Cj wont stay running! Help! - JeepForum.com
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post #1 of 18 Old 11-29-2009, 04:23 PM Thread Starter
trueprimitive
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Cj wont stay running! Help!

I have a 75 CJ5 with a 258 that i am selling. I had a guy coming to look at it today so I went out this morning and took her for a drive down the road to check everything out since i hadnt driven it in a while. After I got back home i try to start it back up again and it starts every time but will not stay running! Sometmes it will run for 5 minutes and other times it will cut off right after it starts. It dosent sputter or anything just cuts off like you turned the key off. I have a new carburetor and a new fuel pump so it cant be gas. The ignition module and the coil are new on the ignition system along with a new alternator. I cant figure this thing out and i really need to sell this thing. What could it be?

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post #2 of 18 Old 11-29-2009, 04:43 PM
mmerlina
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What kind of carb is on there? Also, check your fuel filter..

Mike

1986 Jeep CJ7 (photos)
Remanufactured 258, ARB lockers front & rear, 4.10 Yukon gears, 35x12.5" Super Swamper SSR's, Motorcraft 2100, 4.5" Rubicon Express Extreme-Duty lift, York 210 OBA, Big Daddy steering, Tatton rear CV driveshaft, Herculined interior, TJ flares, lots of body & upholstery work
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post #3 of 18 Old 11-29-2009, 06:25 PM
nshefbuch
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Quote:
Originally Posted by trueprimitive View Post
I have a 75 CJ5 with a 258 that i am selling. I had a guy coming to look at it today so I went out this morning and took her for a drive down the road to check everything out since i hadnt driven it in a while. After I got back home i try to start it back up again and it starts every time but will not stay running! Sometmes it will run for 5 minutes and other times it will cut off right after it starts. It dosent sputter or anything just cuts off like you turned the key off. I have a new carburetor and a new fuel pump so it cant be gas. The ignition module and the coil are new on the ignition system along with a new alternator. I cant figure this thing out and i really need to sell this thing. What could it be?


not sure but does it have a ballast resistor? my older cj5 does and it would do the same thing when the resistor went bad. if so, simple $2 fix.
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post #4 of 18 Old 11-29-2009, 08:31 PM
Cutlass327
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Quote:
Originally Posted by nshefbuch View Post
not sure but does it have a ballast resistor? my older cj5 does and it would do the same thing when the resistor went bad. if so, simple $2 fix.
Or like mine, a loose connection at the ballast resistor...

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 #5 of 18 Old 11-29-2009, 08:38 PM Thread Starter
trueprimitive
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This may sound kinda stupid but......what is a ballast resistor and how do you change it?
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post #6 of 18 Old 11-29-2009, 08:47 PM
brian613
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might have been done but how are your connections to the battery? are they clean and tight?
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post #7 of 18 Old 11-29-2009, 09:02 PM
Cutlass327
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The ballast resistor is a ceramic rectangular piece (mine is mounted on the firewall on driver side) that is in the wire that goes to the coil from the ignition switch run position. Here's a link, hope it works to show..

[IMG]file:///C:/DOCUME%7E1/Owner/LOCALS%7E1/Temp/moz-screenshot.png[/IMG]http://www.autozone.com/autozone/catalog/accessories/accessoriesShelf.jsp?categoryDisplayName=Performan ce&fromType=accessories&fromString=search&parentId =8-10&filterByKeyWord=ballast&currentPage=1&navValue= 100781&categoryNValue=100008&fromWhere=&itemId=781-10&displayName=Ballast+Resistor

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 #8 of 18 Old 11-30-2009, 12:28 PM Thread Starter
trueprimitive
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OK i checked the lines to the coil and i dont have a ballast resistor on the line. I have the carter YF carburetor with no fuel filter but i dont think its fuel because it dosnt sputter or anything just cuts clean off. What now?
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post #9 of 18 Old 11-30-2009, 01:28 PM
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you don't have a fuel filter at all?
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post #10 of 18 Old 11-30-2009, 01:32 PM Thread Starter
trueprimitive
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No i dont have a fuel filter at all.
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post #11 of 18 Old 11-30-2009, 02:06 PM
brian613
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you probably clogged up the fuel jets in your carb.. get someone to try and start it while your looking down the throat and see what kinda fuel spray it has it should be a good strong spray if its not spraying good it can just cut out without sputtering.

you really need a fuel filter on there otherwise your gonna wind up junking that carb......
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post #12 of 18 Old 11-30-2009, 02:48 PM
Evian
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Chances are that it is something really simple like a loose battery cable or wire. Sounds to me your Jeep doesn't want to leave yet.
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post #13 of 18 Old 12-07-2009, 01:04 PM Thread Starter
trueprimitive
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Ok I have further diagnosed the problem with the ignition. The motor will stay running until it gets warm but then it cuts off (no sputter or nothing). It will crank every time but will not stay running after the motor is warm. Any ideas?
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post #14 of 18 Old 12-07-2009, 01:28 PM
jkoch8819
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it is your ignition module.... Or the connector to it... It is a very common problem with stalling and quiting after it gets warm... If you have a auto zone or something they can usually be tested....

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**The Only Thing Snow is good for is to check if the Jeep is Leaking**
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post #15 of 18 Old 12-07-2009, 01:30 PM
jkoch8819
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Not 100% sure but also check the condenser..
Also after it warms up and not start are you getting any spark?

All Jeeps are Jeeps, But built Jeeps are Real Jeeps... Round or Square
**The Only Thing Snow is good for is to check if the Jeep is Leaking**
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