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Thread: 04 Lb7 balancing fuel

  1. #1

    04 Lb7 balancing fuel

    Starting to tune my 04 lb7 with 135,000 miles and noticed the reported balancing rates seem problematic. Cylinder 7 shows + 9.5mm while coasting. injectors have 20k on them. What could be the issue? head gasket?
    please help
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    04.5 Cummins CCLB
    04 LB7 Duramax
    01 Yukon
    72 C20 Project Truck

  2. #2
    LB7 injectors are known problematic but coasting is not typically the check point. +/- 4 in park, +/- 6 in gear at idle. This is not end all be all, but a guideline check for injector health. You should also google the the return check to see if the injectors are returning excess fuel.
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    2010 GMC Sierra LMM Duramax. Exhaust and tuned

  3. #3
    Senior Tuner TheMechanic's Avatar
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    That is a bad injector.
    Your only option is replacing the one or doing all 8 as a preventative measure, and cost savings on labor if another fails