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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 261 (Engine Exhaust System) >> Diagnostic Information and Procedures >> Exhaust Noise

Exhaust Noise

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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).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 (1500 - LC9/LMG/LY5/L76)  or Muffler Replacement (1500 - LMG/LY2/LY5)  or Muffler Replacement (1500 - L92)  or Muffler Replacement (2500)  or Muffler Replacement (LFA With Norma Flange)  or Muffler Replacement (LFA Without Norma Flange) .
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:
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