EXHAUST MOAN/RATTLE (INSTALL DAMPER & WASHER)

SUBJECT: EXHAUST MOAN/RATTLE - INSTALL DAMPER AND WASHER

MODELS/YEARS: 1991-92 CUTLASS CIERA

CONDITION: Some 1991-92 Cutlass Ciera sedans with 3300 (VIN N) engines (RPO LG7) may exhibit an exhaust moan and/or metallic rattle/buzz audible in the vehicle passenger compartment. The moan condition is most apparent when the engine is operated in the 1500-1700 RPM range, while the metallic rattle/ buzz may be detected when the throttle is moved off idle with the vehicle stationary.

CAUSE:

------- EXHAUST MOAN - Catalytic converter resonance is transmitted through intermediate pipe exhaust hanger into vehicle floor pan.

METALLIC RATTLE/BUZZ - Intermediate pipe hanger shoulder bolt is vibrating against the hanger bushing.

CORRECTION:

----------- EXHAUST MOAN - Install damper, P/N 10137383 utilizing exhaust pipe clamp, P/N 15595048.

Note: Clamp is supplied with two nuts, only one will be utilized for this installation.

METALLIC RATTLE/BUZZ - Install wavy washer, P/N 368274 on intermediate pipe hanger shoulder bolt.

Parts are currently available from GMSPO.

Service Procedure:

1. Raise vehicle. 2. Remove intermediate pipe hanger bracket to hanger shoulder bolt/screw. 3. Remove muffler to hanger bolt/screw and lower exhaust system. 4. Install and position damper, P/N 10137383 and clamp, P/N 15595048 as shown in the illustration on the back of this bulletin, insuring damper is parallel to ground. Torque damper and clamp nut to 42 Nm (30 ft.lbs.). 5. Elevate exhaust system and install muffler to hanger bolt/screw and torque to 17 Nm (13ft.lbs.). 6. Place wavy washer, P/N 368274 onto hanger bracket to hanger shoulder bolt/screw, install and torque to 27 NM (20 ft. lbs.). 7. Lower vehicle.

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.