COLD START STALLS/ AND/OR A TIP-IN. Chevrolet Beretta 1995

REVISION: 03/20/96

THIS BULLETIN IS BEING REVISED TO CHANGE AXLE RATIOS. PLEASE DISCARD BULLETIN 57-65-24 (SECTION 6E - ENGINE FUEL & EMISSION). ---------------------------------------------------------------------- SUBJECT: COLD START STALLS AND/OR A TIP-IN HESITATION ON ACCELERATION (NEW FLASH CALIBRATION)

MODELS: 1994-95 BUICK SKYLARK, REGAL 1994-95 CHEVROLET BERETTA, CORSICA, LUMINA, MONTE CARLO 1994-95 OLDSMOBILE ACHIEVA, CUTLASS SUPREME 1994-95 PONTIAC GRAND AM, GRAND PRIX WITH 3100 V6 ENGINE (VIN M - RPO L82)

CONDITION:

SOME OWNERS MAY EXPERIENCE A COLD ENGINE START AND STALL AND/OR A TIP-IN HESITATION ON COLD ENGINE LIGHT ACCELERATION.

CORRECTION:

A NEW FLASH PROM CALIBRATION HAS BEEN RELEASED TO SERVICE VEHICLES WHICH EXPERIENCE THE CONDITIONS MENTIONED ABOVE. THE NEW CALIBRATIONS ADD FUEL TO THE THROTTLE POSITION SENSOR ENRICHMENT ALGORITHM BELOW COOLANT TEMPERATURES OF 80 DEGREES C (176 DEGREES F).

PARTS INFORMATION THE COMPLETE LISTING OF NEW CALIBRATION NUMBERS WILL BE AVAILABLE FOR TECHLINE TOOLS STARTING WITH THE OCTOBER CD RELEASE FROM GM SERVICE TECHNOLOGY GROUP (STG).

IMPORTANT: DO NOT ATTEMPT TO ORDER THE CALIBRATION NUMBERS FROM GMSPO. THE CALIBRATIONS ARE PROGRAMMED INTO THE VEHICLE'S POWERTRAIN CONTROL MODULE VIA A TECHLINE TOOL DEVICE.

MODEL CARLINE AXLE EMISSION CALIBRATION YEAR RATIO NUMBER

94 L 2.93* EXPORT 16230724

94 L 2.97 EXPORT 16230734

95 L 2.93 EXPORT 16227344

94 L 2.97 NATIONWIDE 16230714

94 L 2.93* NATIONWIDE 16230704

95 L 2.93 NATIONWIDE 16227354

95 N 2.93 EXPORT 16227364

94 N 2.93* NATIONWIDE 16230744

94 N 2.97 NATIONWIDE 16230754

95 N 2.93 NATIONWIDE 16227374

94-95 W 3.33 NATIONWIDE 16233204

95 W 3.33 POLICE 16233214 PACKAGE

* REQUIRES SERVICE BULLETIN 47-71-31 (REPLACEMENT OF FINAL DRIVE ASSEMBLY) TO HAVE BEEN PERFORMED. THE STANDARD AXLE RATIO IS A 2.97.

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR CODE J6355 PROM, REPROGRAMMING

LABOR TIME: USE PUBLISHED LABOR TIME.

FIGURES: 0 ATTACHMENTS: 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.