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, i.e. 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.
3. Replace the faulty muffler. Refer to Muffler Replacement or Mid Muffler Replacement.

External rattle or vibration noise

1. Inspect for a bent or loose hanger, loose heat shield, or loose clamp.
2. Inspect for an 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 or Auxiliary Catalytic Converter Replacement

•	Muffler Replacement or Mid Muffler Replacement