ENGINE RPM FLARE DURING GEAR SHIFTS. Chevrolet Camaro 1996

REVISION: 11/14/96

THIS BULLETIN IS BEING REVISED TO REMOVE A REFERENCE UNDER CAUSE. PLEASE DISCARD BULLETIN 67-65-24 (SECTION 6E-ENGINE FUEL & EMISSION). ----------------------------------------------------------------------

SUBJECT: ENGINE RPM FLARE DURING GEAR SHIFTS (REPAIR CLUTCH ANTICIPATE/CRUISE RELEASE CIRCUIT AND NEW FLASH CALIBRATION)

MODELS: 1996 CHEVROLET CAMARO 1996 PONTIAC FIREBIRD WITH 3800 SERIES II ENGINE (VIN K - RPO L36) AND MANUAL TRANSMISSION

CONDITION:

SOME CUSTOMERS MAY COMMENT ABOUT AN ENGINE SPEED FLARE, UP TO 500 RPM, DURING GEAR SHIFTS. THIS CONDITION IS MOST PROMINENT WHEN SHIFTING GEARS AT ENGINE SPEEDS BELOW 2500 RPM.

CAUSE:

AFTER CHECKING FOR AND REPAIRING ANY DIAGNOSTIC TROUBLE CODES (DTC) THAT MAY BE PRESENT, CHECK THE CLUTCH ANTICIPATE/CRUISE RELEASE SWITCH FOR PROPER OPERATION. THE CLUTCH ANTICIPATE SWITCH IS NORMALLY CLOSED WHEN THE CLUTCH PEDAL IS IN THE UP POSITION. THE SWITCH OPENS WHEN THE CLUTCH PEDAL IS DEPRESSED (DOWN POSITION). IF THE CIRCUIT IS NOT OPERATING CORRECTLY, THE POWERTRAIN CONTROL MODULE (PCM) WILL NOT RECEIVE PROPER INFORMATION DURING GEAR SHIFTS THAT ARE MADE BELOW 2500 RPM WHICH COULD CAUSE THE FLARE CONDITION.

CORRECTION:

1. REPAIR THE CLUTCH ANTICIPATE/CRUISE RELEASE CIRCUIT AS REQUIRED. 2. FLASH PCM WITH NEW CALIBRATION. THE NEW CALIBRATION IS LESS SENSITIVE TO CLUTCH ANTICIPATE SWITCH INFORMATION. 3. TEST DRIVE THE VEHICLE AFTER THE ABOVE REPAIRS TO VERIFY THAT THE CONDITION HAS BEEN CORRECTED.

PARTS INFORMATION THE NEW FLASH CALIBRATION IS AVAILABLE BEGINNING WITH THE APRIL 4, 1996 CD NUMBER 7 FROM GM SERVICE TECHNOLOGY GROUP. DO NOT ATTEMPT TO ORDER THE CALIBRATIONS FROM GMSPO. THEY ARE PROGRAMMED INTO THE VEHICLE'S POWERTRAIN CONTROL MODULE (PCM) VIA A TECHLINE TOOL DEVICE.

1996 CAMARO/FIREBIRD NATIONWIDE EMISSIONS 16238374 1996 CAMARO/FIREBIRD EXPORT EMISSIONS 16238424 1996 FIREBIRD EUROPE EXPORT EMISSIONS 16238364

WARRANTY INFORMATION LABOR OPERATION DESCRIPTION TIME R1245 REPLACE/ADJUST CLUTCH USE PUBLISHED LABOR ANTICIPATE/CRUISE RELEASE SWITCH OPERATION TIME

ADD DIAGNOSE CLUTCH ANTICIPATE/ USE PUBLISHED LABOR CRUISE RELEASE CIRCUIT OPERATION TIME

J6355 PROM - REPROGRAMMING USE PUBLISHED LABOR FLASH E PROM OPERATION TIME

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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.