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Topic Review (Newest First)
09-26-2012 02:59 PM
arizonaTJ
Quote:
Originally Posted by lightningdan View Post
I just did the crank position sensor in my girls jeep, the wiring harness for it touched the exhaust manifold melting it...
Quote:
Originally Posted by Junior815 View Post
Maybe someone could help me out. I have a 1997 wrangler 2.5 5spd. The other day I left class and got about 3 miles before the jeep died on me while going about 50 mph. Kind of started trying to die and sputtered out. I was unable to get it started. I had it towed home the next day. Meanwhile I immediately looked on the forum for more info. The jeep would not start at all when I was checking it out in the garage, I first checked the relay in the engine bay and found that it was good by swapping with the horn relay. I then checked the fuses and found a blown 20 amp fuse which I believe to be the fuel pump fuse. "My initial thought when this happened was fuel pump anyway". I put a new 20 amp fuse in and tried to start it, the jeep will try to start but will not run for more than a second or two at a time when it even starts at all. I do smell gas now and can hear fuel pump running when key is turned on. My jeep has always had the slow start issue that is detailed in many of these threads. I am sure the FPR needs to be replaced but haven't worried about it because it always eventually started. So now I am thinking crank shaft position sensor. Not only because of the threads I am seeing but because I had to replace clutch 3 weeks ago which involved pulling trans and wiring underneath. So maybe a plug cam loose or I am losing connection somewhere? Maybe the CPS went bad? What do you guys think? Any help would be greatly appreciated. Thanks!
I finally got my CPS yesterday and installed it today, it turned out that like LightningDan's mine was touching the exhaust manifold and melting the insulating rubber around the wiring, and then I just had a clump of exposed wiring, which I would assume is why the sensor "went bad". If you think it is the crankshaft position sensor go take a look at it, follow the wiring very close to see if there is any exposed wiring along the connection, and then check the sensor itself to make sure the bolts are completely tight, look at the pictures I attached to help you find what your looking for if you're lost. I took my jeep on a test drive and seems to be doing fine, I'll make sure to update as I drive it more.




My sensor was tucked behind the air box that goes into the engine, hard to see in the first picture


I had to crawl under my jeep to get to the cps, but it wasn't too hard to spot once I was down there.
09-22-2012 08:44 AM
Junior815
Need some assistance with similar issue.

Maybe someone could help me out. I have a 1997 wrangler 2.5 5spd. The other day I left class and got about 3 miles before the jeep died on me while going about 50 mph. Kind of started trying to die and sputtered out. I was unable to get it started. I had it towed home the next day. Meanwhile I immediately looked on the forum for more info. The jeep would not start at all when I was checking it out in the garage, I first checked the relay in the engine bay and found that it was good by swapping with the horn relay. I then checked the fuses and found a blown 20 amp fuse which I believe to be the fuel pump fuse. "My initial thought when this happened was fuel pump anyway". I put a new 20 amp fuse in and tried to start it, the jeep will try to start but will not run for more than a second or two at a time when it even starts at all. I do smell gas now and can hear fuel pump running when key is turned on. My jeep has always had the slow start issue that is detailed in many of these threads. I am sure the FPR needs to be replaced but haven't worried about it because it always eventually started. So now I am thinking crank shaft position sensor. Not only because of the threads I am seeing but because I had to replace clutch 3 weeks ago which involved pulling trans and wiring underneath. So maybe a plug cam loose or I am losing connection somewhere? Maybe the CPS went bad? What do you guys think? Any help would be greatly appreciated. Thanks!
09-19-2012 09:10 AM
lightningdan I just did the crank position sensor in my girls jeep, the wiring harness for it touched the exhaust manifold melting it...
09-18-2012 01:59 PM
arizonaTJ Alright, I just order a new cps, I'll keep everybody posted on how it goes once it gets here and I get around to installing it!
09-18-2012 03:21 AM
General Confusion Sounds like a Crank position sensor.
09-18-2012 03:03 AM
arizonaTJ Anybody else have any ideas before I just start replacing stuff? Does that error code mean PCM or could that still be crank shaft sensor?
09-15-2012 09:45 PM
rusty1 It could be the crank position sensor. Had same issue with mine, the shop that did some work on it forgot to bolt mine back in place, same symptoms. Yours could be going bad.
09-15-2012 04:48 PM
arizonaTJ
Quote:
Originally Posted by ciamex

you know the turn the key on three times trick right? and it spits out all your most recent codes?
I completely forgot about that! I went and did it and got only code 12 back, which after looking it up I learned means "Direct battery input to PCM was disconnected within the last 50 Key-on cycles."

So this means my PCM is going bad and needs to be replaced?
09-15-2012 09:33 AM
ciamex
Quote:
Originally Posted by arizonaTJ View Post
I tried but the check engine light only stays on for a second and scans fine the rest of the time.
you know the turn the key on three times trick right? and it spits out all your most recent codes?
09-15-2012 09:18 AM
ciamex Computer

especially because you get no codes... now before you run out and buy a computer weight the pro's and con's

I would start with your sensors at your throttle body.... that's about $180 bucks....

computer $180- $ 270

if you have a buddy that's willing to borrow a computer then you could test it that way... I have a 4.0

but check out this write up that this guy did on his computer he had a failure to start problem too.. like you described... but they hear clicking only noise ... read up on this see if any of this helps...

http://www.jeepforum.com/forum/f12/c...rs-ecu-492597/

Also an AIC will cause all kinds of a hate and discontent.. remove it with a torx screw driver and make sure its squeaky clean inside there.... carbon build up will cause the plunger to not seat or even move which could create hovac..
09-15-2012 08:02 AM
arizonaTJ I tried but the check engine light only stays on for a second and scans fine the rest of the time.
09-15-2012 05:02 AM
robbiecc have you gotten any error codes??
09-15-2012 03:07 AM
arizonaTJ
Gauges off, yes crank, no start and several stalls, help!

Alright, so I am having some problems with my 1997 Jeep Wrangler 2.5l. There are a few incidents recently (past two days) that I would assume are related.

Incident 1:
I was at a stop light not particularly paying attention, and when the light turned green I put my Jeep in first gear and eased on the gas and noticed my engine had died. Thinking I had stalled it, I tried starting it but it just cranked (sounded fine) but wouldn't start. I pushed it into a near by parking lot and was taking a closer look at everything and couldn't find anything wrong under the hood. I then got back in and noticed that all my gauges were all the way down, but the fuel gauge, battery gauge, and oil gauge would usually have some value with the position the key was at. I took the key out and went back to my visual inspection. Still not finding anything wrong I started pushing towards my Apartment (it was about a block away) and I pushed it about 5 feet and then stopped to put the key in the ignition and all my gauges turned right on and I was able to start it fine and it immediately died. I started it a second time and drove home with no further issues.

Incident 2:
The next day I took the jeep on a test drive for a while to see if the incident would show its head again so I would know if I could drive to work or not. The Jeep fired up fine and drove like nothing was wrong, so I headed off to work. After about a 15 mi drive on the freeway, I got off at my exit and came to a nearly complete stop and then put it in first and tried to accelerate, but I felt the engine slowly (about 4 seconds) fade out and die. The gauges turned off and it cranked but wouldn't start. I turned the key from all the way off to all the way on 3 times and the gauges turned back on and I was able to get to work.

Incident 3:
After work I was stopping at the store and I when I turned on my turn signal and started to brake (still in gear) the engine died, power steering, brakes, and radio and gauges went out, as well as the check engine light coming on. I pulled in to the parking lot and stopped in the first spot. The jeep fired right back up and I drove to the front of the parking lot and parked it.

Incident 4:
After the store, I was driving home on the free way (about 65mph in 4th gear) and I felt the engine start to die, I'm not quite sure how to describe the feeling of the car besides it was a complete loss of engine power and gauges all dropped to 0, but then after about 3 second everything turned back on and I had no problems the rest of my drive (i slowed down to 55 and put in 5th).

Any ideas on what my problem is? Reading around I've found related problems with the fuel, fuel pump, crank shaft sensor as the culprit, but does any body have any similar experiences that they found a solution for? All of the incidents happened after driving on the freeway, which for my little 2.5L is quite a task, could this be part of the problem? I know the 2.5L TJs have a tendency to throw a rod, is this an early sign of this? Please let me know, anything helps!

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