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Unread 05-01-2013, 09:56 AM   #1
Charles88yj
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1988 YJ Wrangler 
 
Join Date: May 2012
Location: San José, Costa Rica
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4.2L carter carb float? help!

Hey guys, my brother recently got a 4.2L 89 yj, has the stock carb, the car is running good but when you are going downhill in the moment you stop going down and star going up the car turns off, and its a little difficult to start, then when it starts you can go up 3 hours and it won´t fail, just in the change of downhill to uphill, I heard this is about de float in the carb, how can I adjust this? is there any other problem that could cause this? thanks!

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Unread 05-01-2013, 10:52 AM   #2
jbolty
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1990 YJ Wrangler 
 
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I would start with cleaning out the idle tubes, it's a common problem.

http://www.jeeptech.com/engine/carter.html

http://www.instructables.com/id/Fix-...eep-cj-7-or-w/
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Unread 05-01-2013, 03:59 PM   #3
Old4X
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Yes the float is easily adjusted if that is the problem. It is done by bending the little tab on the pivot arm piece of the float. You remove the top of the carb to get to it.
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Unread 05-01-2013, 05:03 PM   #4
Charles88yj
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thank you! the idle is always good, so I don´t think that´s the problem, i`m gonna check this but it goes off when its running not when its in idle!
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Unread 05-01-2013, 05:08 PM   #5
jbolty
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Guesses:

Check the routing of the fuel hoses. If they are getting hot it might vapor lock.

Vacuum advance or mechanical advance in the distributor.

Is it an auto trans? If so maybe the torque converter is not unlocking.
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Unread 05-02-2013, 12:00 AM   #6
Fernando
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1987 YJ Wrangler 
 
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I know this Jeep, Charles is a friend. I would say start by adjusting the float level and cleaning the tubes... the Jeep is not auto, we need to do the timing properly as well, last time I timed it so we could start it after the nutter but I know we have to do it again. Jeep was parked for two years so in the beginning we were just trying to get it started and get it to burn some crap out of the system... now it is running much better and we can work on timing it more accurately.
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