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1995 Chevrolet C2500 Suburban 7.4L Excessive Emissions
Posted to GM Driveability on 7/19/2012 6 Replies

Need help guys. Car failed asm dyno smog test for nox. Linear egr can be commanded via scan tool on and off and will stall engine. During asm test, egr valve can be commanded to 75% and nox readings go from [...] to 100ppm. This tells me that ecm is not comman...

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car Vehicle Data

1995 Chevrolet C2500 Suburban

VIN 1GNGK26N0S
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / tbi
EmissionsNot OBD-II Compliant
SymptomsExcessive Emissions
Message Closed

car Vehicle Data

1995 Chevrolet C2500 Suburban

VIN 1GNGK26N0S
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / tbi
EmissionsNot OBD-II Compliant
SymptomsExcessive Emissions