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Exhaust Leakage

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Exhaust Leakage

Problem Action
CAUTION: While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system.
DEFINITION: An exhaust leak may show stains at the area of the leak. The leak may be felt by holding a hand close to the suspected areas or using a smoke pencil. The leak may make a popping or hissing noise.Refer to Symptoms - Engine Exhaust  prior to beginning this table.
Misaligned or improperly installed exhaust system components.
Exhaust leaks at the following connections:
  • Exhaust manifold to pipe
  • Flanges
  • Pipe clamps
 Tighten the components to the specifications.
Refer to Fastener Tightening Specifications .
Seals or gaskets leaking.
  • Exhaust manifold to cylinder head
  • Exhaust pipes to exhaust manifold
  • Catalytic converter connection
  • EGR connections
  • AIR connections to the exhaust manifold or cylinder head
 Replace the leaking seal or gasket. Refer to the affected components procedure for service.
Irregularities at the mating surfaces on the flange connections. Repair as required or replace the affected component. Refer to the affected components procedure for service.
Exhaust manifold cracked or broken. Replace the exhaust manifold
Refer to Exhaust Manifold Replacement - Left (4.3L Engine)  or Exhaust Manifold Replacement - Left (4.8L, 5.3L, and 6.0L Engine)  or Exhaust Manifold Replacement - Left (6.6L (LB7) Engine)  or Exhaust Manifold Replacement - Left (6.6L (LLY) Engine) Exhaust Manifold Replacement - Left (8.1L Engine)  or Exhaust Manifold Replacement - Right (4.3L Engine)  or Exhaust Manifold Replacement - Right (4.8L, 5.3L, and 6.0L Engines)  or Exhaust Manifold Replacement - Right (6.6L (LB7) Engine)  or Exhaust Manifold Replacement - Right (6.6L (LLY) Engine)  or Exhaust Manifold Replacement - Right (8.1L Engine) .
Exhaust system component connection welds leaking. Replace the leaking component. Refer to the affected component's procedure for service.
Muffler or resonator (if equipped) damaged or leaking at the seams. Replace the affected muffler or resonator. Refer to one of the following procedures:
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