Knock in park not drive

[cmschulze]

I have an 05 liberty 3.7L. i have had a knock noise in engine i think. It only after warmed up and has been driven for a bit. Also in park or neutral not in gear. Replaced so far cam followers and rockers, timing chains sprockets guides and adjusters, water pump, injectors, coil packs and plugs, exhaust and two o2 sensores,serpentine belt and tensioner pulley

 

[Mhalloran]

I have an 05 liberty 3.7L. i have had a knock noise in engine i think. It only after warmed up and has been driven for a bit. Also in park or neutral not in gear. Replaced so far cam followers and rockers, timing chains sprockets guides and adjusters, water pump, injectors, coil packs and plugs, exhaust and two o2 sensores,serpentine belt and tensioner pulley

Try adding fuel injector cleaner to a full tank of gas. Is it a louder knock or just an annoying ticking? I had something that sounded like a valve tap when idling that would not go away. I read that injection cleaner might help so I tried it. It idles nice & quiet now. Hopefully this may help you ….

 

[CheddarGau]

I have an 05 liberty 3.7L. i have had a knock noise in engine i think. It only after warmed up and has been driven for a bit. Also in park or neutral not in gear. Replaced so far cam followers and rockers, timing chains sprockets guides and adjusters, water pump, injectors, coil packs and plugs, exhaust and two o2 sensores,serpentine belt and tensioner pulley

Try using a stethoscope and see if it is coming from top or bottom.