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Unread 08-14-2013, 06:39 PM   #1
Hammons_Adam
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1994 YJ Wrangler 
 
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Location: Lakeland, Florida
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94 Yj Bogging Down/Knocking

Hello everyone, This is my first time posting so please hang with me. so i have been having a problem with my YJ. In 2nd & 3rd gear, around 35MPH, i lose alot, if not all power. what i mean is all going along just fine and it bogs down. foot can be pressed to the floor, but nothing. If i take my foot all the way off and push back down it will 75% of the time power through. Also when it bogs down from right under my feet there is a knocking sound. Thoughts and Idea are most welcome. Need anymore Info will be happy to post it.

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Unread 08-14-2013, 07:38 PM   #2
pete1991YJ
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Welcome to JeepForum, you've just found one of the best jeep sites anywhere!

One of the first things I would do is check for any trouble codes the computer might have. Its easy and free, all you need is the key! Here's a video that shows how:
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Unread 08-14-2013, 07:58 PM   #3
Hammons_Adam
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I just checked my codes,
12 - Battery input to PCM disconnected during last 50 key starts.
33 - Fault in air conditioning cutout relay circuit.
55 - Completion of fault code display.
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Unread 08-14-2013, 09:41 PM   #4
bigbossd1030
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Do you have a catalytic converter still? Check it to see if anything is loose inside. It could be clogged up. Also what condition is your tranny fluid in.

Sent from my iPhone, probably because I am bored at work.
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Unread 08-15-2013, 06:43 AM   #5
pete1991YJ
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Quote:
Originally Posted by Hammons_Adam View Post
I just checked my codes,
12 - Battery input to PCM disconnected during last 50 key starts.
33 - Fault in air conditioning cutout relay circuit.
55 - Completion of fault code display.
Those codes are normal, you will see them every time. Next thing I would check is the fuel pressure and maybe change the fuel filter. The pressure should be 31 PSI at idle and go up to 39 PSI when you unhook the vacuum line from the regulator. The regulator is that little "vacuum can" type thing near the front of the fuel rail; you can rent the pressure tester from most auto parts stores. I think harbor freight even sells one for about $30.

The fuel sustem on these does not directly tie into the computer anywhere, so its one of the first things to check if you don't have any trouble codes. Also the cat converter can be plugged up, see if it rattles.
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Unread 08-15-2013, 08:19 AM   #6
Hammons_Adam
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Yes I still have a cat. I went and banged on it. Sounded pretty solid. And I've never checked my tranny fluid. To be honest, don't know how. Haha. As for the fuel pressure, I'll look into it.
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Unread 08-15-2013, 09:44 AM   #7
Hammons_Adam
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Also, I made this connection today. It could be nothing but I would like to get you guys input on this. My CCV elbows are leaking, and they are leaking right onto my fuel injectors. Could that have something to do with it?
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Unread 08-15-2013, 09:47 AM   #8
1ATony
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You may also want to check the timing with a timing light to see if it's set correctly.
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Unread 08-15-2013, 11:01 AM   #9
XJ93
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Which trans do you have? Auto? Manual? Fill out your profile a bit more please, this will help point to/eliminate areas of concern. If you have an auto pull the dipstick with engine running at operating temp. If you have a manual wait until the engine cools, and there is a plug that you will remove to check fluid. Where the plug is depends on which manual trans you have.
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Unread 08-15-2013, 01:50 PM   #10
Hammons_Adam
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It's a Manual 5 speed. As for a model I have no idea. Tell me how to find it an I'll let you know. Hahaha.
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Unread 08-15-2013, 01:57 PM   #11
XJ93
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Since you have the 4.0 it should be the AX-15.
http://www.jeepforum.com/forum/f12/y...6/#post8107878
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Unread 08-15-2013, 06:09 PM   #12
pete1991YJ
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I *really* doubt the tranny has much to do with it. And the timing also has little to do with it, since its controlled by the computer anyhow.
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Unread 08-16-2013, 11:35 AM   #13
XJ93
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Fuel filter...
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Unread 08-16-2013, 11:56 AM   #14
Que89YJ
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CCV will cause it to lose vacuum if you are leaking and give you fits. The breather tube in the rear might be plugged at well. You need to clean and seal the CCV and check the breather tube.

If both are good and you are blowing oil out of the top of the valve cover you could have a compression issue. I don't know how good you can turn a wrench but there are test that require special tools like a fuel pressure guage and a compression tested. They can be borrowed from any of the major auto parts stores for a fully refundable deposit.

Pay close attention to the bogging down issue. Does it happen when you are just starting it in the morning and it is cold or does it happen when it is hot/cold?
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Unread 08-16-2013, 05:31 PM   #15
Robob69
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I kinda had the same issue.. But mine would not pass emissions... So after all the dang changing everything.. I changed the Fuel Pressure Regulator and BAM!!! Fixed it... and I changed the Injectors a bit later just because i wanted to but it worked.. Just sayin...
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