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Old 11-26-2008, 12:52 PM   #1
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Jeep dieing intermittently

Wondering if theres any insight to my latest problem.

In the last two days my jeep has done three things that lead me to belive that it is going to leave me stranded soon.

1. Driving down the road I suddenly lost all power for about three seconds then out of nowhere the jeep was responsive again.

2. The jeep will occasionaly buck hard, but I am thinking it could be harder than normal due to my detroit locker in the rear.

3. Today twice no the jeep has randomly died on me while waiting a light. The first time the jeep started right up, and the second time it took a while for me to get her running again.

Any ideas are appreciated. I would hate to throw parts at it because these problems happen randomly. I am thinking camshaft or crankshaft position sensor. I forget if the wranglers have one or both of these sensors.

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Old 11-26-2008, 01:01 PM   #2
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And I forgot to mention there are no codes either.

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Old 11-26-2008, 03:02 PM   #3
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My best bet would be the sensors as you said...Or maybe some bad relays...Maybe your autoshutdown relay is bad or the fuel pump relay...Keep me updated
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Old 11-30-2008, 08:52 AM   #4
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Anyone know the cheapest place to get these sensors? Napa wanted 127$ for the cranksshaft position sensor.
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Old 11-30-2008, 09:04 AM   #5
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you need to make sure you know how that crank sensor works. i'm drawing a blank on jeep. some vehicles only use the crank sensor for start up, to tell the computer where tdc is, and after it runs it only uses the cam sensor. can't remember if jeep is like this or not, i know it will cause no start, but not sure about dying while driving. can anyone verify which it is?

no need to replace parts that aren't likely the prob. if it is using it all the time that is a good place to start.
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Old 11-30-2008, 11:32 AM   #6
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NAPA must have looked up the wrong number for the CPS - the last one I bought was $49. Some go as high as $75, there are several different ones.

Yes, a CPS failure can cause stumbling, burping, stalling, and a no start. It's not used just for starting. Sometimes it'll die while driving, then wait a few minutes (5 to several hours) and it'll restart.

But before throwing parts at it - open the connector on the CPS harness, clean it with a good electrical cleaner, the put it back. SOMETIMES that helps.
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Old 11-30-2008, 01:57 PM   #7
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I just replaced the TPS, cleaned out the CPS connector and reset the computer, so we will see what happens.

I called Pepboys and Napa for the CPS and Pepboys was cheaper for 100$ both were for a manual trans. I believe the last CPS I replaced was on a cherokee and the dash kept saying "no bus" and the guages didn't work that CPS was 75$ I believe. I have just never ran into this bucking and losing power randomly.
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Old 11-30-2008, 08:46 PM   #8
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The "no buss" you speak of is a loose connection on the back of the dash assembly. The connectors wiggle loose over time and that is the warning you get.

The CPS sounds about right... might also want to clean the MAP sensor. I had that issue with my XJ's 4.0. The MAP was going out/clogged on it and it would stutter or stall or even flood itself at rest. I sometimes wouldn't be able to get it started until a minute or so of cranking.
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Old 11-30-2008, 08:53 PM   #9
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I would check your alt. Have it tested under load. Battery. Make sure all your grounds r clean and tight. Clean the battery posts and connecters and cover them with vasoline(or like product)....Then see what happens.

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Old 11-30-2008, 10:15 PM   #10
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When I replaced the CPS on the XJ, it cured the "no buss". I believe that the 5 volt referance line was supposedly shorted in the CPS taking out all the sensors.

It could be the alternator but the battery was at about 14 volts while running today. I did clean the posts when I disconnected it today. Didnt check it under load?

Thanks for all the help guys, but today the jeep left me stranded and wouldnt start again. I got it towed to my buddy's shop since I have to go back to work I will keep everyone posted. I will tell him to check the cps, but now that I think of it could a fuel pump go intermitently like that before ultimate failure.
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Old 12-01-2008, 08:23 PM   #11
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So the jeep started right up this morning for my friend. Why do I have the feeling this is gonna be a long week?
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Old 12-01-2008, 09:49 PM   #12
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I've had similar problems this week and a ride home in a tow truck

breaking down under load - AUSJEEPOFFROAD

I have just replaced dizzy cap & rotor,plugs & leads hope this fixes it please post your progress I 'll be following this thread with intrest.
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Old 12-02-2008, 11:54 AM   #13
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I talked to my buddy he is leaning towards fuel pump or crank sensor. He still has to check the pressure and volume of the fuel.

Right now Im driving a focus rental. Its horrible.
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Old 12-04-2008, 06:08 AM   #14
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It is still playing up

prime suspects this week are coil ,crank angle sensor & trottle position sensor

but I'm just guessing
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Old 12-04-2008, 07:04 AM   #15
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Could also be bad gas or a clogged fuel filter.
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Old 12-04-2008, 07:12 AM   #16
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I picked it up from my buddies shop, and it drove fine. Then about a mile from my class last night it died again. I replaced the cap and rotor on the side of the road just for s & g. It started for about thirty seconds enough to get to the parking lot of another shop.

So far I have replaced the cap, rotor, TPS, and Crank postion sensor.

There is a new symptom though, everytime it cuts out the people behind me can smell raw gas. Coil going intermittently?
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Old 12-04-2008, 08:32 AM   #17
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Quote:
Originally Posted by Sb5551 View Post
I picked it up from my buddies shop, and it drove fine. Then about a mile from my class last night it died again. I replaced the cap and rotor on the side of the road just for s & g. It started for about thirty seconds enough to get to the parking lot of another shop.

So far I have replaced the cap, rotor, TPS, and Crank postion sensor.

There is a new symptom though, everytime it cuts out the people behind me can smell raw gas. Coil going intermittently?
A replacement coil would be cheap insurance. Unburned gas sounds to me like an ignition/electrical issue. Are you handy with a voltmeter? You can check voltage going to the coil.

Any backfiring going on?
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Old 12-04-2008, 11:48 AM   #18
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I have it at another shop so unfortunatly I dont have the the time to check it myself due to work, but yes I am handly with a voltmeter. Would a coil go intermittently like that?
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Old 12-04-2008, 01:08 PM   #19
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I have it at another shop so unfortunatly I dont have the the time to check it myself due to work, but yes I am handly with a voltmeter. Would a coil go intermittently like that?
Sure. Especially some P.O.S. like an Accel Coil. I had one that would work fine at startup but as the engine got warm (the coil was mounted on a pedastal on the motor) it would degrade, misfire and then just shutdown.
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Old 12-04-2008, 02:55 PM   #20
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MOz, I think your on the right track. This new shop called me and said the spark was extremly weak. They checked around and saw the the coil feed wire had been cut and taped again with just plain electrical tape. I've owned the jeep for three years and the problem just started, but man I dont think I woulda ever caught that. Hopefully, this fixes it.
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Old 12-05-2008, 06:58 AM   #21
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So far no problem with the fixed wire we'll see how it goes, but now the starter is sticking. I don't know how much longer I can afford a jeep. Someone knock these thoughts out of my head.
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Old 12-05-2008, 12:30 PM   #22
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The starter sticking is also manageable. I would suggest you buy a replacement solenoid (if you excuse the the pun "for starters")

I would also suggest you drop out the starter and lubicate the shaft and bendix gear while you are at it. Sometimes you get water that freezes...it's getting cold around here now and if you went wheeling last week and got it all muddy and wet, your starter is probably freezing up a little. WD40 works really good to displace the water. Then use some moly grease on the shaft and gear.

Good luck.
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Old 12-05-2008, 01:37 PM   #23
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i had a different yet similar tj electrical problem last time i had it out......out of no where the jeep started runnin glike crap and then when i shut it off it owould not start.....we flasshed the code.....called the autozone in columbus from indiana and they told me that it was 02 sensor 1 bank 1.....come to find out the plug in had come loose and that crappy little sensor kept me from riding.....thank god for autozone
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Old 03-15-2010, 09:50 AM   #24
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when mine did this, it happened slowly so I was able to tell what was up. My stupid serpantine belt was slipping. My voltage would drop to about 11 from 14 when it would slip. Not a big deal I thought... Until the voltage got low enough to not power the fuel injection!

I sprayed some belt dressing on it and she stuck, then popped right back up to 14v. If I go through mud and water it will slip crazy and not want to run. I have a new belt in the back, just need time to change it.

Wanted to share, just might be something to look at. If your getting any squeel or slip on your belt, it can cause a lot of chaos in a jeep.

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