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Old 07-27-2012, 12:38 AM   #1
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my jeep keeps cutting off

hey guys. im new to WF but not to the wonderful world of jeep. i come begging for help to get my girl road worthy again. heres the symptoms... at first it would cut off while driving every once in awhile but would bust right back off. this was maybe every so often but more recent it it has been happening more often but throw it in neutal and she would bust right back off and on i go. now in the last week it cuts out twice on my 15ml route to work and doesnt fire off immediately anymore. while she hasnt left me on the side of the road YET i have no choice but to test her relyability seeing how its my only mode of transportation. so i did some research and come up with maybe the fuel pump or maybe o2 sensor? it gives a p0300 code when it happens. i also ruled out plugs or coil packs due to no specific cylinder misfire. any ideas before i drop a tank and replace a pump or sensor that isnt broken....any takers?

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Old 07-27-2012, 03:18 AM   #2
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I'm not %100 Percent sure but I think P0300 is default in you crank position sensor and that's super easy to replace. 80 bucks at autozone and you can change it out yourself. Take it to autozone and they can tell you exactly what the code is.

I'm new to Jeeping too, and I had that code or similar on my Jeep when I first got it and it cleared after I replaced said part. Although it didn't fix my problem =\

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Old 07-28-2012, 08:20 PM   #3
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p0300 is random misfire. so the machine said. and it cranks up, just cuts out on me. any more ideas? im hopin when i drop the tank it will have a dirty filter in pump. i checked relay and fuses. good to go.
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Old 07-29-2012, 02:10 PM   #4
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i have a 99 TJ that I'm having troubles with right now. Sputtering really bad. Code says camshaft positioning sensor. Can't get it at the autoparts store and I have to buy it at the dealer. 80 bucks and a easy fix. Once I replace it I'll let you know how it goes.
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Old 07-29-2012, 04:57 PM   #5
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I am replacing the camshaft sensor as well and swapping out my ECM. Should solve all my problems.
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Old 07-29-2012, 07:32 PM   #6
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Smart move!!

I had the exact same problem as you are having . I also changed my ECM and my camshaft position sensor. I also changed my crankshaft sensor but I ended up taking out the aftermarket crankshaft sensor and putting the old original factory one back in. BUT.... I CLEANED IT UP TIL IT WAS SHINING BEFORE I RE-INSTALLED IT.
The crankshaft sensor is by far the most important and influential sensor on your Jeep.

Good Luchk
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Old 07-30-2012, 08:03 AM   #7
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My 2000 did essentially the same thing, cut out and would start right up again -- at least until the time it DIDN'T start again. Wouldn't throw a code, either. Came in on the hook.

Mech. replaced the crankshaft position sensor and it seems (SEEMS -- it's only a week) to be OK.

You might also check the fuel-pump relay; in mine anyway, the relays all are the same, so you could swap the horn relay with the fuel-pump relay. New one is less than $15 in any case. BTW, they're a PITA to get out -- you may need to grab the relay GENTLY with a pair of pliers and GENTLY rock it back=and-forth while lifting.
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Old 07-31-2012, 02:31 AM   #8
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Replaced the camshaft sensor in my
Jeep: still cuts out and dies on me still going to try and replace the ECM. After that I'm all out of ideas.
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Old 08-02-2012, 12:00 AM   #9
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i finally figured out my prob. it was crank position sensor. man hooked up his mechine. read it and it showed crank sensor or cam sensor or ecm. as he looked at it he shut off. perfect i thought to ,yself. now i dont sound like an idiot explaining this. he says hold on and walks to cooler pulls out a cold pepsi and poured it on the crank sensor. we made a must be thirsty joke and it fired right off. he had it. but did also tell me its not just a put in kinda thing. which made since. i work on ac and reefer units all day. sensors are never plug and play. there is calibration. he said u put in and snug then back it out an eigth of an inch or drive it an eigth. sorry cant remember. so sandevil.... maybe it is the crank and its not calibrated properly. just a thought before u dump a load of cash on a ecm. and to all the others i thank u for help. much appreicated. by the way. any of u from sc area. i need a good trail to ride. unfortunatly everyone around here thinks bogging down ur Z71 is offroading around here. more dollars than cents(sence)
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Old 08-14-2012, 05:56 PM   #10
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Hi guys. My 97 just did this to me and i'm thinking it's the Crank sensor. Jeep will crank but not start. also rpm gauge won't do anything when cranking. The Scan gauge is not spitting out any codes.

4.0 I-6 auto.

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