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1991 GMC C1500 Sierra 5.7L Excessive Emissions
Posted to GM Driveability on 8/11/2010 1 Reply

Hey guys,

I have a truck here that has failed the nox portion of the California smog check. The egr solenoid is only given a command from the ecm to flow vacuum when the throttle is blipped / snapped. During normal cruise the ecm never commands the egr soleno...

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  Related Documents & Media  1991 GMC C1500 Sierra

 
Message Closed w/FIX

car Vehicle Data

1991 GMC C1500 Sierra

VIN 1GTEC14K6M
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFuel Injection / TBI
EmissionsCA
SymptomsExcessive Emissions
OccursNot Applicable
Message Closed w/FIX

car Vehicle Data

1991 GMC C1500 Sierra

VIN 1GTEC14K6M
Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryFuel Injection / TBI
EmissionsCA
SymptomsExcessive Emissions
OccursNot Applicable