DRIVEABILITY CONCERNS (INSTALL NEW EE 'FLASH' PROM CAL.). Chevrolet Camaro 1993

********************************************************************* REVISION 11/17/93 THIS BULLETIN IS REVISED TO CLARIFY PART AVAILABILITY STATEMENT AND LABOR TIME INFORMATION. *********************************************************************

SUBJECT: DRIVEABILITY CONCERNS (INSTALL NEW EE "FLASH" PROM CALIBRATION)

MODELS: 1993 CHEVROLET CAMARO 1993 PONTIAC FIREBIRD (EQUIPPED WITH 3.4L (L32) V6 ENGINE)

CONDITION:

SOME OWNERS MAY EXPERIENCE A DRIVEABILITY CONCERN ADDRESSED BY REPROGRAMMING THE POWERTRAIN CONTROL MODULE (PCM) WITH A NEW "FLASH" EE PROM PROGRAM AND/OR REPLACEMENT OF THE THROTTLE BODY.

CORRECTION:

THE FOLLOWING DRIVEABILITY CONCERNS CAN BE CORRECTED WITH A NEW "FLASH" EE PROM PROGRAM AND/OR REPLACEMENT OF THE THROTTLE BODY.

TRANSMISSION APPLICATION DESCRIPTION AUTOMATIC MANUAL ----------- --------- ------ COMMONIZES MALFUNCTION INDICATOR LAMP X X (MIL) OPERATION AT KEY ON/ENGINE OFF WITH OTHER VEHICLES.

COLD ENGINE, THROTTLE BUMP FELT WHEN X X THROTTLE IS ADVANCED SLOWLY FROM CLOSED TO OPEN OVER APPROXIMATELY A ONE SECOND PERIOD.

ELIMINATES DIAGNOSTIC TROUBLE CODES X (DTCS) 45 AND 65 FROM BEING SET WHEN AGGRESSIVE DRIVING IS FOLLOWED BY A STEADY HIGHWAY CRUISE SPEED.

ELIMINATES COASTDOWN BUMP. X

COLD ENGINE DRIVEABILITY DURING THE X FIRST MINUTE OF OPERATION ON A COLD ENGINE START.

INTERMITTENT INCREASE IN THE ENGINE X IDLE RPM FOLLOWING A THROTTLE CLOSURE FROM GREATER THAN 10 MPH, AT CLOSED THROTTLE TP SENSOR TOGGLES BETWEEN 0 TO 1 PERCENT.*

INTERMITTENT INCREASE IN THE ENGINE X IDLE RPM CAUSED BY A CHANGE IN THE TP SENSOR READING FROM "KEY ON/ENGINE OFF" TO "KEY ON/ENGINE RUNNING."*

*NOTE: IF THE TP SENSOR SHOWS A THROTTLE ANGLE PERCENTAGE OF TWO (2) PERCENT OR GREATER, IT IS NECESSARY TO REPLACE THE THROTTLE BODY ASSEMBLY. THE THROTTLE BODY PART NUMBER FOR THE AUTOMATIC TRANSMISSION EQUIPPED VEHICLE IS 17093126. A THROTTLE BODY GASKET, PART NUMBER 10146870, SHOULD ALSO BE USED.

PARTS INFORMATION:

THE FLASH CALIBRATIONS WILL BE AVAILABLE ON THE NOVEMBER 1993 STG CD RELEASE. THE THROTTLE BODY AND GASKET ARE CURRENTLY AVAILABLE FROM GMSPO.

DESCRIPTION PART NUMBER ----------- ----------- AUTOMATIC TRANSMISSION NB2 CALIFORNIA 16201691 AUTOMATIC TRANSMISSION NA5 FEDERAL 16201671 MANUAL TRANSMISSION NATIONWIDE 16194251

WARRANTY INFORMATION:

LABOR OPERATION: T0500 - REPROGRAM PCM LABOR TIME: 0.3 HOUR

IF REPLACEMENT OF THE THROTTLE BODY ASSEMBLY IS REQUIRED, USE LABOR OPERATION NUMBER J5490. USE PUBLISHED LABOR OPERATION TIME.

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.