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I have a 2001 Grand Cherokee and my father has a 2002 GC. Both are the Laredo trim and both have the 4.0 inline 6. Both seem to have the same tapping/ticking issue. We have checked both out and found that the noise is coming from the flywheel/torque converter area. There is no noise at the top of the engine which is where we initially thought the issue was. The noise tends to be louder at start up when the temp is below 40f and quiets as the engine gets warm. I have also noticed other GC’s that have a similar sound so it is apparently a common issue. What is it? Can it be fixed? Is it worth fixing? It is just annoying!
Both vehicles have close to 200,000 miles and have been very well maintained.
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see if this helps.
http://www.ericthecarguy.com/faq/diagnosing-noises-in-your-car
I had a 1998 GC laredo that developed a tapping noise as well. I was able to quickly figure out that it was a lifter, and all i did was add a bottle of oil treatment, the stuff that thickens the oil a bit and it helped tremendously. the lifter noise is common in all 4.0 six cyl, as well as many other jeep motors. Mine developed the issue around 170,000 miles. I realize you stated that it sounded like it was coming from the fly wheel area, just figured i would share my experience with my jeep. Hope it helps, If not Good luck, Hope you find an easy fix!!
If your noise is like the one in the video, beware. That engine blew up a few days after that video was shot.
Good luck and keep us posted on what you find.
Jeep 4.0 inline 6 cylinders are prone to cracking exhaust manifolds. This is a ticking noise that could sound lower depending where the crack is. They had this problem so much that Dorman makes the manifold and sells it at your local parts store. I am not saying this is the problem for sure but try to eliminate this being one of them.
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