Re: Jeep turned off while driving
I am posting this for those who might search at a later time.
Symptoms: Car would suddenly just shut off at low speed and on the highway it would make a sudden lurch like you tapped on the brakes.
I thought that the fuel pump might be going bad so I replaced it and the filter. After thinking about it, I realized that it acted like a sudden electrical failure in the ignition system. There was no sputtering like you would think that a fuel pump might cause. I should have listened to my instincts on that. So anyways, that wasn't the problem. I did lots of searching on the net and found things like bad grounds and ECM/PCM going bad etc. The one that made the most sense to me however was the Crankshaft Position Sensor. The only problem was I never got an engine code, let alone a CE light warning so I was a little concerned. Anyways, I pulled mine out took it to the autoparts store along with my multimeter and I compared the resistance readings between pins A&B on each and B&C on the old one to the same pins on the new one. They were way out of wack so I bought the new one put it in and the problem was FIXED.
A note on replacement: The sensor is located on the top side of the transmission bellhousing where it meets the engine on the driver's side. The connector for it is on the PASSENGER side attached to the block about right under where the dash board starts, looking from the engine compartment towards the cabin.
I found people who took off the transmission cross member and people who went in through a small access hole under the dash from the cabin side. That all seemed like alot of work to me. I looked at mine and decided that from under the car with 30" of extension (I used two 6" and one 18") and an 11mm standard short socket, I could go over the transmission cross member and attack it straight on with NO swivels attached. (they can be such a pain to get on when you cant reach a bolt with your hand as they keep "going limp" while trying to hook them up). I easily removed the single bolt, letting it drop and used a hubcap tire iron to GENTLY pry the sensor up and out of it's hole but I left it hanging right there without moving it.
At this point I moved to the passenger side of the engine compartment and I unhooked the connector. I then took some string and made a slipknot (lasso type) and noosed the string over the neck of the connector. I made sure I had plenty of string waiting there. I then let that be and moved to the driver's side of the engine compartment. I removed the air box, took a coat hanger and easily fed it down to the dangling sensor and hooked into the now empty bolt hole of the sensor. I then fished it up the driver's side. (the string comes with it and allows you to attach your slipknot to the new connecor and reverse the process.) Don't unhook the slip knot from the new one until you have it connected. (cut the sting at that point)
To install the new one, I layed down on top of the engine and I took the new sensor, the little wire guard bracket and the 11mm bolt in my right hand and was able to reach down from the top and get the bolt started. I then moved to underneath the car and used the long extension to tighten the already started bolt.
This whole process took no more than 10 minutes and involved only removing the air intake box so I could lay up there.
A thought that came to me afterwards. My jeep is a 2WD version (rear axle) I don't know if maybe there is something about a 4WD version that wouldn't allow you to attack it with the 30" extensions or not but check that FIRST as it makes the job so easy.
I hope this helps someone.