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1991 GMC C2500 Sierra 7.4L Excessive Emissions
Posted to GM Driveability on 8/25/2005 6 Replies

i think i am missing somthing on this one. it failed for high nox so i started checking the egr valve. the valve was getting no vaccum off idle and cruise on the dyno. vaccum to the solenoid is 14 inches and out of the solenoid is 0. i can feel a small pulse o...

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  Related Documents & Media  1991 GMC C2500 Sierra

 
Message Closed w/FIX

car Vehicle Data

1991 GMC C2500 Sierra

VIN 1GTGC24N5M
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / tbi
Emissionsca
SymptomsExcessive Emissions
OccursAlways
Message Closed w/FIX

car Vehicle Data

1991 GMC C2500 Sierra

VIN 1GTGC24N5M
Engine7.4 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFI / tbi
Emissionsca
SymptomsExcessive Emissions
OccursAlways