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Unread 10-01-2010, 11:11 PM   #1
Sergeant_Zeta
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1991 XJ Cherokee 
 
Join Date: Jun 2010
Location: Canton, Geogia
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She has died.

My 1991 Laredo XJ just died on me tonight. I was cruising home after work going ~40mph when the engine just quit. Pulled over and tried and tried and tried. Nothing. So now she's sitting there all alone in the cold night.
I have had a few stalls before, but never while the RPMs were up in normal running range before. Also, she's always come back to me in the past no problem. So, I was wondering if any of you kind folks would have any ideas before I have to call the wrecker and take her to a mechanic. Absolutely any help would be appreciated.

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Unread 10-02-2010, 12:17 AM   #2
RBxj
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Try unplugging the cps and reconnect. Might take two or three times, they sometimes get loose and corroded after a few years.
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Unread 10-02-2010, 08:20 AM   #3
dukie564
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Your issue is most likely a bad Crankshaft Position Sensor (CPS). It's a very common problem on our vehicles, and causes the engine to just shut off as your describe.

Does it try to start (does it crank?) or is there no activity whatsoever when you turn the key.

If there is nothing happening i would look at a loose battery connection as the culprit.
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 10-02-2010, 08:37 AM   #4
Sergeant_Zeta
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Thank you both so much. It seems it was the connection for the cps. I love you guys.
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Unread 10-02-2010, 08:54 AM   #5
cruiser54
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Here's a hint and you just verified it for yourself. Unplug every sensor in your engine compartment one at a time, flush the connectors with a good contact cleaner and plug them back in. Guards against future problems. 15 minute job and worth it.
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Unread 10-02-2010, 09:03 AM   #6
dukie564
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Quote:
Originally Posted by Sergeant_Zeta View Post
Thank you both so much. It seems it was the connection for the cps. I love you guys.
I love you too...
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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Unread 10-02-2010, 11:17 AM   #7
Sergeant_Zeta
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Well, it appears the battle is not over. Now it starts every time... but the rpms jump around occasionally and she will stall out. Sometimes it will start again on its own, other times I have to put her in neutral and crank her up.
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Unread 10-02-2010, 11:48 AM   #8
1moneypitt
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throttle position sensor most likely culprit for the sporadic rpm's. if you have to put it in neutral to get it to start sometimes, have someone verify your backup lights work. if not i will pretty much guarantee that your neutral safety switch needs to be cleaned and greased.
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Unread 10-02-2010, 12:10 PM   #9
Jackup
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I love you too...
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Unread 10-02-2010, 07:00 PM   #10
cruiser54
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See post #5 before proceeding any further. No joke.
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Unread 10-02-2010, 11:21 PM   #11
Sergeant_Zeta
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Thanks cruiser, i'll do that. Would you suggest some kind of silicon contact stuff as well? I think I've heard of that helping.
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Unread 10-03-2010, 07:08 AM   #12
cruiser54
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Dielectric grease is good to use. It helps guard against future corrosion.
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Unread 10-03-2010, 07:12 AM   #13
cruiser54
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Same stuff you'll want to have around when you service your NSS anyway. When doing the unplugging and cleaning don't forget the two connectors going to the trans. They're between the right rear corner of the engine and the firewall. One big gray one and one big black one. Mine were filthy.
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Unread 10-03-2010, 08:34 PM   #14
rondak46
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possibly a clogged catalytic convertor?
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Unread 10-04-2010, 06:55 AM   #15
dukie564
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fluctuating rpms can also be caused by a vacuum leak to the manifold. Check all your vacuum hoses for leaks or disconnections
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1995 XJ Cherokee Sport
4.5" Homebrew Lift, 4.0L HO I-6, AX-15, NP231, D30(Open)/C8.25(Locked)
33x12.5 Mickey Thompson Baja MTZ Tires, 283,000 mi and runnin' strong
http://www.jeepforum.com/forum/f22/project-danger-cart-xj-1297118/
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