Caution: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.

DEFINITION: An audible or physical noise due to a faulty component or damaged components causing a loose or misaligned exhaust system resulting in a rattle or vibration noise (buzz, groan, hum).

Refer to Symptoms - Engine Exhaust prior to beginning this table.

Popping or hissing noise

Exhaust leak. Refer to Exhaust Leakage .

Loud exhaust

1. Compare to a known good vehicle.
2. Inspect for a damaged or failed muffler or resonator.
3. Replace the faulty muffler. Refer to Muffler Replacement .

External rattle or vibration noise

1. Inspect for a bent or loose hanger, loose heat shield, or loose clamp.
2. Inspect for a exhaust pipe causing interference.
3. Repair or replace the affected component. Refer to the affected component's service procedure.

Internal rattle

1. Test the components by tapping with a rubber mallet to confirm a rattle.
2. Replace the faulty catalytic converter, or muffler. Refer to one of the following procedures:

•	Catalytic Converter Replacement

•	Muffler Replacement