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  #1  
Old August 9th, 2018, 19:59
deproson deproson is offline
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Loss of cam or crank sensors

So to start I have a 2001 Xj 4.0 auto 4WD.

I have been chasing multiple issues for months now and still I am not any closer to solving the issue.

I have a loss of cam or crank sensor code along with ignition coil circuit A B C performance.

My xj will run for about 30 seconds and then stall. When I say it runs I mean it runs at an idle fand fluctuates from about 300 rpm to about 850 rpm and dies after about 30 seconds. I have replaced the cam and crank sensor with Oem parts. That did not resolve the issue. I replaced the coil assembley, that did not fix it. I have continuity tested the whole engine harness and have found no issues with it.

I found a good deal for a engine harness and a known good ecm and I bought those and swapped them out and still no change.

I have also changed the timing chain set due to the higher mileage of my xj (260,000) miles.

I am a diesel mechanic by trade I know that the timing set was done correctly.

I know that the cam and crank are in sync. (Verified with snap on Zeus)

I did however make an observation while I had it connected to the snap on scanner, it would show while KOEO a status window that would say sync ok then switch to not in sync. Im not that familiar with Jeeps and how they do things but to me that does not seem correct.

Im running out of ideas and where to look. I feel like Im chasing my tail. Any help with this would be greatly appriciated. I love my Jeep but after almost nine months of chasing this issue Im about to give up and find a different Jeep.
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Old August 9th, 2018, 23:37
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sidewaysstarion sidewaysstarion is offline
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Re: Loss of cam or crank sensors

Can your snap-on scanner see the crank and cam counters? Also have you tried a new coil rail?

Also you think I'm crazy, but try starting it without the accessory belt and see if it will run.
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Old August 10th, 2018, 06:26
deproson deproson is offline
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Re: Loss of cam or crank sensors

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Originally Posted by sidewaysstarion View Post
Can your snap-on scanner see the crank and cam counters? Also have you tried a new coil rail?

Also you think I'm crazy, but try starting it without the accessory belt and see if it will run.
Yeah it sees the counts. They appear to be what they should be. Crank goes to 160 and the cam hits 80 then the count starts over.

Ill have to try the belt when I get a new crank sensor from the dealer. The dealer warrantied out the other oem crank sensor that I bought nine months ago. Considering that the Jeep never ran right since I swapped the oem sensors in I have a weird feeling that maybe I got a bad sensor out of the box straight from Jeep.
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Old August 10th, 2018, 06:30
deproson deproson is offline
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Re: Loss of cam or crank sensors

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Originally Posted by sidewaysstarion View Post
Can your snap-on scanner see the crank and cam counters? Also have you tried a new coil rail?

Also you think I'm crazy, but try starting it without the accessory belt and see if it will run.
Yes I have a brand new coil rail on it. Also oem.
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