Exhaust System Diagnosis

CONDITION	POSSIBLE CAUSES	CORRECTION
EXCESSIVE EXHAUST NOISE (UNDER HOOD)	1. Exhaust manifold cracked or broken.	1. Replace manifold.
	2. Manifold to cylinder head leak.	2. Tighten manifold and/or replace gasket.
	3. Exhaust flex joint to manifold leak.	3. Tighten fasteners or replace gasket.
	4. Exhaust flex joint.	4. Replace catalytic converter assembly.
	5. Pipe and shell noise from front exhaust pipe.	5. Characteristic of single wall pipes.
EXCESSIVE EXHAUST NOISE	1. Leaks at pipe joints.	1. Tighten or replace clamps at leaking joints.
	2. Burned, blown, or rusted out exhaust pipe or muffler.	2. Replace muffler or exhaust pipes.
	3. Restriction in muffler or tailpipe.	3. Remove restriction, if possible or replace as necessary.
	4. Catalytic converter material in muffler.	4. Replace muffler and converter assembly. Check fuel injection and ignition systems for proper operation.