2001 4.0 Cherokee sport 4x4 80k miles
When the engine is cold there is no noise but when it warms up to operating temp 190-200 there is this light knocking noise that is loudest in the cab center right of the dash. When I open the hood and listen at the front its not noticeable. I thought it might be the valves but I don't think so. Its more of a knocking not ticking like valves. The engine runs smooth and has plenty of power. When the engine is idling it is most noticeable. As I accelerate I cant hear it.
After coming to a stop the transm. kinda clunks upon acceleration, don't know if its usual for this or not. Might be the nature of the beast. First Jeep that I have owned. Not to familiar with it. Let me know if you need more info. Thanks.

 

Ill tell you this not because I know a lot about Jeeps, I do own one and love working on it and am becoming more and more addicted to it.

From what I have read here it seems every Jeep is a little different and has its own little sounds/taps/ticks etc. Mine makes so many different noises it sounds like a chorus. I am slowly chiseling down the sounds.

As of right now my crank pully taps some, my serpentine belt squeaks (when it rains), my exhaust rattles some and buzzes a little from a leak, I have some body squeaks, I can hear the spare squeaking against the back glass, Sounds like I might have a lifter tick too.

So make sure it's not something really bad and check up with the more experienced guys on here.

Jeeps all have their own character though!

 

I have the same little knock inside the cab, but dont hear in in the engine compartment. Definitely odd.

 

Had same problem. Its either a cylinder misfire or a crappy valve. If its a misfire,a tune up consisting of a new dist cap rotor plugs wires will end it. If its a valve its normal and welcome to the club of 300000 other jeeps with the same great engine and crappy valves. Itll run like that forever

 

Check lower exhaust manifold for a hairline crack.