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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 707 (Engine Exhaust System) >> Diagnostic Information and Procedures >> Exhaust Noise

Exhaust Noise

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Exhaust Noise

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, 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 (RPO L61)  or Muffler Replacement (RPOs LE5/LSJ) .
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:
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