[sector95]

For a rod bearing you can pull a plug wire, ground it, and run the engine.... listen for the knock.... shut it down, replace plug wire and move on to the next. Keep doing this until you don't hear the knock.... that will be the suspect cylinder. And if you do find it's a rod or main bearing gone bad? In reality, it's probably time for a new motor.....the "thick oil trick" ain't cuttin' it no mo. GM makes a 3.4L crate motor to replace the 2.8L.... it uses the intake and exhaust manifolds and all the accessories of the 2.8L... they supposedly just bolt on. It works for the S10 so I suppose it should work in your XJ.

mike