Exhaust System - Ping/Crackle/Snap Noise On Cool Down

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 02-06-05-001

Date: February, 2002

TECHNICAL

Subject:
Exhaust System Ping/Crackle/Snap Noise During Cool Down
(Replace Exhaust System Rearward of Catalytic Convertor)

Models:

2000-02 Buick Century
2000-02 Pontiac Grand Prix
with 3.1 L V6 Engine (VIN J, RPO LG8)

Condition

Some owners may comment on a ping/crackle/snap type noise that is audible for a short period of time after the engine is turned off. Typically, this noise is most apparent when the vehicle is being parked in a garage and may be detected from either the passenger compartment or from outside the vehicle.

Cause

This condition may be caused by the thermal related contraction/expansion of the resonator internal layers.

Correction





Replace the existing exhaust system muffler assembly, which includes the resonator, exhaust and tail pipes, with the applicable new assembly and a new catalytic converter gasket indicated below in Parts Information by vehicle model. To ensure correct installation, follow the applicable procedure contained in SI2000 as indicated in the chart.





Parts Information

Parts are currently available from GMSPO.

Warranty Information





For vehicles repaired under warranty. use the table.





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