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Thread: E38 Power Cut at 4000 RPM

  1. #1
    Junior Member
    Join Date
    Feb 2014
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    16

    Default E38 Power Cut at 4000 RPM

    Having a hard time getting an issue figured out. Seems like the truck has something limiting power around 4000 RPMs. It pulls fine until then and it just cuts power, falls right on its face.. can even hear it in the exhaust. Here's a rundown of the specs, base files and datalog.

    Beating my head against the wall for a while on this, any help is appreciated.

    2008 Sierra 2WD
    6L Stroked with 4" rods and .030 over - 10:1 compression
    1.72 Roller Rockers
    12609749 injectors
    comp thumper cam - MK54-700-11
    Long tubes and Intake
    4L80E trans PCM of NC adapter harness
    3800 Stall
    Attached Files Attached Files

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