Hey my jeep broke down tonight, i was cruising and it started bucking like the tranny was shifting but it turned out to be the motor cutting in and out...by 4 miles later it was undrivable and getting worse. I ended up nursing it to a local food joint and parking it til I could get it home with the trailer.

I had been throwing a CEL for a bad crank position sensor but this is not related to that. it will start and if i hold it at 2-3k it will run but let it drop down, or put it in gear and it will stall and not run.

a buddy suggested fuel pump but i can hear it running...doesnt mean its pumping fuel tho. i gotta check FP in it.

any other ideas, i know some of you have jeeps with 4.0 motors

 

I've seen this twice before....Once it was the crank sensor and the other was a bad battery...

Rick

 

looks like im putting a crank sensor in it then...i didnt think it would be it tho cause it will start and run at certain rpms but just wont stay running.

and the battery is only 8 months old, and its good.

i hear the CPS on a 4.0 is a pain

 

this is what im afraid of when i tear my dodge apart. i wouldnt mind being without a vehicle and only work a mile from my house, but not 110

 

well i replaced the CPS and it runs now, but still keeps throwing the CEL with the same 1391 code

 

How did you clear the Code RollinCoal? With the right scan tool or just unhookin the battery. My POS Jeep I had never liked anything but the DRBII to clear codes....

Rick

 

a scantool, one of the cheap $50 scanners. it turned it off, but first drive it came right back on.

 

Here is what i found. Google is your friend!
http://www.jeepforum.com/forum/showthread.php?t=531193

 

that doesnt tell me a thing, i already changed the CPS and the code is still there but at least it runs now.

 

did you disconnect the battery when you did it?

 

no i didn't. i didnt think i would have to since i had the scanner to cler the code.

 

just throwing it out there...

 

well its not fixed at...it wont idle now, i can start it rev it and dump it in gear and take off but when slowing to turn or stop it stalls and i ha e to repeat the process. its still givng me the p1391 code.

do these motors have a cam pos. sensor in the distributor...i read that on another site but dont know anything about that.

 

Might want to call Glenn and ask him at lunch. 12pm is when he goes to lunch.

 

The offer still stands, just give me a call.