POPPING NOISE HEARD WITH MOVEMENT OF ENGINE. Pontiac Sunfire 1997

SUBJECT: POPPING NOISE HEARD WITH MOVEMENT OF ENGINE UNDER NORMAL CONDITIONS (RE-TORQUE TORQUE STRUT MOUNT BOLTS)

MODELS: 1995-97 BUICK SKYLARK 1995-97 CHEVROLET CAVALIER 1995-97 OLDSMOBILE ACHIEVA 1995-97 PONTIAC GRAND AM, SUNFIRE WITH 2.2L, 2.4L OR 3.1L ENGINE (VINS 4, T, M - RPOS LN2, LD9, L82)

BUILT PRIOR TO:

LOCATION DATE ======== ====

GENASYS 7/29/96 LANSING 10/1/96 LORDSTOWN 5/29/96 RAMOS ARIZPE 10/1/96

CONDITION:

SOME OWNERS MAY COMMENT ON A POPPING NOISE THAT MAY BE HEARD WITH ENGINE MOVEMENT UNDER NORMAL CONDITIONS.

CAUSE:

THE TORQUE STRUT MOUNT ATTACHING BOLTS MAY BECOME LOOSE AND THE JOINT BEGINS TO SLIP ALLOWING THE TORQUE STRUT SLEEVE TO CHUCK ON THE ATTACHING BOLTS.

CORRECTION:

INSPECT THE TORQUE STRUT MOUNT FOR EVIDENCE OF SLIPPING AROUND THE FRONT AND REAR ATTACHING BOLTS AND/OR TORQUE STRUT SLEEVES.

1. LOOSEN THE FRONT TORQUE STRUT BOLT.

2. RE-TORQUE THE BOLT TO 100 N.M (74 FT LB) + 90 DEGREES.

3. REPEAT THIS PROCEDURE FOR THE REAR TORQUE STRUT BOLT.

4. VERIFY CORRECTION.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION LABOR OPERATION NUMBER DESCRIPTION TIME =============== =========== ===============

J1520 STRUT, ENGINE MOUNTING - USE PUBLISHED REPLACE LABOR OPERATION TIME.

FIGURES: 00 ATTACHMENTS: 00

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.