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1985 Buick Riviera 5.0L Misfire
Posted to GM Driveability on 5/9/2007 19 Replies

Have this vehicle that runs great when cold. Then after few miles it will misfire under part throttle. If you go full throttle it will seem to run better. No codes, disconnected EGR valve, Oxygen Sensor. Tested vacuum pressure sensor and it respond to vacuum c...

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car Vehicle Data

1985 Buick Riviera

VIN 1G4E267YXF
Engine5.0 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryCARB / 4 BBL
EmissionsCALIF
SymptomsMisfire
OccursHot, Under Load
Misc.2Door Convertible
Message Closed w/FIX

car Vehicle Data

1985 Buick Riviera

VIN 1G4E267YXF
Engine5.0 L / 8 cyl / GAS
Trans4-speed Automatic
DeliveryCARB / 4 BBL
EmissionsCALIF
SymptomsMisfire
OccursHot, Under Load
Misc.2Door Convertible