EXHAUST MOAN/RESONANCE INSTALL DAMPER/SERVICE PROCED.. Chevrolet Corsica 1988

For 1990-2009 cars

# EXHAUST MOAN/RESONANCE INSTALL DAMPER/SERVICE PROCED.

#### Model and Year: 1987-88 L CAR WITH 2.0L (VIN CODE 1) ENGINE

Some 1987-88 L-cars with 2.0L engines (RPO LL8) may exhibit an exhaust moan/ resonance that may be detectable in the vehicle passenger compartment.

This condition may be repaired by the installation of a damper, Part Number 488974, forward of the muffler assembly in conjunction with alignment of the exhaust system.

Damper installation and alignment procedure indicated below must be followed to insure optimum results.

#### Service Procedure:

1. Raise vehicle

2. Disconnect exhaust hangers at muffler and intermediate pipe attachments and let system hang down.

3. Position damper, P/N 488974 forward of muffler assembly and secure with exhaust clamp, P/N 3634389 as shown in Illustration. Torque fasteners to 20-25 lbs.ft.

4. Elevate exhaust system and connect at rear muffler hanger. Torque fastener to 30-40 lbs. ft.

5. Connect system at front muffler hanger and torque fastener to 30-40 lbs. ft.

6. Connect at intermediate pipe hanger and torque fastener to 15-22 lbs. ft.

7. Lower vehicle.

Parts are currently available from GMSPO.

Labor Operation Number: T1533

Labor Time: 0.3 Hour

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.