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Unread 03-25-2015, 10:04 AM   #1
dhoepp
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1995 YJ Wrangler 
 
Join Date: Oct 2014
Location: Davenport, IA
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YJ Throttle body swap - problems

Hello,

So I pulled off a throttle body from a 4.0L '96 cherokee at a junkyard. I tried to swap it onto my 2.5L and I've ran into some problems.

There is a little nozzle on the east side that looks like a vacuum line. I don't have a hose for that. So I plugged it.

I replaced the sensors with the sensors from my 2.5L throttle body.

When I start the engine, it revs up over 4000 so I kill it. I don't want to let it run. It's not good to run it over 4000 with the engine cold.

Thank you for any and all help.

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Unread 03-25-2015, 11:36 AM   #2
VirginJeeper
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1995 YJ Wrangler 
 
Join Date: Aug 2011
Location: Arlington, Va
Posts: 397
I did a write up for this swap let me find it so you can see the one I used. I don't remember a vacuum port. Can you take side by side pictures of the throttle body for us and we can tell you what's what but you are on the right track swapping the sensors.

Edit: here is the link http://www.jeepforum.com/forum/f12/d...-2-5l-1507367/
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Unread 03-25-2015, 02:58 PM   #3
dhoepp
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Join Date: Oct 2014
Location: Davenport, IA
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This is the best picture I can provide right now. The 4.0 is on the right. There is a little silver bump off the right side of the right one. That is the new one.
img_4044.jpg  
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Unread 03-26-2015, 07:32 AM   #4
JDThomp
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1994 YJ Wrangler 
 
Join Date: Mar 2013
Location: Panama City, Florida
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I've done this swap on seven jeeps. you need to take the Idle air control off and clan it our thoroughly with break/carb cleaner. Sometimes they get stuck while your messing with them from built up gunk. I've had this happen three different times and that solved it. Also might try using the TPS off the new throttle body instead of the old one, im pretty certain they are the same.
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Unread 03-26-2015, 08:57 AM   #5
1320yj
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Take that thing apart and totally clean it up inside and out with carb cleaner , reinstall with the 2.5 sensors and adjust the TPS also make sure there are on vacuum leaks .
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Unread 03-26-2015, 09:12 AM   #6
VirginJeeper
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Location: Arlington, Va
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So I see that nipple on the side. I can safely say I have never seen it before. Where does it go in the TB? I guess plug it but I can't say it will work as I've never used that before. As stated by everyone else take the time to clean everything really well as it makes a difference. If you are experiencing higher idle at the beginning don't worry too much, check for vacuum leaks as stated a can of carb cleaner is the easiest way, this is of course after cleaning the TB and sensors, make sure the new TB is seated correctly and disconnect the battery for a minute or so and then start fresh. I was told the ecu will need to relearn the new air ratio mixture.
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Unread 03-26-2015, 12:37 PM   #7
dhoepp
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1995 YJ Wrangler 
 
Join Date: Oct 2014
Location: Davenport, IA
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The nipple goes under the butterfly valve, which would let a tiny bit of air in with the valve closed. However, the oxygen sensor tunnel on the other side is always opened. So I can't imagine that having a huge impact on it. Regardless, I closed the nipple with silicone epoxy and a screw.

Also, I pulled the TB off an automatic cherokee.

Last edited by dhoepp; 03-26-2015 at 12:38 PM.. Reason: addition
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Unread 03-26-2015, 12:42 PM   #8
dhoepp
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1995 YJ Wrangler 
 
Join Date: Oct 2014
Location: Davenport, IA
Posts: 33
I just did some research, and I think it is the IAC. If you look in the picture, you will see its facing one direction on my old throttle body and the other direction on the new one. Could the direction matter?
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Unread 03-26-2015, 04:00 PM   #9
JDThomp
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1994 YJ Wrangler 
 
Join Date: Mar 2013
Location: Panama City, Florida
Posts: 14
The "nipple" in question is a vacuum port that operates a sensor on the original jeep for the cruise control, blocking it off to prevent a vacuum leak. Also, the Idle air control valve can go in either way, but the connector is intended to face outward.
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