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Unread 04-09-2007, 06:41 PM   #1
AL1951
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Engine stalling

I have a 2000 TJ 4.0/auto. It has recently starting stalling for no apparent reason. This happens regardless of temp, rpm, idling or moving (any speed). I have replaced the throttle positioning sensor and the MAP sensor. I have had a scanner on it several times, no codes. I have also checked the fuel pressure when "on" and when running. 43 and 48 respectivly. I checked the pressure after it stalled and got the same results. I am running out of ideas of where to check next.
Thoughts anyone?

Thanks

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Unread 04-09-2007, 07:54 PM   #2
87warrior
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If I understand your post correctly, you state that the engine stalls randomly... While moving, stopped, accelerating, decelerating, etc.

Does it sputter at all? Always fire back up? Any hesitation? Any recent engine/eletrical mods. Did you use a new gas station? Does it feel any differant prior to the issue? Any recent wheeling? Do the gages do anything before/durring/after the stall? Have you reset the computer (who knows?)

Engines need 3 things to run: Fuel, Air, Spark.... We just need to figure out which one keeps disapearing (probably fuel or spark )
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Unread 04-09-2007, 08:00 PM   #3
bobbert350
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Quote:
Originally Posted by 87warrior
If I understand your post correctly, you state that the engine stalls randomly... While moving, stopped, accelerating, decelerating, etc.

Does it sputter at all? Always fire back up? Any hesitation? Any recent engine/eletrical mods. Did you use a new gas station? Does it feel any differant prior to the issue? Any recent wheeling? Do the gages do anything before/durring/after the stall? Have you reset the computer (who knows?)

Engines need 3 things to run: Fuel, Air, Spark.... We just need to figure out which one keeps disapearing (probably fuel or spark )

yea that would defently help alot if you give a little more info.. also one more question does it stall when its wet or damp outside just another question?
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Unread 04-10-2007, 06:42 PM   #4
AL1951
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It doesn't make any difference at what RPM or work load it is running, dry,damp,hot or cold. It just cuts out. There has been no work done recently. It doesn't give any noticable signs before stalling. Lights and gages stay on after stalling. No alert lights.
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Unread 04-11-2007, 04:57 AM   #5
AL1951
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It doesn't make any difference at what RPM or work load it is running, dry,damp,hot or cold. It just cuts out. There has been no work done recently. It doesn't give any noticable signs before stalling. Lights and gages stay on after stalling. No alert lights.
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Unread 04-12-2007, 01:10 PM   #6
JEEP97TJ
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I Just started having the same exact damn problem with mine!!, two weeks ago when it started. what a PITA. Check out my thread: http://www.jeepforum.com/forum/f9/jeep-wont-start-400306/
compare symptoms, seems EXACTLY the same. All the lights and stuff stays on.....stalls out of nowhere....mines a 97, 4.0L auto also!! Took it to shop last thursday, ran a diagnostic test, no codes came up. Driving my Jeep like this really bit me in the *** last night. I haven't had any alert lights either!!! Ive been looking into the fuel pump/sending unit, but I havent been able to pinpoint the problem.
Read over my thread, please let me know if you figure anything out.........its been the same exact problem.
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Unread 04-12-2007, 01:13 PM   #7
Jerry Bransford
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Sure sounds like the Crankshaft Position Sensor is failing! Mounted next to the flywheel on the driver's side, the CPS provides the engine's master timing signal and without it, the engine will die.
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Unread 04-12-2007, 01:20 PM   #8
JEEP97TJ
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Quote:
Originally Posted by Jerry Bransford
Sure sounds like the Crankshaft Position Sensor is failing! Mounted next to the flywheel on the driver's side, the CPS provides the engine's master timing signal and without it, the engine will die.

Thats a new suggestion----any other info/symptoms on that??
Replacement Part??
anything??
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Unread 04-12-2007, 01:38 PM   #9
alvinl
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I just had the crank position sensor replaced on my '98 TJ. It's kind of pricey, but fixed my problem. Sounds like your problems are similar to what I was experiencing. Here is the thread I created about my problem.

http://www.jeepforum.com/forum/f9/sudden-loss-power-392618/
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Unread 04-12-2007, 01:51 PM   #10
JEEP97TJ
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That is interesting. What I find weird is that with such a similar problem--engine cutting out---I have read about 'solutions' which include : TPS sensor, O2 sensor, Fuel pump/sending unit, fuel lines, and now CPS. Gonna drop it off at the dealership tonight, see if they find anything---they better. I just want to be able to drive my Jeep again.
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Unread 04-12-2007, 02:46 PM   #11
Jerry Bransford
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I would just buy the CPS at the dealer and install it myself. It's only held onto the flywheel housing with a single bolt (two bolts on the 5-speed tranny version) and it just plugs in. The dealer will charge you an arm and a leg for diagnostics, the part, and the labor.

That your engine suddenly dies without warning is the symptom that lead me to the CPS. Those other items you mention would not generally cause intermittant complete engine stoppages.
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Unread 04-12-2007, 05:00 PM   #12
JEEP97TJ
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I Searched Advanced Autoparts, they had quite a few to choose from, the second link has what I guess I would be looking for with the Automatic Trans. It isnt nearly as expensive as a fuel pump/sending unit assembly & installation. But, since the check engine light came on and stayed on when the engine would shut off and ignition still on, I think the dealership might be able to bring up a code. If theres no code, I will definitely think about ordering a new CPS, it'd be great if they would just find a code and repair it.

http://www.partsamerica.com/ProductL...osition+Sensor

http://www.partsamerica.com/productd...pe=762&PTSet=A

Mr Bransford, you do not believe that a faulty fuel pump/sending unit would cause the engine to stall out without warning? How about especially (as of yesterday) during hard turns (especially left hand turns)?? I am not sure if theres a correlation, but I remember reading another thread about the engine cutting off on turns
I appreciate your suggestions
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Unread 04-12-2007, 05:05 PM   #13
Jerry Bransford
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The CPS has a bigger history of failing than the fuel pump does... which is not to say the fuel pump could not be failing. I can say this... replacing the CPS is sure a lot easier and less costly than replacing the fuel pump assembly.
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Unread 04-12-2007, 05:09 PM   #14
JEEP97TJ
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Agreed. Just searching out my options. Taking the Jeep (or attempting, since its at the shop which was conveniently at the bottom of the hill which my jeep cut out on last night) to the local dealership. They will waive the cost for a diag test if they find something wrong, so we will see. Next step is ordering a CPS then, not expensive, and i guess simple to install---do you have to remove anything to get access to the bolt, or just pop the hood up, unplug, unbolt, and put it in?
Thank you.
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Unread 04-12-2007, 05:13 PM   #15
Jerry Bransford
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The only thing semi-difficult about replacing the CPS is getting your arm and socket wrench up to where it is. It's HIGH up on the driver's side of the bell housing, and you get at it from the bottom. It's definitely doable though.
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