Exhaust - Buzzing Noise From Pipe A

May 13, 1997

BULLETIN NO.
97-020

Buzzing Noise From Exhaust Pipe A

SYMPTOM

Exhaust pipe A buzzes between 3,000 and 5,000 rpm.

PROBABLE CAUSE

The inner pipe vibrates against the outer pipe.

VEHICLES AFFECTED

1994-96: ALL
1997: 3-door thru VIN JH4DC2...VS003512
4-door thru VIN JH4DB8...VS000732

CORRECTIVE ACTION

Replace exhaust pipe A and its mounting hardware.

PARTS INFORMATION

Exhaust Pipe A: P/N 18210-ST7-A63

Rear Exhaust Gasket: P/N 18229-SH3-X30

Front Exhaust Gasket (2 required):
P/N 18212-582-961

Self-Locking Nut, 10 x 1.25 mm (5 required):
P/N 90212-SA5-003

Self-Locking Nut, 8 x 1.25 mm (2 required):
P/N 90115-659-003

WARRANTY CLAIM INFORMATION

In warranty:
The normal warranty applies.

Operation number: 311123

Flat rate time: 0.6 hour

Failed P/N: 18210-ST7-A63

Defect code: 042

Contention code: B07

Template ID: 97-020A

Skill level: Repair Technician

Out of warranty:
Any repair performed after warranty expiration may be eligible for goodwill consideration by the District Technical Manager or your Zone Office. You must request consideration, and get a decision, before starting work.

DIAGNOSIS

1. Warm the engine to normal operating temperature.

2. Rev the engine between 3,000 and 5,000 rpm, and listen for a steady buzzing noise from exhaust pipe A; if you hear it, continue to REPAIR PROCEDURE.

REPAIR PROCEDURE

1. Raise the vehicle, and let the exhaust system cool for at least 30 minutes.





2. Remove and discard the seven self-locking nuts from exhaust pipe A.

3. Remove the pipe and the three exhaust gaskets.

4. Install the new pipe in the reverse order of removal. using new exhaust gaskets and self-locking nuts.

5. Start the engine, and confirm that the noise is gone.