GM Service Manual Online
For 1990-2009 cars only

Condition

Action

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).

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 or resonator. 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 Catalytic Converter Replacement or Muffler Replacement .