2004 4.0 2WD Intermittent/Irregular Ticking Sound at Idle

[sfhess]

My 2004 4.0 with 206,000 miles has an intermittent, irregular ticking sound at idle. Sounds like tapping on the exhaust pipe. Not tick-tick-tick-tick but tick..tick......tick...tick. Is this related to the timing chains or something else?

 

[Rayan]

I have the same thing, but it only does it when the car is idling in drive. I have no idea what it is!