Grand AM V6-3100 3.1L MFI VIN M (1994)
PROM - Programmable Read Only Memory: Customer Interest
PROM - Engine Bump When Throttle Is Closed
Group Ref.: Engine Fuel & Emission
Bulletin No.: 376515
Date: December, 1993
SUBJECT:
ENGINE BUMP ON THROTTLE CLOSURE (INSTALL NEW FLASH PROM)
MODELS:
1994 BUICK SKYLARK
1994 CHEVROLET CORSICA, BERETTA
1994 OLDSMOBILE ACHIEVA
1994 PONTIAC GRAND AM
EQUIPPED WITH THE 3100 V6 ENGINE (RPO L82 - VIN M)
CONDITION:
Some owners may experience a bump while closing the throttle. This condition is most noticeable with a fully loaded vehicle or when the vehicle is on a
grade.
CAUSE:
The engine calibration was too aggressive on leaning out the air fuel ratio on throttle closure.
CORRECTION:
Reflash the PCM with the new calibration. Regular vehicle production built after the VIN breakpoints (see illustration) already have this calibration from
the vehicle assembly plant.
PARTS INFORMATION:
The new flash calibration will be available on the November STG CD. Part numbers
WARRANTY INFORMATION:
Labor Operation: T0500
Labor Time: 0.3 hours
