New motor/programming Issues> HELP!!
#1
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Location: Sacramento, Ca
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New motor/programming Issues> HELP!!
I am new to PT, so hope I'm posting in the right place. Last week re-installed motor in my 08 GMC Sierra SLT after AFM delete, bigger cam, head work etc. Tuner programmed my computer( out of truck), put motor back in, started first crank, then ran like s$@t. Checked, double checked all the mechanical stuff, couldnt find anything. Talked to tuner who swears the tune should be dead nuts and says its because of low fuel pressure,(42-44 lbs.) Yesterday swap out stock pump for Aeromotive Stealth 340, fire it up and 44 lbs. Fuel pressure is low, fuel trims are 29%-33%, getting codes for lean and an intermittent o2, but nothing else. Have been over this thing with a fine tooth comb, checking grounds, sensors, vacuum leaks, etc. and dont know where to go next, other than crazy. Anyone have similar experience and have any ideas. Tune or Mechanical?? Thanks
#5
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Fuel pressure
08 has no pressure regulator, it has a fuel pressure module, in the under hood fuse block. Fuel pressure actually dropped from 44.9 to 42.6 after installing the nee pump, which will flow up to 90psi. Also, everything was working fine before the timing chain broke, which started this whole thing.
#6
Formerly ScreamingL
FPCM controls fuel pressure so it doesnt exceed 43 psi until load occurs where it needs the extra fuel pressure
truck runs like crap cause tuner guessed on the calibration, take truck to place to tune it in person
truck runs like crap cause tuner guessed on the calibration, take truck to place to tune it in person
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