ROOF CREAK NOISE DIAGNOSIS AND REPAIR

ROOF CREAK

VEHICLES AFFECTED: 1984-87 FIERO MODELS ------------------

CAUSE:

------ Roof fasteners on some 1984-1987 Fieros could lose some torque/clamp load over time due to body flex; loss of clamp load allows for roof movement; resultant motion combined with plastic panel to spaceframe contact produces the creak.

CORRECTION:

----------- 1. Remove headliner from car. (Refer to 1987 Fiero Service Manual, page 8J- 3.)

2. Retorque bolts around center perimeter of vista vent region to 10 N.m. These bolts will already have a threadlocker applied to them and should maintain proper torque (refer to Figure 1).

3. Remove nuts around outside perimeter of roof. Apply a drop of GM Thread Locking Adhesive 993363 or equivalent to the inside of the nut. Retorque nut to 10 N.m. (refer to Figure 1).

4. Reinstall headliner using the procedure on page 8J-3 of the 1987 Fiero Service Manual.

NOTICE: Procedure will be used in production beginning with 1988 model. Before implementing this procedure, be certain that the condition is not caused by the drip rail molding creak (reference bulletin 86-2-160 dated 9/22/86).

CORRECTION - WITH VISTA VENT:

1. Perform above steps.

2. Per Figure 2, lift vista vent seal at area of hinges and drill two (2) 1/8" diameter holes forward and inboard of each existing vista vent hinge rivet (2 holes per side).

3. Install two (2) 1/8" x 1/2" steel pop rivets in previously drilled holes.

4. Reseal vista vent seal.

5. On 1986-87 GT models only, perform portion of service bulletin 86-2-160 pertaining to drip rails.

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.