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Thread: LMM: working a mystery

  1. #1
    Lifetime Member killerbee's Avatar
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    Default LMM: working a mystery

    Here is the situation. Every once in a while, for no reason that I can figure, I lose fuel command. Here is a screen print and the log is attached. The cursor is on the event. The loss occurs beginning frame 467.

    I'll bet this is happening to a lot of you. Unexpected power interuption. See log below the pic.

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    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

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    Yep, pretty much sums it up right there. Annoying as heck. I thought I was the problem.
    2007.5 RCLB 4x4 WT LMM 8594OS

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    Whoa... thats pretty interesting. Does it do it in stock for as well?
    '07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that

    '06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
    Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor

    465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME

  4. #4
    Lifetime Member killerbee's Avatar
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    I guess it could be a downshift torque event, but that seems like extreme defueling.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

  5. #5
    Lifetime Member killerbee's Avatar
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    Quote Originally Posted by bballer182 View Post
    Whoa... thats pretty interesting. Does it do it in stock for as well?

    Yes. however there is a difference. Here is a stock run. MM3 falls off but look at how pressure doesn't nosedive.

    I noticed that the pressure transient table is higher than the low table. Could it be that shifts use the transient pressure table? Just throwing out possibilities.

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    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

  6. #6
    Lifetime Member killerbee's Avatar
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    We really need a laptop trqref PID that will show some torque correlation to these observations.

    The LBZ PID does not work on LMM. Ross, please help?
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

  7. #7
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    Quote Originally Posted by killerbee View Post
    Yes. however there is a difference. Here is a stock run. MM3 falls off but look at how pressure doesn't nosedive.

    I noticed that the pressure transient table is higher than the low table. Could it be that shifts use the transient pressure table? Just throwing out possibilities.

    So this event is or is not happening during a shift?
    '07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that

    '06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
    Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor

    465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME

  8. #8
    Lifetime Member killerbee's Avatar
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    It should be clear from the rpm curve. Looks like a 6 to 4 shift.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

  9. #9
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    So you are just experiencing defuel during down shift then? thats a pretty big defuel. did you call it names and curse at the truck before driving and it's just getting back at you now?
    '07 TBSS, LS2, T42, 3SS, Black on Black on Black, Pretty much stock at the moment. EFILive will fix that

    '06 LBZ/Allison 6speed, EC, LB, 1LT, Leather
    Current Mods: EFI Live/ PTO High Idle Mod/ Factory Exhaust Brake / BD Full Bore/ TransGo Jr./ TTS Twin Lift Pumps/ MBRP 4" turbo back/ Custom air box mod/ BullyDog Outlook Monitor

    465hp/1008tq---7/25/09---Dyno Day Fast Specialties Tuning by ME

  10. #10
    Lifetime Member GMPX's Avatar
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    Quote Originally Posted by killerbee View Post
    The LBZ PID does not work on LMM. Ross, please help?
    I hear your plea's, I do!
    What is the PID name on LBZ?
    I no longer monitor the forum, please either post your question or create a support ticket.

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