Jeep Cherokee (XJ): Diagnosis and testing

CONDITION

POSSIBLE CAUSE

CORRECTION

1. Leaks at pipe joints.
2.  Rusted or blown out muffler.
3.  Broken or rusted out exhaust pipe.
4.  Exhaust pipe leaking at manifold flange.
5.  Exhaust manifold cracked or broken.
6.  Leak between exhaust manifold and cylinder head.
7.  Catalytic converter rusted or blown out.
8.  Restriction in exhaust system.

1.  Tighten clamps/bolts at leaking joints.
2.  Replace muffler. Inspect exhaust system.
3.  Replace exhaust pipe.
4.  Tighten/replace flange attaching nuts/bolts.
5.  Replace exhaust manifold.
6.  Tighten exhaust manifold to cylinder head bolts.
7.  Replace catalytic converter assy.
8. Remove restriction, if possible. Replace restricted part if necessary.