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Old 04-20-2011, 03:44 PM   #1
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Jeep Won't Start

Well Jeep just died on me the other day. All it does now is crank over and won't start. I put about 6-7 gallons of gas in it just incase i was just stupid and ran out of gas. Now my gas gauge won't move and still just cranks over.

I can here the fuel pump engage when the key is in the ON position. I tried doing the diagnostic test by turning the key On-Off-On-Off-On and nothing displayed on my Odometer like it has in the past. It didn't even show it ran any test.

I'm going to be switching the fuel filter tomorrow. Just wondering what else should I look into? Am I doing the Diagnostic correctly?

I'm also gonna check the spark after I switch the filter.

It's a 1997 Jeep Wrangler TJ

Thanks in advance.

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Old 04-20-2011, 03:52 PM   #2
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Doya have pressure on the fuel rail?

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Old 04-20-2011, 04:02 PM   #3
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this happened to my dads 97 tj a few years ago. turned out to be the coil so id check for spark first instead of wasting money
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Old 04-20-2011, 04:04 PM   #4
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Not sure how to check the fuel rail for pressure. Also just found out that they don't have fuel filters was told that I'd have to just drop the gas tank and clean the fuel pump.

I assumed that it's fuel because I can't smell any unburnt fuel coming from the engine bay.
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Old 04-20-2011, 04:07 PM   #5
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There should be a schrader valve (like a tire has) on the fuel rail somewhere. Take the cap off of it, go in and cycle the key on 4 or 5 times until the pump quits. Then with a screwdriver, push the tit in the valve and see if it shoots, dribbles, or blows gas out of the line. It should have quite a bit of pressure on it if the pump is working correctly.
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Old 04-20-2011, 05:01 PM   #6
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Well I think I have narrowed down the problem. It keeps blowing the F6 fuse. I don't have the owners manual to the jeep anymore so don't know what the fuse goes to.

Anyone know what the F6 fuse from the fuse box under the hood is? It's a 30 AMP fuse and blows everytime I try to start the engine.

When I changed it the gas gauge started working again. Then it blew.
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Old 04-20-2011, 05:23 PM   #7
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http://s743.photobucket.com/albums/x...ent=Fuses2.jpg


#6 Fuse is the Auto Shutdown Relay what could be causing this to blow when the car is turned over?
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Old 04-20-2011, 05:37 PM   #8
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Sounds like a dead short to ground when key is turned on. Realize that doesn't really help-'cept to tell you why you won't have spark or be able to run. Can't complete electrical circuit with a fuse blowing every time so no spark?
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Old 04-22-2011, 10:21 AM   #9
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Does anyone know where the ground to the Auto shutdown relay would be?
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Old 04-22-2011, 10:25 AM   #10
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...did water get into anything? I always think of that when I hear "all of a sudden"
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Old 04-22-2011, 10:35 AM   #11
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I had this happen to me about three weeks back! Hadn't found anyone else with the same problem! At first I thought it was a short in the wiring somewhere, we checked everywhere. Lots of wire looming came off. Sadly, still didn't find it. Thought we might have found a short within a connector. We sauldered it. No problem, drove down the road three miles and the fuse blew, and now it blows them with out the Jeep even starting up all the way. (previously it would run for about a minute.) Tested the coil everything seemed alright. I'm ordering a new PCM today, as I was told a short in the PCM could blow the fuse, and that's the only lead I have now! It seems to me, that we have the same problem!
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Old 04-22-2011, 10:36 AM   #12
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Dead short to ground means there may be wire that carries a positive signal to the relay that is now touching the frame or body which is your ground. The fuse is there to protect the wiring and circuit from overload and possible fire. If it is a short, they are tough to find.
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Old 04-22-2011, 03:15 PM   #13
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Jeep_VT if that works for you let me know. I don't want to just start throwing parts into a problem.

I've blew about 4 fuses so far. I am gonna start looking at the wiring tomorrow even though I know it's going to be hard. Is there a way to see if it's grounding itself out with a tester or some tool?
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Old 04-22-2011, 06:49 PM   #14
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PCMs typically only provide ground and are solid state (no moving parts) so its unlikely thats the short but report back and let us know.
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Old 04-22-2011, 08:29 PM   #15
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We tried to trace any shorts or grounds, and came up with nothing. My father was working on it for a while with me, he spent everyday for about a week and half tracing wires. We found nothing. We put in another ASD relay, checked the up and downstream O2 sensors, and we still had no luck. We checked the coil, everything was as it should be. The only thing that we have left to check is the PCM. I'm communicating with a mechanic, and he says that it's possible for the PCM to have a short and ground inside the PCM, and then making the fuse blow. (Didn't bring the Jeep into a shop though! Think It can be fixed with out that!) Unfortunately, the PCM is sealed in silicone, and I can't mess with it, so my only option is to replace it! Hopefully, I will get it, and put it in early next week, and I will be happy to let you know of my results!!

We were persuaded by some Cherokee people who had problems similar to mine, were it seamed as the short was always jumping and moving, and never seemed to be in one place. They said the way they fixed their problems, was by replacing the PCM!
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Old 04-26-2011, 05:19 PM   #16
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My PCM came in today. Sadly, it did not fix my problem. Still blowing fuses. (We thought we had it for sure.) Pierce07, have you met with any success with your tests?
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Old 06-02-2011, 03:41 PM   #17
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Fixed!

o2 sensor had melted to the header and was grounding out. Wrapped the wires in some electrical tape and then a thermal housing. Also pulled it back away from the header. Now she's running like a charm.

Easy fix to bad it took me a month because I work to much to get a chance to look at it. Hope this helps anyone else with similar problems
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Old 06-02-2011, 05:58 PM   #18
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Good on you for keeping at it and not giving up.
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Old 01-21-2012, 03:09 PM   #19
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jeep 99

yoo do u know y f6 fuse under hood would blow after a day in half of driving but gas gauge still works












Quote:
Originally Posted by Pierce07 View Post
Well I think I have narrowed down the problem. It keeps blowing the F6 fuse. I don't have the owners manual to the jeep anymore so don't know what the fuse goes to.

Anyone know what the F6 fuse from the fuse box under the hood is? It's a 30 AMP fuse and blows everytime I try to start the engine.

When I changed it the gas gauge started working again. Then it blew.
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Old 01-21-2012, 05:43 PM   #20
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That happened to my 93 YJ. turned out to be a loose wire on the coil.
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Old 01-22-2012, 02:34 AM   #21
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Mine ended up being my o2 sensor was grounding out on my header

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