EXHAUST MOAN/HOOT (INSTALL DAMPER). Buick Regal 1994

SUBJECT: EXHAUST MOAN/HOOT (INSTALL DAMPER)

MODELS: 1994 BUICK REGAL 1993-94 OLDSMOBILE CUTLASS SUPREME 1994 PONTIAC GRAND PRIX 1995 CHEVROLET LUMINA AND MONTE CARLO WITH 3.1L V6 ENGINE (VIN M - RPO L82)

CONDITION:

SOME CUSTOMERS MAY COMMENT ON AN EXHAUST HOOT/MOAN AUDIBLE IN THE VEHICLE PASSENGER COMPARTMENT ON VEHICLES WITH SINGLE OR DUAL EXHAUST. THIS CONDITION IS APPARENT WHEN THE ENGINE IS OPERATED IN THE 1000- 1100 OR 1800-2000 RPM RANGES AFTER A COLD START.

CAUSE:

VEHICLE EXHAUST SYSTEM EXCITED BY ENGINE EXHAUST PULSE INDUCED VIBRATION.

CORRECTION:

INSTALL DAMPER, P/N 10137383, USING EXHAUST PIPE CLAMP, P/N 10114791, FOLLOWING THE PROCEDURE INDICATED BELOW.

SERVICE PROCEDURE

1. RAISE VEHICLE.

2. POSITION EXHAUST PIPE CLAMP, P/N 10114791, 17.5" REARWARD OF THE RESONATOR HANGER ROD WITH STUD PORTION OF CLAMP POINTING VERTICALLY UPWARD (FIGURE 1).

3. TORQUE CLAMP NUTS TO 51 N.M (38 LB. FT.) AND INSURE AT LEAST 1" OF CLEARANCE IS BETWEEN THE CLAMP AND FUEL TANK.

NOTE: VISIBLE DEFORMATION OF THE PIPE WILL OCCUR, ENSURING THAT CLAMP WILL NOT ROTATE.

4. INSTALL DAMPER, P/N 10137383, ONTO THE OUTBOARD STUD OF THE EXHAUST CLAMP (STUD FARTHEST FROM FUEL TANK). SECURE THE DAMPER TO CLAMP USING AN OPEN-END WRENCH.

5. INSPECT AND INSURE AT LEAST 1" CLEARANCE IS MAINTAINED BETWEEN THE DAMPER AND FUEL TANK AND BETWEEN THE DAMPER AND THE PATH OF THE REAR SUSPENSION LATERAL LINK (FIGURE 1).

6. LOWER VEHICLE.

PART AVAILABILITY:

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE: LABOR OPERATION: L2008 LABOR TIME: 0.3 HR.

FIGURES: 1

Object Number: 84079 Size: FS

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.