ENGINE VIBRATION AT IDLE OR CLUNK NOISE AT LAUNCH

SUBJECT: ENGINE VIBRATION AT IDLE OR CLUNK NOISE AT LAUNCH (REPLACE ENGINE MOUNT)

MODELS: 1993-94 CHEVROLET CAVALIER 1993-94 PONTIAC SUNBIRD

ENGINE APPLICATIONS: 2.2L (VIN 4 - RPO LN2) 2.0L (VIN H - RPO LE4) 3.1L (VIN T - RPO LH0) WITH 3T40 (MD9) AND ISUZU 5 SPEED (MK7)

CONDITION:

SOME OWNERS MAY EXPERIENCE ENGINE VIBRATION AT IDLE OR CLUNK NOISE AT LAUNCH.

CAUSE:

RIGHT REAR ENGINE MOUNT SAGGING.

CORRECTION:

INSPECT RIGHT REAR ENGINE MOUNT WHILE IN VEHICLE FOR LESS THAN 5MM GAP.

IF GAP CHECKED IN DIAGNOSIS IS LESS THAN 5MM, INSTALL THE PROPER REPLACEMENT ENGINE MOUNT AS FOLLOWS:

ALL 2.2L (LN2) AND 2.0L (LE4) USE P/N 22637949.

3.1L (LH0 WITH MD9 ONLY) USE P/N 22637950.

1. INSTALL NEW ENGINE MOUNT AND ONLY TIGHTEN BOLTS FINGER TIGHT TO ALLOW SEATING OF ENGINE.

2. INSTALL ENGINE MOUNT BRACKET BOLTS ONLY FINGER TIGHT.

3. LOOSEN TRANSAXLE MOUNT TO TRANSAXLE MOUNT BRACKET BOLT AND THE TWO NUTS HOLDING THE SNUBBER BLOCK ON THE MOUNT ITSELF.

4. BLOCK WHEELS.

5. SET PARKING BRAKE AND START ENGINE.

6. SHIFT FROM REVERSE TO DRIVE SEVERAL TIMES TO SEAT THE ENGINE AND TRANSAXLE ASSEMBLY.

7. TURN IGNITION SWITCH TO "OFF" POSITION.

8. TIGHTEN TRANSAXLE MOUNT TO TRANSAXLE MOUNT BRACKET BOLT, REFER TO SERVICE MANUAL.

9. TIGHTEN ENGINE MOUNT BRACKET TO BODY BOLTS, REFER TO SERVICE MANUAL.

10. TIGHTEN ENGINE MOUNT TO ENGINE MOUNT BRACKET NUTS, REFER TO SERVICE MANUAL.

11. CENTER THE SNUBBER BLOCK ON THE TRANSAXLE MOUNT (TRANSAXLE IN "NEUTRAL"), THEN TIGHTEN THE TWO NUTS HOLDING THE SNUBBER BLOCK TO MOUNT.

PARTS ARE EXPECTED TO BE AVAILABLE ON MAY 2, 1994.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION NUMBER: J1510 LABOR TIME: 0.8 HR ADD: 0.2 HR (FOR INSPECTION) ADD: 0.2 HR (TO LOOSEN/TIGHTEN TRANSAXLE MOUNTS)

FIGURES: 1

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 1994 GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.