For 1990-2009 cars

# OCCASIONAL ENGINE STALL DIAGNOSTIC/NEW SERVICE MEMCAL

THIS BULLETIN HAS BEEN REVISED TO UPDATE THE PART NUMBER FOR THE 1988 A STE MODEL.

SOME CUSTOMERS DRIVING THE FOLLOWING CARS;

- 1988 J-CAR WITH A 2.8L ENGINE (VIN CODE W) - 1989 A/J/L/W MODELS WITH A 2.8L ENGINE (VIN CODE W) - 1988 "A" ALL-WHEEL-DRIVE MODEL WITH A 3.1L ENGINE (VIN CODE T)

MAY COMMENT CONCERNING ANY OF THE FOLLOWING:

A COLD START STALL, A TIP-IN HESITATION, OR A DECEL STALL

IF A CUSTOMER COMMENT CONCERNING AN OCCASIONAL ENGINE STALL OR A DRIVE HESITATION IS RECEIVED, THEN COMPLETE THE FOLLOWING:

1. PERFORM DIAGNOSTIC CHECKS, PER SECTION 6E OF THE SERVICE MANUAL AND REPLACE ANY DEFECTIVE COMPONENTS.

PROCEED TO STEP #2 ONLY IF DIAGNOSTIC CHECKS UNCOVER NO CAUSE FOR THE CUSTOMER COMMENTS.

2. INSTALL A NEW MEMCAL, WHICH MAY BE OBTAINED FROM GMSPO (REFERENCE THE ATTACHED SERVICE PART NUMBER CHART).

#### IMPORTANT: THE FOLLOWING PROCEDURE MUST BE COMPLETED WHEN REMOVING AND INSTALLING A 60 DEGREE V6 ENGINE CONTROL MODULE (ECM) MEMCAL (REFERENCE CORPORATE BULLETIN #836540 AND #836540R).

BUICK BULLETIN # 89-6E-2 DATED 11-15-88 CHEVROLET BULLETIN # 89-41-6E DATED 12-16-88 PONTIAC BULLETIN # 89-6-9A DATED 12-07-88 OLDSMOBILE BULLETIN # 89-T-16 DATED 12-07-88 GM CANADA BULLETIN # 89-628-102 DATED 12-15-88

A). DISCONNECT THE BATTERY.

B). REMOVE CURRENT MEMCAL AND INSTALL A NEW SERVICE MEMCAL.

C). RESTORE THE BATTERY POWER AND PLACE AIR CONDITIONING CONTROLS (IF EQUIPPED) IN THE "OFF" POSITION.

D). FIRMLY APPLY THE PARKING BRAKE AND BLOCK THE DRIVE WHEELS. START THE ENGINE, AND SHIFT THE TRANSAXLE TO "DRIVE" FOR AUTOMATICS OR "NEUTRAL" FOR MANUALS.

E). ALLOW THE ENGINE TO RUN UNTIL THE ENGINE COOLING FAN HAS CYCLED ONCE, OR A MAXIMUM OF 10 MINUTES.

F). TURN THE IGNITION KEY TO THE "OFF" POSITION FOR AT LEAST 5 SECONDS.

G). START THE ENGINE, AND SHIFT THE TRANSAXLE TO "DRIVE" FOR AUTOMATICS OR "NEUTRAL" FOR MANUALS.

H). ALLOW ENGINE TO RUN FOR AT LEAST 5 MINUTES.

MEMCAL CHART ___________________

EMISSION SCANNER SERVICE YEAR DIVISION MODEL SYSTEM TRANS I.D. MEMCAL P/N ______________________________________________________________________

1989 PONT. OLDS. W FED MG2 7461 16147315 * 1989 PONTIAC, OLDS. W CAL. MG2 7471 16147316 * 1989 PONT. OLDS. BUICK W FED ME9 8151 16138169 1989 PONT. OLDS. BUICK W CAL ME9 8141 16138164 1989 CHEVROLET J FED MG2 7421 16147309 * 1989 CHEVROLET J CAL MG2 7431 16147310 * 1989 CHEVROLET J FED MD9 8121 16138219 1989 CHEVROLET J CAL MD9 8131 16138224 1989 CHEVROLET L FED MG2 7441 16147312 * 1989 CHEVROLET L CAL MG2 7451 16147314 * 1989 CHEVROLET L FED MD9 8101 16138210 1989 CHEVROLET L CAL MD9 9581 16139548 1988 CHEVROLET, COUPE J CAL MD9 4741 16134465 CHEVROLET, CONVERT. J CADILLAC SEDAN J 1988 CHEVROLET, CADILLAC J FED MG2 8261 16148227 * 1988 CHEVROLET, COUPE J FED MD9 4761 16134468 CHEVROLET, CONVERT. J CHEVROLET WAGON J CADILLAC SEDAN J 1988 CHEVROLET, CADILLAC J CAL MG2 8271 16148228 * 1989 CHEVROLET, PONTIAC A FED MD9 8021 16138174 OLDSMOBILE, BUICK A

REMARKS: OLDSMOBILE A CAR WITH TIRE TYPES QFE/QFF/QAB/QMW ** BUICK A CAR WITH TIRE TYPES QFF/QMW/QMX **

1989 CHEVROLET, PONTIAC A CAL MD9 8031 16138179 OLDSMOBILE, BUICK A

REMARKS: OLDSMOBILE A CAR WITH TIRE TYPES QAB/QFE/QMW/QFF ** BUICK A CAR WITH TIRE TYPES QFF/QMW/QMX **

1989 CHEVROLET, PONTIAC A FED ME9 8041 16138184 OLDSMOBILE, BUICK

REMARKS: CHEVROLET, PONTIAC, OLDSMOBILE AND BUICK WITHOUT NM8 (LEADED FUEL OPTION) OLDSMOBILE A CAR WITH TIRE TYPES QAB/QFE/QFF/QMW ** BUICK A CAR WITH TIRE TYPES QFF/QMW/QMX **

1989 CHEVROLET, PONTIAC A CAL ME9 8051 16138188 OLDSMOBILE, BUICK A

REMARKS: OLDSMOBILE A CAR WITH TIRE TYPES QAB/QFE/QFF/QMW ** BUICK A CAR WITH TIRE TYPES QFF/QMW/QMX **

1989 OLDSMOBILE, BUICK A FED MD9 8061 16138193

REMARKS: OLDSMOBILE AND BUICK A CARS WITH TIRE TYPES QMB **

1989 OLDSMOBILE, BUICK A FED ME9 8071 16138197

REMARKS: OLDSMOBILE AND BUICK A CARS WITH TIRE TYPES QMB/NM8 **

1989 OLDSMOBILE, BUICK A CAL MD9 8081 16138202

REMARKS: OLDSMOBILE AND BUICK A CARS WITH TIRE TYPE QMB **

1989 OLDSMOBILE, BUICK A CAL ME9 8091 16138206

REMARKS: OLDSMOBILE AND BUICK A CARS WITH TIRE TYPE QMB **

1988 PONTIAC SEDAN A FED MD9 2401 16150336

REMARKS: PONTIAC A CAR STE MODEL (SPECIAL TOURING EDITION) Y88 (LHO ENGINE)

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

** CODES MAY BE FOUND ON SERVICE PARTS IDENTIFICATION LABEL.

LABOR OPERATION NUMBER: T1426

LABOR TIME : .7 HOURS

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.

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