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Old 03-03-2011, 04:49 PM   #1
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94 wrangler Intermittent starting problem

Guys -this is a good one
I have a 94 wrangler with the straight six. Sometimes it starts, sometimes it doesnt. no rhyme or reason why. When it does start, it starts easily and right away on the first crank. When it doesn't start the engine will just crank and crank. One time when It did not start, I tested and found no spark on the main coil wire. I changed the coil and plugs and she fired right up. I also put in some injector cleaner in the gas. However, a few days later it did not start again and this time the battery went dead.

Pissed off and no time to fix it, I had the jeep towed to a jeep dealer. They replaced the battery but the intermittent starting problem still exists. They have had the jeep for 3 weeks trying to "catch" the problem. Today I called and they said it did not start. They think it is in the starter relay circuit and are looking to get a wiring diagram.

Any thoughts on what the problem could be?

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Old 03-03-2011, 05:25 PM   #2
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Is there anything different about the temperature, or humidity on the days it doesn't work? Were all the connections checked to make sure none were loose? Is it possible the Auto Shutdown relay is flakey and needs to be replaced?

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Old 03-03-2011, 05:57 PM   #3
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the temp has been between 10 and 30F. the problem seems to happen when its colder but it has started at 10 degrees. The wires never been checked (which ones).

What is a Auto shutdown relay?
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Old 03-03-2011, 10:22 PM   #4
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A relay in the engine compartment fuse box which is supposed to get a signal from the PCM to tell it to allow the engine to get a spark. If the relay is sticking it might not let the car start, though you can turn it over.

If PCM was causing it you should get trouble codes in the diagnostic connector which the Jeep place should have attempted to read.
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Old 09-10-2013, 11:59 PM   #5
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Hello, im new to the site and recently purchased a 94 YJ straight six, manual trans and am having the same EXACT issue. Recently replaced the battery. 800CCA, 3 days t later the intermittent starting problem returned. Ive been very conscious of temp. conditions, weather etc. And there is literally no pattern to the starting. Wondering if anything was solved or figured out from the posts above. Any help would be appreciated.
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