I've got a noise I've been trying to figure out, I took the Jeep to a mechanic and he told me he thought it may be a piston pin causing it. What's strange is that it's somewhat random and seems to go away once I drive for 10 to 15 minutes. It does not seem to matter if the engine is cold or warm. I've checked the flex plate bolts (I've had a cracked flex plate before and the sound it different from what I can remember), ran aerosol Seafoam through the intake and also switched to Rotella oil with no changes. In the video you can see how the noise it louder under the motor and it also the pitch of the sound changes and goes away. Any ideas?
2004 TJ with 4.0 and 42rle trans
http://youtube.com/watch?v=N6tPHeGGID0
2004 TJ with 4.0 and 42rle trans
http://youtube.com/watch?v=N6tPHeGGID0