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Unread 09-13-2013, 05:22 AM   #1
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Join Date: Sep 2009
Location: PA
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Bucking, Dying and Not Starting

Howdy all. I have a bit of a quandary here on my 2000 XJ, 170Kmiles.

Yesterday as I was slowly driving through a parking lot the jeep just died. (Reminded me of a crank position sensor that went bad on me years ago, no warning, just nothing.) The jeep did start right back up though. An hour later I'm doing 70mph down the highway and the jeep begins to buck (almost felt mechanical). Slowing down eliminated the bucking. When I say "bucking"I mean bucking! I thought the jeep was going to tear apart. Also, the bucking at those speeds is intermittent. Everything's great for 5 minutes then wham! Now this morning the jeep wouldn't start, initially. The engine turned over strongly. On about the fifth attempt to start it she roared to life. That's it, thoughts? I appreciate any information you may be able to lend.

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Unread 09-13-2013, 05:33 AM   #2
It's the crank sensor!
tjwalker's Avatar
1999 XJ Cherokee 
Join Date: Nov 2007
Location: Central Minnesota, MN
Posts: 8,434
Have you seen a check engine light? If so, gotta pull the codes for clues/guidance.

If you don't have a CEL, I'd start by first ensuring you have fresh spark plugs (I like NGK copper plugs gapped to .035 for your vintage) and testing your fuel pressure.

For your 00, you should have 49 psi at idle. If you don't have access to a fuel pressure gauge, they can be rented from many parts stores; call around.
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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Unread 09-13-2013, 05:43 AM   #3
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Thanks for the reply. I should have mentioned, no CEL. I wish it was that easy. I'll call around for a pressure tester. Did I mention that I have a 130 mile trip back home today?....I just hope I can limp it along.
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Unread 09-13-2013, 11:39 AM   #4
Real Jeeps have dents.
CJ7-Tim's Avatar
2000 XJ Cherokee 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 21,655
Based on the limited info, I would guess CPS, O2 sensors, or TPS as the cause. They all can be easily tested for proper functioning.

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Unread 09-13-2013, 12:47 PM   #5
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I think it's the CPS! The night before these things started happening my fuel gauge was reading much lower than actual then it went back to normal the next day. If this is a symptom of a bad CPS, as noted in another thread, and it died like it did the last time the CPS went bad I can't believe they're not correlated.
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