Engine dies after about 10 minutes... Why? - JeepForum.com

 
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post #1 of 6 Old 12-20-2009, 04:05 PM Thread Starter
Bic05
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1977 CJ5 
 
Join Date: Apr 2009
Location: Texas
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Engine dies after about 10 minutes... Why?

1977 CJ5 - 232

My Jeep will fire up and run, but after about 10 minutes of running (either sitting or driving) it dies and does not want to start. It has gas. When I get it started (have to pour gas in the carb) it only runs for about 15 seconds and then dies again. Fuel pump and fuel filter are new. If I wait a day or so and start it, it will run for about 10 minutes and die again. What is going on?

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post #2 of 6 Old 12-20-2009, 04:07 PM
jeepwhore
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1984 CJ7 
 
Join Date: Jun 2006
Location: Kamloops
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Get your ignition module tested. Located on the driver side inner fender below the windshield washer resevoir.

'84 CJ-7: Yota axles (spartan locked front, e-locked rear) 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rebuilt 4.2/4.0 hybrid, AX15 and twin sticks/clocking ring waiting to go in.

The advertised position for a topless, dirty jeep girl has been filled......by my wife. Thanks to all that applied.
<------------and yes, that is her.
:-D
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post #3 of 6 Old 12-20-2009, 04:18 PM
Cutlass327
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How many vacuum lines are plugged under your hood??? Unplug the vent line for the fuel tank. Having to pour fuel into the carb tells me it is a fuel issue not an ignition issue. The reason it runs for a few seconds is it is running off the fuel you dumped in the carb..

Another thing I experienced once was the crud in the fuel tank would build up on the pickup sock in the tank and shut the car down. After it sat a bit the crud would fall away and allow me to drive for a short distance until it did it again. Had to drop tank and clean it out before it'd be good to drive without worry.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

http://www.jeepforum.com/forum/f8/ri...8-cj5-1223197/
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post #4 of 6 Old 12-20-2009, 04:25 PM
jeepwhore
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Could be but the symptoms he describes sound exactly like a bad module. They will work fine until they heat up then crap out until they cool off after 20 or 30 minutes. Either way, two good places to start looking and two easy checks. Remove the vacuum line as suggested and if it still dies, unbolt the module from the fender and get it tested at your nearest parts store.

'84 CJ-7: Yota axles (spartan locked front, e-locked rear) 4" BDS, 1" Daystar & 3/8" shackle lifts, 35" X-Terrains on steelies, YJ Tub & family roll bar, heater blower upgrade, 4.2L w/MC2100 & Team Rush, Warn 8274. Rebuilt 4.2/4.0 hybrid, AX15 and twin sticks/clocking ring waiting to go in.

The advertised position for a topless, dirty jeep girl has been filled......by my wife. Thanks to all that applied.
<------------and yes, that is her.
:-D
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post #5 of 6 Old 12-20-2009, 04:37 PM
Cutlass327
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Quick test is leave the fuel cap off and driver for a bit.

Rick

1978 CJ5 5.0HO/T177/D300, '86 D30/D44 WT axles, 'glass body, 31x10.5 BFG A/T, TDK galv'd frame - DD and weekend toy

http://www.jeepforum.com/forum/f8/ri...8-cj5-1223197/
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post #6 of 6 Old 12-20-2009, 08:12 PM Thread Starter
Bic05
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Join Date: Apr 2009
Location: Texas
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Thanks for the help. What is unplugging the vent line going to tell me? If I unplug the vent line and it still dies, it's something else?
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