Thunking Noise?

[AshTraY88XJ]

I've got like a low thunking noise coming from the front end. I can only hear from sitting inside, and I can only hear it when i'm sitting still, it does it in park, reverse, or drive. I can also feel it just a little. Anyone else had this problem?

 

[wrangler00]

does it do it when you turn the wheel or all the time?

 

[RenegadeT]

sitting still? that pretty much rules out suspension and driveshaft U-joints. Is it just while idling or reving up engine. Just idling points to the engine/trans itself...cam, lifters, crank knock, or flexplate bolts, maybe something on the belt drive. If reving the engine can cause it, also check the engine mounts and tranny mount.

 

[RockinXJ]

I had a strange thunk only in 4WD low. It ended up to be a driver side motor mount, the torque was causing it to be a metal on metal contact causing the THUNK.

 

[krehel24]

run it up to 2500 rpm if you hear real good then, you got rod knock

 

[AshTraY88XJ]

Well it's definitly not a rod knocking, I rev it up and it pretty much goes away, It does idle a little rough but not to the point where it's rocking the engine back and forth.