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1991 Buick Skylark 3.3L Poor Idle Quality, Misfire, MIL Lamp on
Posted to GM Driveability on 8/7/2004 10 Replies

Ok..This car came in with customer saying sometimes it backfired a lot while at idle...Code 42 is current. Electronic Spark Timing.... Now I have had some work with the 3.8 in this area so I am thinking its a similar setup... It must have a bad connection..in ...

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  Related Documents & Media  1991 Buick Skylark

 
Message Closed w/FIX

car Vehicle Data

1991 Buick Skylark

VIN 1G4NV54N3M
Engine3.3 L / 6 cyl / GAS
Trans3-speed Automatic
DeliveryFI / MPFI
EmissionsOBD1
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursIdle

Trouble Codes

42EST Circuit Error
Message Closed w/FIX

car Vehicle Data

1991 Buick Skylark

VIN 1G4NV54N3M
Engine3.3 L / 6 cyl / GAS
Trans3-speed Automatic
DeliveryFI / MPFI
EmissionsOBD1
SymptomsPoor Idle Quality, Misfire, MIL Lamp On
OccursIdle

Trouble Codes

42EST Circuit Error