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
05-05-2011 11:53 AM
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...
05-05-2011 08:05 PM
is that common for the 4.0 tjs?
05-05-2011 08:06 PM
would that give it the rythmic soundof a "knock" ?