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Old 03-31-2009, 04:54 PM
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Exclamation Starting Issue

90 Jeep Wrangler
4.2L 6C

I can't get my Jeep to start. When I initially go outside to start it up, it catches immediately but dies out in a second, almost instantaneously. Then I go to try and start it again, but regardless of how many times I crank the ignition it just turns over and won't catch. It turns over great, and the battery is less than a year old and the starter is practically brand new (maybe a month old). I put dry gas in it today thinking perhaps I have water in my lines and/or tank.

Interesting thing is, if I go out today and try and start it, it catches but then dies like I said. Then it won't catch for the rest of the day. However if I go out tomorrow and try again, same thing happens. It catches the first time but dies right away and then won't catch again. Its been happening like this for the past couple of days. I tried starting fluid today sprayed into the carb (removed air filter and opened two valves and shot fluid down pipe for two seconds). Didn't seem to affect anything.

Any ideas?
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Old 03-31-2009, 06:07 PM   #2
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You need fuel and fire to run. Disconnect the fuel line at the fuel rail to the injectors and turn the key on. It should squirt gas for a second then stop. If you do not get this then check fuses for fuel pump, fuel pump wiring and fuel pump. If you get fuel each time, then you need fire so check plugs, wires, cap, rotor button, and power to coil and distributer. Good luck!

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Old 03-31-2009, 06:08 PM   #3
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Just realized that you have a carb but same applies. Disconnect at carb to verify that you have fuel to carb.
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Old 03-31-2009, 07:42 PM   #4
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fuel and spark, check spark at the wires also. figure out whats missing. you also need compression and the right timing, but lets assume thats ok for now. check spark and fuel
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Old 04-01-2009, 06:35 AM   #5
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pull a spark plug and check for spark, have a friend help you while you connect the plug back to the boot,and ground the base of the plug. then have your buddy turn it over you should have spark. If no spark the first thing probably is the ignition box near the washer reservoir.
To check for fuel remove the fuel line from the carb and have your buddy turn it over to see if you have fuel pressure,if not do the same before the fuel filter to make sure the filter is not plugged.
I am guessing it probably is your ignition box,I used to carry a spare when I drove carbed cj's.
good luck.
If your plugs are soaked with gas when you check for spark you know that you are getting fuel and the plugs may need to be replaced because it is flooded,sometimes you can dry them out and clean them. How old are the plugs?
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Old 04-02-2009, 07:15 AM   #6
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Although this sounds like a fuel filter, if it ends up being the control module you should try to find a genuine Duraspark box at a junkyard. The ones the big box stores have are crappy.

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