For 1990-2009 cars only
Noise Diagnosis - Under Vehicle Exhaust Hanger Rattle
Exhaust Hanger Rattle
Symptom:
Rattle from the underside of the vehicle.
Possible Cause:
The slots on the exhaust hangers increase in size over time.
Diagnosis:
Visual inspection for excessive gap in exhaust hanger where exhaust system blade is inserted.
Corrective Action:
Replace hanger(s).
Noise Diagnosis - Under Vehicle Exhaust Pipe Rattle
Exhaust Pipe Rattle
Symptom
Underbody rattle.
Possible Cause
The exhaust system intermediate pipe is hitting the cross brace.
Diagnosis
Look for witness marks on the pipe and cross brace. Minimum clearance between the pipe and the brace should be:
| • | For the 3800 V6 the specification is 19.0 mm (0.748 in) |
| • | For the 5.7L V8 the specification is 14.0 mm (0.551 in) |
Corrective Action
| • | Reposition exhaust system to provide minimum clearance using the above specifications. |
| • | Loosen the slip joint, converter bracket hanger and take down pipe to manifold. |
| • | Raise exhaust system with a single post jack. |
| • | Retighten the system starting with the converter bracket, then tighten the take downs at the manifolds, lastly tighten the pipe clamp. |
Noise Diagnosis - Under Vehicle Rear Suspension Clunk
Rear Suspension Clunk
Symptom
A clunk is heard in the rear of the vehicle.
Possible Cause
| • | Spring isolator is mispositioned. |
| • | A rear suspension component is not tighten to specification. |
Diagnosis
| • | Visually inspect the isolator position on top of the spring. The spring tail end should be pointed forward. |
| • | Check all rear suspension attachments for proper torque. |
Corrective Action
Tighten all bolts, nuts to specifications.
