SHOCK GROAN ON 25MM NON-GAS CHARGED REAR SHOCKS

Subject: SHOCK GROAN ON 25MM NON-GAS CHARGED REAR SHOCKS (REPLACE SHOCK ASSEMBLIES)

Model and Year: 1991-93 CAVALIER, CORSICA AND BERETTA

CONDITION:

Some rear shocks may exhibit a groaning noise after the vehicle has been sitting stationary for an extended period of time. Shock groan usually disappears after driving the vehicle a short distance. This shock groan condition is sensitive to temperature and humidity.

CAUSE:

As the vehicle sits stationary for a next ended period of time, the oil film on the shock rod dries. When this occurs, the shock rod and seal interface is dry during the first several compressions/extensions. As the shock begins to become lubricated, this condition disappears.

CORRECTION:

Allow vehicle to sit idle overnight. Before driving or moving the vehicle, press down on the rear bumper. If a groan is detected, install two shock absorber assemblies.

Replace shock assemblies with gas charged shocks (P/N 22064490). These shocks contain pre-lubricated seals which will not exhibit shock groan.

Parts are expected to be available on May 3, 1993.

Labor Operation Number: E-5807

Use applicable labor time guide for labor hours.

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.