For 1990-2009 cars

# FRONT FLOOR PAN NOISE DURING ACCELERATION & BREAKING

#### MODELS AFFECTED: 1982-83 Century and Skylark

A "squeak, crunch, or poppina" noise coming from the front floor pan area in some Centurys and Skylarks during acceleration and braking may be experienced. The condition is usually a single pop.

Perform one or a combination of the following steps:

1. Check cradle alignment to body, adjust if necessary. (Page 3-1 Fisher Body Service Manual)

2. The cradle mount bolt through the body to the cage nut may make contact with the body. This can be corrected by making the cage nut hole larger. (See Illustration, Point A)

3. Clear wax and rubber flash from body mount and cradle mating surfaces. The metal spacer for the mount may be contacting the cradle frame. This can be corrected by grinding or filing away sufficient material from the spacer to provide clearance, or crushing the spacer in a vise. (See Illustration, Point B)

4. The metal washer which is part of the lower insulator, may be rubbing against the underside edge of the cradle at the point illustrated, outer or side opposite which is shown in Illustration. This may be corrected by grinding or filing off sufficient material from the insulator washer or crush the neck of the lower body mount slightly in a vise between the flats. This will elongate the mount slightly in the other direction. (See Illustration, Point C)

5. Flatten the lower retainer plate slightly in a vise. This will increase the amount of clamping load on the frame. (See Illustration).

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.