Exhaust System - Rubbing Noises At Idle: Overview
Bulletin No: 01-052/09Last Issued: 12/01/2009
Subject:
UNUSUAL NOISE FROM EXHAUST SYSTEM - (CALIF. SPEC. ONLY)
BULLETIN NOTE
^ This bulletin supersedes the previous bulletin 01-026/08 issued on 04/11/08. The APPLICABLE MODEL(S)/VINS information has been revised.
^ Changes are noted below in Red beside the change bar and shown with asterisks.
APPLICABLE MODEL(S)/VINS
DESCRIPTION
Some vehicles may exhibit an unusual rubbing noise when the engine is idling, or just at the moment when the engine is shut off. The noise may be audible from inside the vehicle if one or more windows are open, or if any passenger is opening the a door to exit the vehicle.
Due to engine vibration and a lack of seal ring lubrication, the mesh in the seal ring rides in the flared portion of the catalytic converter resulting in a slight noise from the exhaust system while the engine is running. The friction between the exhaust system parts and the resulting slight noise are normal. This friction does not cause breakage, gas leakage, or other functional problems with the vehicle's exhaust system.
During normal vehicle aging, the noise level may change as the surface of the metal flange deteriorates. Usually this noise cannot be heard when the engine is running, however the noise may be heard in a quiet environment when the customer is outside the vehicle or when a door or window is open.
Customers having this concern should have their vehicle repaired using the repair procedure.
PARTS INFORMATION
WARRANTY INFORMATION
NOTE:
^ This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
^ This repair will be covered under Mazda's New Vehicle Limited Warranty term for a Powertrain Component.
^ Additional diagnostic time cannot be claimed for this repair.
NOTE: This service bulletin ONLY applies to California specification vehicles equipped with automatic transmission. This service bulletin does not apply to Mazdaspeed6 vehicles.