I have a high milage (150K) 96 Grand Cherokee 4.0 that has developed a pronounced rapping noise. It exists at all engine speeds but is most noticable at low RPM as the engine revs down. It does not seem to be load sensitive and does not vary much with engine temp. I have tried sequentially killing the spark to each cylinder with no change in noise. Anyone have any ideas on cause or diagnosis tips? Thanks...Jim Z
96 GC Engine Noise
Apr 10, 2005
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