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Thread: Bastardized lb7

  1. #1
    Junior Member
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    Feb 2016
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    Default Bastardized lb7

    Hey. I have a problem lb7. Truck came for me for tuning after a hack put a bunch of used parts on reused every seal and had stuff bent and twisted. Even had a broken wire fixed with a coder pin jammed in the main engine harness connector lol. It has S366, air dog lift pump, stage three cp3 (12mm) w/lbz frp (stage 3 floor it diesel cp3) headstuds/gaskets, built trans. Truck won't start on its own. off idle it builds proper rail pressure still doesn't run right with ppei max effort tuning for pump and turbo. And second pic is key on engine off. Injectors have 30k on them supposedly.


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    Last edited by crazybrowner; July 8th, 2017 at 11:02 PM.

  2. #2
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    Does this truck have an LBZ regulator in it?
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  3. #3
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    The stroker pump had a lbz regulator on it yes. We tried the stock one on it and no change.


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  4. #4
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    how many RPMs on cranking?

    have you looked over all of the fuel system, filter housing for leaks for air getting in? does it have a lift pump?

    can you get us the screenshot of it idling?
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  5. #5
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    Feb 2016
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    Not sure on rpm rolling. Rolls over fast. Has a air dog and I've bypassed the filter housing and triple checked all the fuel lines


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  6. #6
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    run a log of the attempt to start/while cranking. up load it here for us to see
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  7. #7
    Junior Member
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    Feb 2016
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    Not sure on rpm rolling. Rolls over fast. Has a air dog and I've bypassed the filter housing and triple checked all the fuel lines


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  8. #8
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    Mar 2015
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    If it's rolling over really fast trying to start it wouldnt that indicate loss of compression? Maybe not complete loss but one or so cylinders?

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  9. #9
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    Feb 2016
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    So after doing injectors it starts mint has agressive diesel knock. After screwing with it desired rail pressure was double unhooked the air dog and it

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