Diagnosis And Testing
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EXHAUST SYSTEM DIAGNOSIS CHART
| CONDITION | POSSIBLE CAUSE | CORRECTION |
|---|---|---|
| EXCESSIVE EXHAUST NOISE | 1. Leaks at pipe joints. | 1. Tighten flanges to specified torque at leaking joints. Refer to TORQUE SPECIFICATIONS . |
| 2. Burned, rusted-out, or blown out muffler. | 2. Replace muffler/tailpipe assembly. Refer to MUFFLER, EXHAUST, REMOVAL . Check exhaust system. | |
| 3. Burned or rusted-out exhaust pipe. | Replace exhaust pipe. | |
| 4. Exhaust pipe leaking at manifold flange. | 4. Tighten connection attaching nuts. Refer to TORQUE SPECIFICATIONS . | |
| 5. Exhaust manifold cracked or broken. | 5. Replace exhaust manifold. Refer to MANIFOLD, EXHAUST, REMOVAL, 5.7L , MANIFOLD, EXHAUST, REMOVAL, 6.2L or MANIFOLD, EXHAUST, REMOVAL, 6.4L . | |
| 6. Leak between exhaust manifold and cylinder head. | 6. Tighten exhaust manifold to cylinder head stud nuts or bolts. Refer to TORQUE SPECIFICATIONS, 5.7L , TORQUE SPECIFICATIONS, 6.2L or TORQUE SPECIFICATIONS, 6.4L . | |
| 7. Restriction in muffler or tailpipe. | 7. Remove restriction, if possible. Replace muffler or tailpipe, as necessary. | |
| 8. Exhaust system contacting body or chassis. | 8. Re-align exhaust system to clear surrounding components. | |
| 9. Exhaust valve stuck open. | 9. Clean spring and joints. Replace the exhaust pipe, as necessary. | |
| LEAKING EXHAUST GASES | 1. Leaks at pipe joints. | 1. Tighten the flanges. Refer to TORQUE SPECIFICATIONS . |
| LACK OF POWER | 1. Exhaust valve stuck closed. | 1. Clean spring and joints. Replace the exhaust pipe, as necessary. |
| 2. Restriction in muffler or tailpipe. | 2. Remove restriction, if possible. Replace muffler or tailpipe, as necessary. | |
| 3. Restriction in catalytic converter or diesel particulate filter. | 3. Remove restriction, if possible. Replace catalytic converter or diesel particulate filter, as necessary. | |
| EXHAUST FUMES ENTERING INTO VEHICLE | 2. Quarter panel exhauster not sealing properly or broken. | 2. Repair or replace the quarter panel exhauster. Refer to EXHAUSTER, QUARTER PANEL, REMOVAL . |
| 1. Exhaust leak at turbocharger flanges (diesel engine). | 1. Replace the flange gasket. |