Engine knock

JEEP CHEROKEE
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ROGERTECH1
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1996 grand cherokee limited 4.0 I6 148,609 miles When the outside temp is cold, my engine has a knock during acceleration.When it gets warm it dont doit. My wife has been driving for 4 years I have no idea how long it has been going on. I had a friend use stethoscope he said all sounded goos while idling
Apr 30, 2007 at 9:20 AM
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MERLIN2021
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A knock of a bad wrist pin or connecting rod will quiet down when warm, but a trained ear will still detect it!
May 4, 2007 at 5:25 PM