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Originally Posted by mdrush
MT....I don't have a fuel pressure guage or Vaccum guage so I'll try and borrow one this week. My scanner doesn't have an injector balance test but I did scan for injector faults and the reading was 112. Compression test came out good as follows
Cyl 1 161
Cyl 2 158
Cyl 3 160
Cyl 4 162
Cyl 5 157
Cyl 6 160
As far as the pressure goes the BARO is half the MAP and Atmosphere
Atmosphere = 14.74 psi (101.6 Kpa) today from NOAA
MAP (Engine off) = 14.1 psi (97.22 Kpa)
BARO (Scanner) = 6.9 psi (46.9 Kpa)
Where is the BARO reading coming from ?
Switched plugs and wire on Cyl 2 and 4 and ran seafoam through the vac line and gas tank. Took the truck for a spirited run and was able to accel past 3 thousand 3 times....on the way back I made it to 3900 and the SES light went off...scanned it and saw Cyl 2 - 787 MF, Cylinder 1 - 26 MF...code was P0302....better but not great.
Thanks
Mike
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The baro readings come from the maf sensor.
Looks like you may be on top of mt everest or way up in the air from your readings.
That could be your problem on missfire.
e mail me at
crunch@troublecodes.net and i will send you a pdf on Baro readings and some info on it.
Also try a disconnect on MAF sensor and drive it and see what it does.
MT