Jeep Cherokee (XJ): Diagnosis and testing

Jeep Cherokee (XJ) 1984 - 2001 Service Manual > Exhaust system > Diagnosis and testing

EXHAUST SYSTEM

EXHAUST SYSTEM DIAGNOSIS CHART

CONDITION

POSSIBLE CAUSE

CORRECTION
EXCESSIVE EXHAUST NOISE OR LEAKING EXHAUST GASES
  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.
When servicing and replacing exhaust system components, disconnect the oxygen sensor connector(s). Allowing the exhaust to hang by the oxygen sensor wires will damage the harness and/or sensor.

    Previous pageDescription and operation

    Exhaust system DESCRIPTION The basic exhaust system consists of exhaust manifold( s), exhaust pipe with oxygen sensors, catalytic converter(s), heat shield(s), muffler and tailpipe (Fig. 1) (Fig. ...

    Next pageRemoval and installation

    Exhaust pipe WARNING: IF TORCHES ARE USED WHEN WORKING ON THE EXHAUST SYSTEM, DO NOT ALLOW THE FLAME NEAR THE FUEL LINES. CAUTION: When servicing exhaust system components, disconnect the oxygen s ...

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    Service procedures
    LUBRICANT CHANGE (1) Raise and support the vehicle. (2) Remove the lubricant fill hole plug from the differential housing cover. (3) Remove the differential housing cover and drain the lubricant from the housing. (4) Clean the housing cavity with a flushing oil, light engine oil, or lin ...