Paul Hart

i would try to replace the coil its like 70 dollars at napa...i had to replace mine like twice, i replaced fuel pump crank sensor and distriber and new cap and rotor and it was coil. i would get at napa bcz you got year warnty on it. like i shorted mine out and took back and they gave me a brand new one

ontheroad

Isn't the coil just for the initial ignition? Would it have caused the engine to cut-out the way it did?

ontheroad

Just looked up the coils at Autozone. They are only $30 and have a 2 year warranty. Should I just get one?

ontheroad

Paul, did you have the same problem as I did?

slaphandz1996_cherokee

dude it is for a crankshaft positioner listen to the video

ontheroad

I did watch the video. He is changing the CAMshaft position sensor, NOT the CRANKshaft position sensor. They are 2 completely different things. All you have to do is read the title to know it's the wrong video.

slaphandz1996_cherokee

what im saying is to get the scan thing to scan and see whats wrong

fantic238

go to a pull it yourself and pull 3-4 cps... one will work.

ontheroad

So all of a sudden, my Jeep started today. I was testing the coil for a spark and when I turned it over, it started. Strange. Anyway, I drove it over to an auto parts store (the check engine light comes on after a couple of minutes driving it) and I hooked up an OBD 1 to see if any codes came up. Here's what I got:

DTC: 51 Oxygen sensor input indicates sustained lean condition.

I looked up the codes on here and found a post that said this:

51 Oxygen sensor stuck at lean position (this may be tripped by a bad MAP sensor system causing a rich condition. If you get hot rough idle and stalling, especially on deceleration, accompanied by flooded engine and difficulty restarting, that can be a bad MAP sensor causing the O2 sensor to try to compensate. If you get poor cold driveability, stumbling and bucking, and acceptable warm driving with poor gas mileage (a drop of 10 mpg or more), that is usually the O2 sensor.).

The guy at the parts store said I either have a bad MAP sensor, or I need my injectors flushed. What do you guys think?

Willys55

89Laredo

I think that code is a totally different problem.

Willys55

Agreed

ontheroad

Then why did my Jeep start up today? It's getting fuel so it's not the fuel pump, and its getting a spark so it's not the CPS/CKS. WTF? I don't want it to die again. I am at a loss.

89Laredo

Only a few things affect spark:
1: Crank Position sensor (most likely to go out)
2: Coil (second most likely to go out)
3: Cam pos sensor (rarely goes out)
4: Cap/Rotor (button can go bad, etc)

I cant think what would cause it to be intermittent like that though.
You have a 50/50 chance of it happening again, or never happening again.. lol

ontheroad

Perhaps after I changed the fuel filter, air got in the fuel line? And it just took awhile to flush it out? That's my only guess.