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check the wiring along firewall(not the big one), it has wires for CPS & Cam sensor, and goes to computer. Check for contiuity from one end to other. I replaced cam & crank sensor & truck still runs sometimes and wont start others. Jeep checked sensors & they were good & they werent sure...

Do you have engine light on? You might have codes that will help find problem. goodluck

I Need it. Well Jeep looked at for 2 hrs and have no idea what it could be. They told me they can cont. to look at but it will get very expensive($98hr). I picked it up and i'm going to check wiring, Jeep said the sensors(Cam & Crank) are good and the timing was good. Start there first.

Thanks Timber, I brought XJ to Jeep, I gave them all I did on paper. Hopefully they find it.

Thanks for info, The fuel pump is still running, it seems to be pumping fuel like its running, strong smell of gas. Wont start. I couldnt locate another coil pickup(CPS), i think my new one is bad.

OK, CMP(coil pick up) came up bad, I replaced and now the truck wont start, kicks over sometimes but wont start.

This info is great, thank you very much. I just went out & purchased 2nd CPS($106) to ind out thats not the problem. W/this info i can do more testing and less spending. thank you

Thank you, thats what I was thinking but wasnt sure. The XJ runs good sometimes, the loses all power till i turn off & restart.

Trouble code P1391 - Loss of CMK or CKP ?? Does anybody know what this is?:tears: The truck will run fine until you rev engine up to 2000rpm the engine will drop to 200rpm and giving it throttle wont do anything.

thanks for the help. I finaly got it running by setting marks on gears together for cyl. 6, 1 rotation & set distributar to cyl 1. truck ran somewhat, replaced CPS and it ran great, till i took it for ride. XJ will run for awhile then engine will die to 200rpm, shut off & restart no problem...

thanks for the info it was very helpfull... Now the engine barely startshasta But the timing sounds good, looking to change CPS. Any other Ideas? THANKS

Thanks for the info. I spoke w.tech. from jeep and he said to line up the marks on gears for cylinder 6, then rotate crank 1 time and set distributor to cylinder 1:wow:

Timing chain jumped teeth on my 99' XJ w/4.0 at 193k miles. Purchased new timing set but cant get it runnung again. Followed the CLYMER book and seems to be out 180 degrees. :huh: suggestions please thanks

Nice work, How much wider is it compared to stock?

I use Amsoil & love it, except limited places to purchase. You can almost go 25k miles before oil change or 1 year. My 99 cherokee w/190k runs a lot quieter and smoother, got 2 mpg better after changing all axles, trans, transfer case and motor. Can use any oil if you dont order the oil in...

Do you have original radiator?, how long ago did you change it? Did you do a flush, rust will build up in motor & radiator & restrict flow. Does your radiator hose collapse when engine is running hot? some companies dont put "spring" in hose to stop from collapsing. Does it over heat...

The best way to know what tire pressure to use is to put chalk across tread of tire(3-4 areas) on each tire. Drive a short distance & see where its worn on each tire. The Chalk should be worn same from inside of tire to outside of tire. If its worn in center only you have to much air & the...

When was the last time you did tune up? What year do you have? A clogged cat will usually glow red after you drive for 10-15 minutes.

I think the look good, but how do the work? Do they shine on the hood and fenders?

welcome aboard, all info you ever needed and then some. there is a lot of info to search.