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Discussion Starter #1
I was driving to work last week and the engine suddenly stopped on my 2005 Jeep Wrangler TJ while I was driving. I started the car, went only a 1/4 mile down the road and it stopped. I managed to steer over to the side of the road and restarted the engine. It started right away and then about a mile down the road it sounded hesitant once more quickly but the engine did not stop this time and I continued driving to work and made it there with no other issues (about a 10 minute drive). I did not see a check engine light come on or any other indication that anything was wrong.

Decided to change the spark plugs and put in fuel injector cleaner in the gas tank. This car does not get driven every day of the week and only has 11,000 miles on it.

Drove the car during the last week in the afternoon and evening with no problems.

Then started the car this morning, driving to work and got about 2 miles down the road, came to a complete stop at a stop light and about 20 seconds later, engine suddenly died exactly as it did last week. I had enough time to park the car, restart and it started OK, thankfully. I made it to work without any other problems.

The only things that are common about the two incidents was that it was earlier in the morning and cooler temps outside - I'd say around 45-50 degrees out. That's really the only differences I can think of from the other times that I drove it without any problems.

Any suggestions as to what's going on or how to fix it would be very much appreciated. Thanks so much in advance.
 

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Hard to say with the given info, filling in your profile would help. I'll take a shot in the dark, and say check your fuel pump. Good luck.

P.S. Calling your Jeep a car will catch you some heat on these forums, Welcome!!!
 

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That sounds like the CPS (crankshaft position sensor) may be getting flakey. The CPS generates the engine's master electronic timing signal by generating pulses from notches cut into the flywheel. The CPS is mounted where the transmission bolts to the engine, up high on the driver's side.

The "other" CPS is the camshaft position sensor which can cause the exact same symptom but it is better protected by its location inside a housing atop the shaft that used to hold the distributor on the passenger side of the engine so it's the less likely sensor of the two to go bad.

No guarantees but the crankshaft position sensor can go bad (it's pretty common) and when it does, it causes your exact symptom. Good luck with it, I hope the bad part is something cheap and easy to replace like either of those two sensors. :)
 

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Did you check your battery connections?! Start simple and then work forward. Loose connections could account for the intermittant stalling.

Good luck!!
 

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Discussion Starter #6
Thanks for the replies. I cleaned the throttle body and removed and cleaned the air control sensor. I thought that was it and it seemed to be OK until today when I started the Jeep at 3:15 PM this afternoon. It started up and stopped on me while it was still in park. It did the same thing where it hiccuped about 30 seconds after starting then kept going until about 20 seconds later and the engine stopped. No check engine light or anything came on.

Planning on changing the fuel filter and replacing the two CPS sensors mentioned to try to get this to stop once and for all. Any other ideas? Thanks again.
 

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Don't bother replacing the fuel filter, that is NOT the problem. The TJ's fuel filter's surface area is positively huge and does not clog, it is considered by the factory as a lifetime filter. Plus you'd have to drop the fuel tank to even get to the fuel filter.

The first sensor I would try replacing is the crankshaft position sensor as it is the one that most commonly causes this problem.
 

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Part of the problem maybe that your jeep dosent like being called a car.:(

Seriously, I had a car and it was a car, but it had a dirty fuel filter and it acted somewhat like your jeep. You could start it up and it ran fine until you drove about a mile and it would quit, let it rest for about 5 minutes and it would start and run for another mile or two and quit. What was happening was that the dirt caught in the filter would settle down to the bottom of the filter and all was good, but when you drove the car which required more gas going through the filter, the particles would clog up around the filter line out and choke off the fuel to the engine. I'm not sure if jeeps have the type of filter that would do this but it's something to consider. :)

Good luck fixing the problem!
 

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Just throwing it out there...


Anyone? Could it be related to the SKIM module, if there is one on the vehicle?
 

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SKIM faults allow it to start, run for a second or two at the most, then it shuts off like you turned the ignition off.
 

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Discussion Starter #12
Don't bother replacing the fuel filter, that is NOT the problem. The TJ's fuel filter's surface area is positively huge and does not clog, it is considered by the factory as a lifetime filter. Plus you'd have to drop the fuel tank to even get to the fuel filter.
I found this out this afternoon...so not touching the fuel filter. Thanks for the information. Going to replace the crankshaft position sensor. What about the IAC sensor? I tried to clean it, but could that still be causing the problem and needs to be replaced?
 

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I found this out this afternoon...so not touching the fuel filter. Thanks for the information. Going to replace the crankshaft position sensor. What about the IAC sensor? I tried to clean it, but could that still be causing the problem and needs to be replaced?
I'm speaking on relative terms because I've owned a Jeep for about an hour now...LOL

On my Dakota, the IAC would not cause those types of symptoms...the IAC is an IDLE air controller. Symptoms of a bad IAC would be...starting and immediately dying (refusing to idle), or when switching between gears (Park to Drive, Drive to Reverse, etc where it idles down before switching), it may nearly stall or stall out. Never displayed any kind of problems while driving down the road however. I would assume it would be the same on a Jeep.

There are 3 things that are crucial for an engine to run...fuel, fire, and air. So those are the things you wanna check.

Air is simple really...is your air filter dirty? Is your exhaust pinched/clogged up? That's not likely your problem. Just explaining what you'd check.

Fire...I'm not sure how these Jeeps are setup so I can't comment much on that. Coil packs or distributor? One of the components in the system may be going bad...such as an ignition coil or something along those lines causing it to stop firing and die.

Fuel...can be a lot of things...most commonly fuel pump or injectors.

Of course then with newer vehicles we also have to consider the likelihood of sensors going bad...which is often the main source of problems.

CPS sensor would fall in this section and could possibly be it...on the Dakotas, it typically threw a CEL when it started going bad, but who knows on a Jeep?
 

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I had this problem on a Bronco..... maybe a fuel relay is faulty? I'm not an expert so take my advice with a grain of salt.
 

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I doubt it would be a bad PCV valve...I think the way you test those is pop em out and shake em. If they rattle, they're still good.

If you wanna change it just to be certain, they're only a few bucks.
 

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Mariah, don't know if you got your jeep going or not, I hope so. A little piece of advice, which you may have already picked up, listen to Jerry Bransford. He knows what he's talking about. What does a problem with a car somebody used to have, have to do with the Jeep you now have?
 

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One more question to ask. Could it be a bad PCV valve? I'm just trying to cover everything. Thanks.
Our TJs don't have a PCV valve. They have a positive crankcase ventilation hose leading out of the valve cover but there is no PCV valve like is on older cars. :)
 
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