SOME OWNERS MAY EXPERIENCE A SLIGHT TIP-IN HESITATION ON LIGHT THROTTLE ACCELERATION DURING THE ENGINE'S WARM UP CYCLE.
DUE TO ENGINE SYSTEM VARIATION, IT IS POSSIBLE TO SHIFT THE VEHICLE "RICH" IF THE VEHICLE HAS BEEN UPDATED WITH A FLASH PROM FROM SERVICE BULLETIN 57-65-24A. THE FLASH PROMS IN THAT BULLETIN WERE TO ADDRESS VEHICLES THAT WERE "LEAN" AND CAUSING STALLS. IT IS POSSIBLE TO SHIFT A VEHICLE "RICH" WITH THOSE CALIBRATIONS AND THUS INDUCE A RICH HESITATION. IF THAT HAS OCCURRED, NEW CALIBRATIONS ARE AVAILABLE TO "LEAN" THE ENRICHMENT ALGORITHM BELOW COOLANT TEMPERATURES OF 80 C (176 F).
IF SERVICE BULLETIN 57-65-24A HAS BEEN PERFORMED AND THE VEHICLE EXHIBITS A SLIGHT TIP-IN HESITATION DURING WARM UP AND NORMAL DIAGNOSTICS FAIL TO SHOW A CAUSE, THEN INSTALL A NEW FLASH PROM.
PARTS INFORMATION THE COMPLETE LISTING OF NEW FLASH PROMS WILL BE AVAILABLE FOR TECHLINE TOOLS STARTING WITH CD #14 RELEASE FROM THE GM SERVICE TECHNOLOGY GROUP (STG).
MODEL AXLE CALIBRATION YEAR CARLINE RATIO EMISSION NUMBER
94 N 2.97 NATIONWIDE 16247094 94 N 2.93* NATIONWIDE 16247084* 94 L 2.97 NATIONWIDE 16247064 94 L 2.93* NATIONWIDE 16247074* 95 L 2.93 NATIONWIDE 16247114 95 N 2.93 NATIONWIDE 16247104
*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, ON CAR LABOR CODE: J6352 PROM REPROGRAMMING, OFF CAR LABOR TIME: USE PUBLISHED LABOR 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.
COPYRIGHT 1996. GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.