Roof - Creaking Noise
88pontiac01Number 87-10-33 Date 1/88
Subject: ROOF CREAK
1984-87 FIERO MODELS
CAUSE:
Roof fasteners on some 1984-1987 Fieros could lose 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.
FIGURE 1:
CORRECTION - WITHOUT VISTA VENT:
1. Remove headliner from car. (Refer to 1987 Fiero Service Manual, page 8J-3.)
2. Retorque bolts around 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 Loctite 242 serviceable threadlocker (P/N 12345382) 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 86-10-12).
FIGURE 2:
CORRECTION - WITH VISTA VENT:
1. Perform above steps.
2. Per Figure 2, lift vista vent seal at area of hinges and drill 2 1/8" diameter holes forward and inboard of each existing vista vent hinge rivet (2/side).
3. Install 2-1/8" x 1/2" steel pop rivets in previously drilled holes.
4. Reseat vista vent seal.
5. On 1986-87 GT models only, perform portion of service bulletin 86-10-12 pertaining to drip rails.