10 Twin Turbo 6.0L
    56 GMC 100 Status Unknown