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Thread: 383 loses power above 4000rpm

  1. #21
    Tuner
    Join Date
    Sep 2013
    Location
    SF Bay Area , California
    Posts
    159
    It broke since you started this thread?
    2001 Z06 : 856/830 : Built LQ9 403ci : D1SC 17psi : Self-built , self-tuned.

  2. #22
    Tuner in Training
    Join Date
    Feb 2013
    Location
    Portsmouth,, VA
    Posts
    40
    no. when I originally built the engine and had it "tuned" the truck ran good. I should use good loosely. but the truck did have much more power and could climb to 6000 rpm. I drove it home from work one day and the next day it had no power. so I parked it for a few months because of surgeries and my pending medical retirement. once I settled in Virginia I started to drive it and change fuel filters and testing my fuel pump. on the way to the store it broke the valve spring and it sat for several months waiting on money to fix it. I pulled the engine and fixed the heads and installed the engine to have the exact same issue. so that is why I turned here thinking it was a tune issue or that my data log would show where my issue is.