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Unread 02-04-2014, 03:16 PM   #1
90JYerv6
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pls help, engine bogging

Hello and thanks for taking the time to read this.
ok so I just bought my first 90 YJ and I absolutely love it im working on getting it tuned up and is all going well. The main problem I have right now is that the engine boggs every time I dive it, it also takes a few tries to start it when I first try to start it for the day. Im guessing its a fuel problem I already disconnected the fuel line and plenty of fuel comes out I put a injector cleaner that is in right now. I was looking for the fuel filter and it does not seem to have one from what I understand its supposed to be on the rear driver side correct? Well I followed the whole fuel line and could not find one. I was wondering too if its ok to put a universal one or should I buy a stock one? The air filter is fine I just changed it. Its a 4.2 engine any ideas what I could check on next? The jeep runs like a beast other then that bogging that it does. Your help is truly appreciated. Thanks again.

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Unread 02-04-2014, 03:18 PM   #2
WNUNEZJR
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02 senor maybe?
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Unread 02-04-2014, 06:35 PM   #3
The_Goob
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the fuel filter has its own skidplate even, look by your drivers side rear spring hanger on the frame, right in front of back tire. the ebrake cable runs right through a slot in the plate too.
this is it minus the little skid plate
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Unread 02-04-2014, 09:50 PM   #4
90JYerv6
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U guys know where the O2 sensor for this one is? I know in other cars is on the intake but I dont see any on there?....ill keep looking for the fuel filter tomorrow when there is light. Thanks for your help....anyone else has any ideas of what it could be?....it seems like the warmer the engine is the less it does it.....seems like.
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Unread 02-04-2014, 09:55 PM   #5
dander88
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Is it doing this when the motor is cold? Warm? Both?
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Unread 02-04-2014, 09:55 PM   #6
Mark05059
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ok so you say you have the 4.2.. Its hard to see from the picture but is your jeep injected or carb'd
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Unread 02-04-2014, 10:20 PM   #7
90JYerv6
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It seems like it mostly does it when its cold and its fuel injected
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Unread 02-04-2014, 10:23 PM   #8
WNUNEZJR
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Quote:
Originally Posted by Mark05059 View Post
ok so you say you have the 4.2.. Its hard to see from the picture but is your jeep injected or carb'd
it looks carb'd and I have no clue go to napa and have them pull up a diagram.
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Unread 02-04-2014, 10:30 PM   #9
90JYerv6
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Its fuel injected, the fuel rail is next to the black valve cover (wich I just painted yesterday since I changed the seal)
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Unread 02-04-2014, 11:18 PM   #10
DirtyYj91
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Okay first I would ask what build date is your YJ ? because being a 90 that would be a Carbureted 4.2L but your pictures are obviously the same as my 91 4.0L injected engine.
I had the same issue with mine and I thought it was fuel pump but low and behold it was not.
Search ECM capacitor repair in this forum I am 99% sure that is what you need to do.
My only 1% reserve is not knowing what part of the country you are in.
It helps to fill out your profile for better response to questions.
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Unread 02-04-2014, 11:29 PM   #11
90JYerv6
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Sounds good dirty YJ ill look for that post....btw im in southern California. Ill fill out my profile soon. Thanks for your help and yes I dont think its the original engine since I researched and this year was only made with the carbonated engine.
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Unread 02-05-2014, 07:07 AM   #12
Que89YJ
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With that fuel injection you are running an injection setup from a 91/95 xj/yj. First thing to check is to see if the previous owner hooked up the check engine light so you can get codes there is another way to do it if not. Follow the instuctions on this thread and post back:
http://www.jeepforum.com/forum/f12/h...codes-1257145/
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Unread 02-05-2014, 02:16 PM   #13
90JYerv6
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I just did what is showed on the video and no lights on the dashboard came on the previous owner probably didn't connect them
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Unread 02-05-2014, 04:46 PM   #14
Que89YJ
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Ok, you need to get a test light and enough wire to hook one side up to the positive side of the battery and the other to the ecu harness. I will walk you through how to hook it up so you see the codes just like the cel.
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Unread 02-05-2014, 07:17 PM   #15
WNUNEZJR
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Quote:
Originally Posted by Que89YJ View Post
Ok, you need to get a test light and enough wire to hook one side up to the positive side of the battery and the other to the ecu harness. I will walk you through how to hook it up so you see the codes just like the cel.
This ^^^ guy sounds like he knows what hes talking about. and I though all 4.2 were carb'd
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