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 (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 | Compare to a known good vehicle. Inspect for a damaged or failed muffler or resonator. Replace the faulty muffler. Refer to Muffler Replacement (4.3L, 4.8L, and 5.3L Engines) or Muffler Replacement (6.0L, 6.6L, and 8.1L Engines) . |
| External rattle or vibration noise | Inspect for a bent or loose hanger, loose heat shield, or loose clamp. Inspect for a exhaust pipe causing interference. Repair or replace the affected component. Refer to the affected component's service procedure. |
| Internal rattle | Test the components by tapping with a rubber mallet to confirm a rattle. Replace the faulty catalytic converter, or muffler. Refer to one of the following procedures: Catalytic Converter Replacement (4.3L, 4.8L, and 5.3L Engines) or Catalytic Converter Replacement (6.0L and 8.1L Engines) or Catalytic Converter Replacement (6.6L Engine) Muffler Replacement (4.3L, 4.8L, and 5.3L Engines) or Muffler Replacement (6.0L, 6.6L, and 8.1L Engines) |
| CAUTION |
|---|
| While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid contacting a hot exhaust system. |
Exhaust Noise
Scheme 51
- Raise and suitably support the vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-184175-S17163319502005082200000) in General Information.
- Remove the exhaust manifold pipe nuts.
- Lower the vehicle.
- Disconnect the spark plug wires from the spark plugs.
- Remove the spark plug wire retainer bolts.
- Position the wire harness on top of the engine.
- Remove the spark plugs.
- Disconnect the engine coolant temperature (ECT) sensor electrical connector (5).
- Remove the exhaust manifold and spark plug wire shields bolts/stud.
- Remove the exhaust manifold and plug wire shields.
- Remove and discard the exhaust manifold gaskets.
- Remove the exhaust manifold heat shield bolts and shield, if required.
- Clean all gasket mating surfaces.