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Old 05-04-2011, 08:42 PM   #1
Join Date: Apr 2011
Posts: 90
wanting to know if im the only jeeper....

that has a knocking sound .. it isnt terribly loud and is low piched almost hollow sounding. and goes away when car is warm . professionally diagnosed as piston slap but ive been told the 4.0 exhaust sounds like that. just wondering if im the only one?! (:

it almost sounds like a diesel lol

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Old 05-05-2011, 11:53 AM   #2
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sounds to me it may be your exhaust manifold... when it heats up the cracks if not severe they may re seal... i suggest an inspection of your exhaust manifold... If I am wrong someone will chime in and correct me...

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Old 05-05-2011, 08:05 PM   #3
Join Date: Apr 2011
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is that common for the 4.0 tjs?
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Old 05-05-2011, 08:06 PM   #4
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would that give it the rythmic soundof a "knock" ?
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