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Unread 04-10-2013, 04:45 PM   #1
1993moneypit
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1993 YJ Wrangler 
 
Join Date: Apr 2013
Location: statesboro, ga
Posts: 4
loosing power, fuel problem?

i have a 1993 wrangler yj with the 4.0 inline 6. i got it right around thanksgiving and have been having trouble with it ever since. the guy before me said he had just rebuilt the motor, i have decided this was total BS. it started having major problems with loosing power and was making wierd noises. being at college i didnt have all my tools so i took it to a shop to get an idea of what could be wrong and they said that it was a fuel problem and it needed a new fuel pump and the fuel rail cleaned. so i dropped the fuel tank and changed out the fuel pump, then i changed the fuel filter and cleaned the fuel rail. the problem got a lot better but was not completely right. i would drive it for about 10 to 15 miles and it starts cutting out and will eventually shut off, but i can start it back up and it will do the same thing all over again. so i changed the fuel regulator and cleanded the throttle body. got a little better but still is doing the samething. i am lost on what else it could be, anyone have any ideas?

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Unread 04-10-2013, 05:28 PM   #2
minerbob
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2014 JK Wrangler 
 
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Crankshaft position sensor bad?
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Unread 04-10-2013, 05:36 PM   #3
1993moneypit
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1993 YJ Wrangler 
 
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Location: statesboro, ga
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not sure i havent checked that, do know where that would be located? the only other thing i can think of is i didnt change the pick up screen on the bottem of the fuel pump inside the tank. could that be the whole problem
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Unread 04-10-2013, 05:41 PM   #4
Chrisnvegas
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1992 YJ Wrangler 
 
Join Date: Dec 2012
Location: Sin City, Nv
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I have had multiple problems with aftermarket fuel pumps. Got tired of pulling fuel tanks twice in the same month. New fuel pumps can crap out within a couple weeks without a new fuel filter and screen.

I now only use original equipment fuel pumps. They cost more but I only have to do them once.
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Unread 04-10-2013, 05:55 PM   #5
1993moneypit
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1993 YJ Wrangler 
 
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Location: statesboro, ga
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the fuel pump as only been installed for 4 days and it didnt fix the problem just seemed to make it a little better.
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Unread 04-10-2013, 06:09 PM   #6
Mark05059
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1989 YJ Wrangler 
 
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Location: quechee Vermont
Posts: 4,325
you sure its a fuel problem and not a clogged cat?
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Unread 04-10-2013, 06:23 PM   #7
1993moneypit
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1993 YJ Wrangler 
 
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at this point idk what it could be lol. it dosnt have a cat though just a magnaflow muffler
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Unread 04-11-2013, 09:40 AM   #8
minerbob
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When the CPS gave up on my '94 4.0 several years ago, it behaved the same way. It would restart when it cooled off and die after 10 or 15 minutes of running. Should show a code. I believe it is on the front of the engine.
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Unread 04-11-2013, 10:59 AM   #9
Que89YJ
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1989 YJ Wrangler 
 
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Check your codes:
http://www.jeepforum.com/forum/f12/h...codes-1257145/

The crank postion sensor is on the rear of the blok at the top of the bell housing. It is a common issue with stalls. It doesn't always set a fault code.
Look at this search for a pic:
http://www.google.com/search?q=site:...w=1584&bih=625
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Unread 04-11-2013, 08:33 PM   #10
Boanerges
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1992 YJ Wrangler 
 
Join Date: Dec 2009
Location: St Cloud, FL, Florida
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Quote:
Originally Posted by Que89YJ View Post
Check your codes:
http://www.jeepforum.com/forum/f12/h...codes-1257145/

The crank postion sensor is on the rear of the blok at the top of the bell housing. It is a common issue with stalls. It doesn't always set a fault code.
Look at this search for a pic:
http://www.google.com/search?q=site:...w=1584&bih=625
Yes the CPS is on back of bell housing. Also before you plug the new one in, take a pair of pliers and gently squeeze the receiving end of the plug (female end) to make the little metal connectors inside fit the pins a little tighter. I chased an electrical issue with new cps for about 2 months before doing this and haven't had a problem with lost signal since. If it loses signal, it loses spark which causes drop offs and cut outs.
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