ENGINE BUMP ON THROTTLE CLOSURE (INST. NEW FLASH PROM). Buick Skylark 1994

******************************************************************** REVISION 12/09/93

THIS BULLETIN IS REVISED TO CORRECT THE WILMINGTON ASSEMBLY PLANT VIN NUMBER. ********************************************************************

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 BELOW ALREADY HAVE THIS CALIBRATION FROM THE VEHICLE ASSEMBLY PLANT.

ASSEMBLY PLANT CARLINE DIVISION VIN -------------- ------- -------- --- WILMINGTON CORSICA/BERETTA CHEVROLET 1G1LV15M4RY132489

LANSING (A) ACHIEVA OLDSMOBILE 1G3NL5531RM007011 GRAND AM PONTIAC 1G2NE15M7RM515113

LANSING (B) SKYLARK BUICK 1G4NV55M5RC256920 GRAND AM PONTIAC 1G2NW55M5RC714638

PARTS INFORMATION:

THE NEW FLASH CALIBRATION WILL BE AVAILABLE ON THE NOVEMBER STG CD. FOLLOWING ARE THE PART NUMBERS.

PART NUMBER CARLINE TRANS EMISSION BROADCAST ----------- ------- ----- -------- --------- 16202521 SKYLARK A-4 NATIONWIDE BKRL ACHIEVA GRAND AM

16202511 CORSICA A-4 NATIONWIDE BKRK BERETTA

WARRANTY INFORMATION:

LABOR OPERATION: T0500 LABOR TIME: 0.3 HOURS

FIGURES: 0

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.