IDLE FLUCTUATION IN GEAR OR RPM HUNTING. Pontiac Sunfire 1996

SUBJECT: IDLE FLUCTUATION IN GEAR OR RPM HUNTING DURING DECELERATION AND UNSTABLE IDLE (FLASH CALIBRATION)

MODELS: 1996 CHEVROLET CAVALIER 1996 PONTIAC SUNFIRE WITH 2.4L ENGINE (VIN T - RPO LD9) AND AUTOMATIC TRANSMISSION ONLY

CONDITION:

SOME OWNERS MAY EXPERIENCE AN IDLE FLUCTUATION IN DRIVE OR RPM "HUNTING" DURING DECELERATION AFTER REACHING NORMAL OPERATING TEMPERATURE.

CAUSE:

THE PCM CONTROLLED CLOSED LOOP IDLE SYSTEM MAY BE INTERACTING WITH THE GENERATOR LOAD, RESULTING IN CORRECTIONS THAT APPEAR AS IDLE SPEED FLUCTUATIONS.

CORRECTION:

A NEW CALIBRATION HAS BEEN DEVELOPED TO STABILIZE THE IDLE SPEED. THIS CALIBRATION SHOULD ONLY BE INSTALLED IF THE OWNER HAS INDICATED A CONCERN WITH THE VEHICLE IDLE STABILITY OR IDLE SPEEDS.

PERFORM THE PCM FLASH CALIBRATION PROCEDURE USING THE NUMBER 14 CD-ROM UPDATE OR LATER VERSION. CORRECT CALIBRATION INFORMATION IS LISTED IN THE CHART BELOW.

PARTS INFORMATION

APPLICATIONS/ BROADCAST PART NUMBER AND EMISSIONS CODE SCAN ID

FEDERAL BZAZ 16249193 CALIFORNIA BZBA 16249203 EXPORT BZAY 16249183

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

PROCEDURE LABOR OPERATION LABOR HOURS

PROM--REPROGRAMMING, ON CAR J6355 0.4*

*DIAGNOSIS TIME MAY BE CLAIMED FOR 0.0 TO 0.7 HOURS DEPENDING ON ACTUAL TIME PERFORMING DIAGNOSIS.

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.