D Oil Canning/Popping Noise

(D) OIL CANNING/POPPING NOISE

CONDITION: I
Oil canning/popping noise from rear of vehicle noted during normal vehicle operation (1988-89 vehicles) built prior to VIN # K1418999.

CAUSE:
Normal internal fuel tank pressure results in oil canning noise.

CORRECTION:
Replace fuel tank with new service tank, P/N 12516117, that has additional ribbing on upper and lower tank sections (Reference Bulletin # 89-6C-6).


CONDITION:
II Thumping/squawk noise from rear of vehicle, and most apparent when operated at low speeds over irregular road surfaces. (1989-92 vehicles)

CAUSE:
A load spike caused by the strut jounce bumper system transmitting noise through the body strut tower structure.

CORRECTION:
Replace both rear strut jounce bumper assemblies with new assemblies contained in service unit, P/N 22063945 (Reference Bulletin # 92-3-7).