Exhaust - Moan Noise

9232oldsmobile06

NUMBER: 92-T-90

CORP. REF.NO: 236601

DATE: May 1992

SECTION: 6F


SUBJECT:
EXHAUST MOAN NOISE
- REVISED INTERMEDIATE EXHAUST HANGER


MODELS/YEARS:
1992 ACHIEVA
WITH 3.3L (VIN N) ENGINE


CONDITION:
Some 1992 Achievas may exhibit a "moan" type noise which may be heard throughout the passenger compartment of the vehicle. This noise is especially noticeable in the 2400-2500 engine RPM range.

CAUSE:
The intermediate exhaust pipe hanger may not be properly isolating the exhaust systems vibrations at these engine speeds.

CORRECTION:
Starting in early January, production vehicles were being assembled with a revised style intermediate exhaust hanger. The revised hanger may reduce the amount of vibration which could cause a "moan" type noise. The revised hanger may be used for service when addressing customer concerns.

Early production vehicles built before vehicle number NM407650 have the original style of intermediate exhaust hanger. These vehicles may require the revised hanger:

Procedure: (Does not require any modifications)
1. Raise vehicle.
2. Remove original intermediate exhaust hanger.
3. Install revised hanger P/N 22577467 (Tighten to 27 N-m or 20 lbs.ft.).
4. Lower vehicle.

Parts are currently available from GMSPO.