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1988 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions, Misfire
Posted to GM Driveability on 12/13/2000

hi all, this thing will run fine then all of a sudden go full rich, just pouring black smoke out of tailpipe, fuel pressure stays at 14, checked map, coolant, o2 and tps all are functioning [...] for loss of rpm signal to ecm, all checks ok, performed voltage ...

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car Vehicle Data

1988 Chevrolet C3500 Cheyenne

VIN 2GCHC39N9J
Engine7.4 L / 8 cyl / GAS
Trans3-speed Automatic
DeliveryFI / tbi
Emissionsca
SymptomsExcessive Emissions, Misfire
OccursCold, Intermittently
Misc.Dually
Message Closed w/FIX

car Vehicle Data

1988 Chevrolet C3500 Cheyenne

VIN 2GCHC39N9J
Engine7.4 L / 8 cyl / GAS
Trans3-speed Automatic
DeliveryFI / tbi
Emissionsca
SymptomsExcessive Emissions, Misfire
OccursCold, Intermittently
Misc.Dually