If it's not a super loud tick...it may be completely normal for the engine. I've heard most Jeeps develop a noticeable lifter/valve tick at around 75k miles...mine was no exception. Now if it's a loud tap tap tap...that's not so normal. lol
I actually had a guy come up to me the other day and go, "Is this the 4.0?" I said, "Yeah..." and he goes, "That is the SMOOTHEST running 4.0 I've ever heard!" ... to which I just replied, "You caught it on a good day." haha
If it sounds like it's several lifters making noise, check the oil pressure - and smell the oil - an injector could be leaking and diluting the oil.
The crankshaft position sensor is at the back of the engine on the top of the bellhousing. The cam position sensor is on the side of the block where the distributor used to be - or under the distributor on some.
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