89 Wrangler YJ 6 Cylinder dies - JeepForum.com
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Unread 07-22-2013, 02:01 PM   #1
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89 Wrangler YJ 6 Cylinder dies

Can someone give me some advice on my 89 Wrangler YJ. Its a 6 Cyclinder.
Starting about 6 months ago (when coincidentally I had the gas tank removed for welding), my YJ dies when it gets hot. It feel like someone just pulled the plug.
I repalced the Ignition Module under the coolant recovery tank, the wires, distributor cap, rotor and coil. It is still happening.
When it has sat for a while, usually half hour or more, it starts right back up.

I have been advised to look at the ignition switch, relays (although not sure where they are) remove gas cap for vapor lock as well as other ideas.

I know this problem is not unique and I want to see how others have solved it.
If it matters, I am still using the stock carb setup.

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Unread 07-22-2013, 02:14 PM   #2
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1990 YJ Wrangler 
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Location: New Mexico
Posts: 378
I would check into (and research) vapor lock. It may be an issue with the fuel tank vent since that was recently removed. It's a long shot, but is the only thing I can think of that would relate the tank removal with it dying.
1990 YJ Islander, 4.2L MC2100 DUI HEI, 2.5" RE lift, 31x10.50 DuraTracs, HandenFab rear bumper / swing-out, Tough Terrain
off-road camp trailer.
Build thread: http://www.jeepforum.com/forum/f22/tys-yj-build-1502554/
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Unread 07-22-2013, 02:18 PM   #3
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1987 YJ Wrangler 
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It could be a coincidence that it happened when the tank was removed, but not likely.

Are you exhibiting any other indicators that go just before or after it dies? Is the vehicle running hot? Does it hesitate? What else is happening? You said it happens when the vehicle gets "hot". How hot is "hot"? With the fuel filter being in the engine bay, and with the way the fuel lines are routed, I recently learned that you could actually evaporate the fuel in the line before it makes it to the carb. This happened to me when I was off roading recently and got dangerously close to overheating. The Jeep would just - die. It would fire right back up, and run fine, but 3-4 times it just up and died. Turned out that my engine bay had gotten so hot that it vaporized the fuel and I starved the engine.
1996 White ZJ
1987 Maroon YJ (sideways build)
1996 Forest Green XJ

The "sideways" build thread: http://www.jeepforum.com/forum/f22/r...hread-2164793/
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Unread 07-22-2013, 02:40 PM   #4
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1990 CJ7 
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When it dies next time, check for a spark
418 miles on 19 gallons of gas. Can't beat the BBD !
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Unread 07-22-2013, 02:56 PM   #5
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1988 YJ Wrangler 
Join Date: Jun 2013
Location: Whittier, CA
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Originally Posted by Old4X View Post
When it dies next time, check for a spark
+1. It's either not getting spark or not getting fuel. You're halfway to solving it when you figure out which.

I've seen ignition coils that would fail only when hot. In fact, any electrical component can do that. Mounting the coil on the engine block was a pretty dumb move IMO.
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dead , dies , ignition

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