SERVICE OF GM GOODWRENCH ENGINES. Chevrolet Corsica 1990

REVISION: 07/20/94

THIS BULLETIN IS REVISED TO ADD THE 1993 AND 1994 MODEL YEARS TO THE QUAD-4 GOODWRENCH SERVICE ACTIVITY. PREVIOUS DIVISIONAL PUBLICATION NUMBERS WERE:

CHEVROLET 92-337-6 BUICK 91-6-9 OLDSMOBILE 93-I-09 CANADA 93-6A-114 ----------------------------------------------------------------------

SUBJECT: INFORMATION ON QUAD-4 GOODWRENCH ENGINE SERVICE

MODELS: 1987-91 OLDSMOBILE CUTLASS CALAIS 1988-91 BUICK SKYLARK 1988-94 PONTIAC GRAND AM 1990-91 PONTIAC GRAND PRIX 1990-94 CHEVROLET BERETTA 1992-94 OLDSMOBILE ACHIEVA WITH 2.3L ENGINE (VINS A AND D - RPOS LG0 AND LD2)

1992-94 2.3L (VINS A AND D - RPOS LG0 AND LD2) GM GOODWRENCH ENGINES WILL REPLACE THE 1987-93 2.3L (VINS A AND D - RPOS LG0 AND LD2) SERVICE REPLACEMENT ENGINE ASSEMBLIES AS SERVICE INVENTORY IS EXHAUSTED.

2.3L PARTIAL ENGINES ARE NO LONGER AVAILABLE. USE THE GM GOODWRENCH ENGINE TO SERVICE ENGINES PREVIOUSLY SERVICED WITH A PARTIAL ENGINE.

AN ECM CALIBRATION KIT IS REQUIRED WHEN REPLACING 1987-89 2.3L (VIN D) ENGINES WITH A 1992-94 GM GOODWRENCH ENGINE. THIS KIT CONTAINS A NEW EPROM (MEM-CAL), A CRANKCASE VENT HOSE CONNECTOR, INSTRUCTION SHEET, ECM PROM (MEM-CAL) ACCESS DOOR LABEL AND TWO (2) 10 MM EXHAUST MANIFOLD RETAINING NUTS THAT ARE REQUIRED TO ADAPT THE 1992-94 ENGINE TO THE 1987-89 APPLICATIONS.

FOR ANY FUTURE EPROM (MEM-CAL) REPLACEMENT, BE SURE THAT THE REPLACEMENT EPROM (MEM-CAL) IS THE CORRECT APPLICATION FOR THE GOODWRENCH ENGINE ASSEMBLY.

PARTS INFORMATION:

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

AN ECM CALIBRATION KIT IS REQUIRED FOR 1992-94 GM GOODWRENCH ENGINES WHEN USED IN 1987-89 APPLICATIONS. ECM CALIBRATION KITS ARE NOT REQUIRED FOR 1989 2.3L (VIN A) OR ANY 1990-94 APPLICATIONS.

DIVISION/ ENGINE VIN/ B/C SCAN EPROM CAL. KIT YEAR MODEL TRANS EMISSION CODE I.D. PART NUMBER ---- --------- ----------- -------- ---- ---- -------------- 1987 OLDS / N D / AUTO FEDERAL BAUU 6303 12354563

1987 OLDS / N D / AUTO CALIF. BAUX 6323 12354565

1988 BUICK/OLDS/ D / AUTO FEDERAL BAUU 6303 12354563 PONT / N

1988 BUICK/OLDS/ D / MANUAL FEDERAL BAUW 6313 12354564 PONT / N

1988 BUICK/OLDS/ D / AUTO CALIF. BAUX 6323 12354565 PONT / N

1988 BUICK/OLDS/ D / MANUAL CALIF. BAUY 6333 12354566 PONT / N

1989 BUICK/OLDS/ D / AUTO FEDERAL BAUZ 6343 12354567 PONT / N

1989 BUICK/OLDS/ D / MANUAL FEDERAL BAWA 6353 12354568 PONT / N

1989 BUICK/OLDS/ D / AUTO CALIF. BAWB 6363 12354569 PONT / N

1989 BUICK/OLDS/ D / MANUAL CALIF. BAWC 6373 12354570 PONT / N

THE ABOVE ENGINE REPLACEMENT KITS WERE DEVELOPED AND CERTIFIED FOR PROPER ENGINE OPERATION, PERFORMANCE, AND EMISSION REQUIREMENTS AND MUST ONLY BE USED TO ADAPT 1992-94 GOODWRENCH ENGINES TO THE APPLICATIONS NOTED.

THE FOLLOWING SUMMARIZES THE MOST SIGNIFICANT CHANGES AMONG THE VARIOUS MODEL YEAR (VIN D) ENGINES. COMPONENTS ARE NOT GENERALLY INTERCHANGEABLE BETWEEN MODEL YEARS.

1. CYLINDER HEAD DESIGN * 1987-98 INTERCHANGEABLE FOR THESE MODEL YEARS ONLY. * 1990-93 INTERCHANGEABLE FOR THESE MODEL YEARS ONLY. * 1994 USED FOR THIS MODEL YEAR ONLY DUE TO INLET THERMOSTAT DESIGN.

2. CRANKSHAFT RELUCTOR INDEX * 1987-88 0 DEGREES. * 1989-94 15 DEGREES.

3. KNOCK SENSOR (ELECTRONIC SPARK CONTROL - ECS) SYSTEM CALIBRATION * SPECIFIC CALIBRATION FOR EACH MODEL YEAR (INVOLVING EMISSIONS, KNOCK AND SPARK CALIBRATIONS).

4. ELECTRONIC IGNITION MODULE ASSEMBLY * 1987-88 INTERCHANGEABLE FOR THESE MODEL YEARS ONLY. * 1989-92 INTERCHANGEABLE FOR THESE MODEL YEARS ONLY. * 1993-94 INTERCHANGEABLE FOR THESE MODEL YEARS ONLY.

5. INTAKE MANIFOLD * 1987-89 INTERCHANGEABLE FOR THESE MODEL YEARS ONLY. * 1990-94 INTERCHANGEABLE FOR THESE MODEL YEARS ONLY.

WARRANTY INFORMATION:

LABOR OPERATION: J1840 - ENGINE, UNIVERSAL - REPLACE J6364 - EPROM (CALIBRATOR, PROM) - REPLACE USE PUBLISHED LABOR OPERATION TIMES.

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.