For 1990-2009 cars

# ENG. SPARK KNOCK AT IDLE (FLASH W/ NEW CAL.)

#### SUBJECT: ENGINE SPARK KNOCK AT IDLE (FLASH WITH NEW CALIBRATION)

#### MODELS: 1995-96 CHEVROLET CAMARO 1995-96 PONTIAC FIREBIRD WITH 3800 SERIES II ENGINE (VIN K - RPO L36) AND AUTOMATIC TRANSMISSION

#### CONDITION:

SOME OWNERS MAY COMMENT ABOUT A SPARK KNOCK NOISE WHEN THE ENGINE IS IDLING WITH THE TRANSMISSION SELECTOR PLACED IN DRIVE AND BRAKES APPLIED. THE CONDITION MAY BE MOST NOTICEABLE WHEN AMBIENT TEMPERATURE IS ABOVE 96 DEGREES F (35 DEGREES C).

#### CAUSE:

CURRENT POWERTRAIN CONTROL MODULE (PCM) CALIBRATION MAY ADJUST THE ENGINE SPARK ADVANCE TOO HIGH DURING THESE TEMPERTURES AND LOAD CONDITIONS.

#### CORRECTION:

REFLASH THE PCM WITH THE NEW CALIBRATION. THE NEW CALIBRATIONS ARE AVAILABLE BEGINNING WITH 1997 CD DISC 18 FROM GM SERVICE TECHNOLOGY GROUP.

**IMPORTANT** DO NOT ATTEMPT TO ORDER THE CALIBRATIONS FROM GMSPO. THE CALIBRATIONS ARE PROGRAMMED INTO THE VEHICLE'S PCM VIA A TECHLINE TOOL DEVICE.

PARTS INFORMATION YEAR APPLICATION AXLE RATIO EMISSIONS PART NUMBER 1995 CAMARO/FIREBIRD 3.42 USA - NATIONWIDE 09352554 1996 CAMARO/FIREBIRD 3.08 USA - NATIONWIDE 09352144 1996 CAMARO/FIREBIRD 3.08 CANADA/UNLEADED EXPORT 09352154 1996 CAMARO/FIREBIRD 3.42 USA - NATIONWIDE 09352164 1996 CAMARO/FIREBIRD 3.42 CANADA/UNLEADED EXPORT 09352174 1996 CAMARO 3.42 JAPANESE UNLEADED EXPORT 09352184 1996 FIREBIRD 3.42 EUROPEAN UNLEADED EXPORT 09352194

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION TIME J6355 ON CAR PROM REPROGRAMMING USE PUBLISHED LABOR FLASH E PROM OPERATION TIME J6352 OFF CAR PROM REPROGRAMMING USE PUBLISHED LABOR FLASH E PROM OPERATION 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.

COPYRIGHT 1997. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.