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post #1 of (permalink) Old 06-06-2004, 06:30 PM
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Help with my jeep!

Me and my parents went to visit g parents.
Very hot day.
Then went back home at around 11PM.
Not too hot.
While waiting at the bridge the engine temp and everything else looked fine.
Suddently the engine dies without warning.
I checked if fuel was flowing. Yes.
A spark?. A weak one.
Can the coil be the problem?. It was kinda hot.
Can the control module be it?.
We tryied cooling them with water.
The engine went back on, but only for a few minutes.
Then died again.
What can it be?
The next day..
It died again while heading to the sand dunes.
Then started again when it cooled down a bit.
Went back home and died at my driveway.
I bought a new coil today but it didnt solved the problem.
Its a 1980 Jeep CJ7 304 V8.
can the pickup coil be it?
the control module?
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post #2 of (permalink) Old 06-06-2004, 06:35 PM
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Re: Help with my jeep!

My bet is on the control module. When they fail, they go slowly and the first signs of their impending death is hot failure. Get a new module and that should cure your problem.

Another thing you may want to consider is the TFI upgrade. Do a search and you will find more info than you can imagine.
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post #3 of (permalink) Old 06-06-2004, 07:46 PM
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Re: Help with my jeep!

Yup, pretty sure you need a new ign. module. It's on the left fenderwell under the overflow bottle. It's a common problem and with what you described it sure sounds like it.
Always carry a spare.
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post #4 of (permalink) Old 06-06-2004, 09:17 PM
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Re: Help with my jeep!

What type carb do you have?
How old are all of those hoses? At the fuel pump, tank, fuel filter?

I only ask because because I was about to dig into the ignition every time Jackson's 304 would act up, but it was always sucking air... there was fuel just not much. It would light up but then bog down and die... really hard to start hot but then run fine cold (cold fuel pump was ok).

Replaced every fuel hose on the damn thing to include putting in a different fuel tank, went from a metal 15 gal. to a stupid 22 Ploy that took up 4" of ground clearence and the to a used AMC Ploy with new sending unit and filter. But never did to anything different to the ignition.

Your description of start, won't start sounds a bit like where we were for a bit.

Somewhere in the time frame above we pulled that 304 out and rebuilt it. After that a few bucks for a chunk of hose wasn't going to stop us.

Good Luck


BTW: It could be the ignition.
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post #5 of (permalink) Old 06-06-2004, 10:13 PM
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Re: Help with my jeep!

How far is the fuel flowing? All the way to the carb?
Vapor lock maybe.... I had a problem with the temp of my metal fuel filter getting to high and boiling my gas. I just extended the fuel hose and moved the fuel filter further away from the exhaust manifold. The manifold was working like a "hot plate" and cooking the filter.
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post #6 of (permalink) Old 06-07-2004, 02:03 AM
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Re: Help with my jeep!

I bought the pickup coil and replaced it right away.
I gave my jeep a hard run, enough to get the temp needle a bit over half. I have the engine with headers, 4bbl carb, intake manifold,.... all the goodies. It seems to be working but im still worried about the control module.
post #7 of (permalink) Old 06-07-2004, 08:46 AM
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Re: Help with my jeep!

I can't provide much help for your problem. Forgive me for using your message to get my message posted. I am new to Jeep and new to asking for help online.
I have a 1979 jeep that stops running while going downt the highway about once per week. I can start it by using the ignition switch. The last time i tried to start by releasing the clutch in 3rd gear at about 45mph. It backfired enough to blow out the muffler crimping- so that it now leaks.
Can someone give me some insight to how to post messages and to this issue- electical or carbeuration?
Thanks again
post #8 of (permalink) Old 06-07-2004, 08:53 AM
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Re: Help with my jeep!

This is a thread hijack...

Start back at the begining. Go to the "index" page, in the middle of the page (left to right) towards the top. you will see a button that says "post" use this to start a new thread.

You also need to tell us more about your Jeep. There are several Jeep motors with several carb and FI set ups...can't even begin to diagnose a problem without more info. Filling out your profile will help us with this.

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post #9 of (permalink) Old 06-07-2004, 03:02 PM
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Re: Help with my jeep!

the control module is very inexpensive to replace, and well worth it if you are in doubt. I just bought a new one at napa for about $23. They had it in stock.


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