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-   -   loosing power, fuel problem? (http://www.jeepforum.com/forum/f12/loosing-power-fuel-problem-1507343/)

1993moneypit 04-10-2013 04:45 PM

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?

minerbob 04-10-2013 05:28 PM

Crankshaft position sensor bad?

1993moneypit 04-10-2013 05:36 PM

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

Chrisnvegas 04-10-2013 05:41 PM

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.

1993moneypit 04-10-2013 05:55 PM

the fuel pump as only been installed for 4 days and it didnt fix the problem just seemed to make it a little better.

Mark05059 04-10-2013 06:09 PM

you sure its a fuel problem and not a clogged cat?

1993moneypit 04-10-2013 06:23 PM

at this point idk what it could be lol. it dosnt have a cat though just a magnaflow muffler

minerbob 04-11-2013 09:40 AM

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.

Que89YJ 04-11-2013 10:59 AM

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

Boanerges 04-11-2013 08:33 PM

Quote:

Originally Posted by Que89YJ (Post 15281101)
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

:thumbsup: 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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