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Old 07-03-2013, 12:03 AM   #1
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Please help.....

Ok, so ill start with i let a good friend of mine borrow my jeep, (he is having major vehicle problems), well this morning i was following him to host job site and we stopped to get gas, (we both got the exact same amout and grade), then we got back on the road. About 10 mins down the road the jeep made a loud pop and choked down, died and would not start back up, it acted like it wanted to and came close a couple of times (it turns over but doesn't crank). So i hooked to it and pulled it on to the job site. At the end of the day we tried to crank ot again and it fired right up and ran like nothing had ever happened, it ran great for about 5 miles, (enough time for it to warm up) and then choked down and died again.

I replaced the fuel filter thinking it may have been bad gas (but then i remembered i got gas also at the same time and my truck ran great all day) and i also tried bypassing the gas tank by running a fuel line to a gas can and it didn't help. At first i thought it may have jumped timing but i gave up on that idea when it cranked fine while cold.

Its getting gas and fire. We worked on this jeep and scratched our heads all day

Please help, im at my wits end.

88 wrangler yj ..... straight six

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Old 07-03-2013, 05:57 AM   #2
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Check the timing as you suspect and see what is up. It may have jumped but the ICMs are also notorious for giving bad performance when hot. After I did the Nutter and removed unessential wiring and ECM, I also relocated my ICM higher on the firewall. I only mounted it with two screws and the shaking that it recieved made the YJ run like crap and also it would shut down for no apparent reason. It would idle ok sitting still until I smacked the ICM with a screwdriver handle and then it would cut out badly for a few seconds. Check the wiring all around to make sure its all good as well. There isnt any way to look at the ICM and see if it is having problems but I think that AutoZone and the like can test them

The ICM is expensive, around $60 if I recall so make sure everything else has been eliminated before you get a new one.

Good luck I hate intermittent problems. Also a tip. Be as specific as you can in the header of your post and you will usually get more response. Quite a few folks just put "Please Help" or "Help!" and people will just roll by it without looking. I looked because you hadnt gotten any response yet.

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Old 07-03-2013, 07:16 PM   #3
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a clogged up cat can keep it from starting.
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Old 07-03-2013, 07:29 PM   #4
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Quote:
Originally Posted by Mr.Mud View Post
a clogged up cat can keep it from starting.
X2

Also have you tried to start it with a little starting fluid? It's a quick test for the ignition system. Although if its the Cat it still won't start.

My cat blew out like that once so it's possible....
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Old 07-03-2013, 07:49 PM   #5
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I am fixing to check the timing, i just made it home to check the forum for new idea :-). It will (kinda) start with starting fluid but i have to keep patting the gas pedal and it is almost like it tries to accelerate when i let off of the gas.

Ill do some more checking and post bk later tonight.

Thank y'all for the new info
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Old 07-07-2013, 05:19 PM   #6
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So it looks like the timing chain has to be replaced i guess ill change the water pump while im in there.
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Old 07-07-2013, 05:54 PM   #7
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Sounds like the issue that I'm having. Starts fine, then a pop, loses power and it does not want to start. After a while it starts back up just fine. I disco'ed the cat and drove around and it run just fine. I am waiting one the new cat to arrive.

If it still happens look for a plugged cat.

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