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motor or tranny?

Hello folks. I've got a 92 xj (116k on body) with a motor from a 96 gc (4.0). The other day I noticed a tick, like a fan cover was hitting a blade, but alas not that easy. It seems to be coming from the motor close to the firewall. Oil pressure is good, temp is good, idles fine (other than the noise) and seems to be running on all six, but it is getting louder. When I put it in reverse it gets very loud. I hope it's not the motor, I bought this thing last Nov with 101k on it for $1100, and we love it. At 106k it blew a motor, I'm assuming the previous owner didn't treat it very well. I had the new motor put in (it was a bitch), it had 80k on it and have been putting rottella in it every 3k since, and now this. I can't afford to put another motor in it or even another xj right now (in the process of buying our first house), but this vehicle is our only car so please pray to the Jeep Gods and tell me this isn't a dead truck. It also goes in and out of part, full, and low with no problems.

Reply to
Robert Brown
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Reply to
Drink

I am thinking cracked flex plate.

Earle

Reply to
Earle Horton

If the sound diminshes as the vehicle warms up, I can almost guarantee that it is a noisy lifter. What kind of oil are you running?

Reply to
FullSizeJeep

I use Rotella. It seems to not make the noise until it is warmed up. It seems louder at idle, but with the loudness of the engine anyway it hard to tell, but I've noticed that if I coast to a stop it goes away until I get to

1000 rpm or lower. The noise doesn't get louder when I step on the gas, just faster. I am fearing the worst
Reply to
Robert Brown

Sounds like the notorious cracked 4.0 header.... doesn't "make the noise until warmed up" is a pretty good indicator of an exhaust leak IMHO. That 4.0 and the 4.2 before it are well known for leaking gaskets and cracked manifolds/headers... Small gasket leaks and cracks often don't get loud until the extremely high temp expands the manifold.

Anyway before you go nuts or tear the engine apart looking for more expensive and more complicated problems. check the exhaust... There are definitely other things it could be but I'd bet it's your exhaust.

Reply to
Simon Juncal

Reply to
Robert Brown

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