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Old 02-24-2013, 06:24 PM   #1
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Throttle Body Upgrade?

So is it true? Does upgrading to a 4.0 throttle body help my 4 banger? Its a 93 Jeep YJ with the 2.5 liter engine and I'm running on 31's. Also I still have the stock fan. But what exactly does the upgrade do? What year, makes, and models can I get one from? What sensors do I use? Do I also need a throttle body spacer? I have my jeep for off road use only so will it make a difference? Any help would be greatly appreciated.

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Old 02-24-2013, 06:49 PM   #2
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Originally Posted by rmeier
So is it true? Does upgrading to a 4.0 throttle body help my 4 banger? Its a 93 Jeep YJ with the 2.5 liter engine and I'm running on 31's. Also I still have the stock fan. But what exactly does the upgrade do? What year, makes, and models can I get one from? What sensors do I use? Do I also need a throttle body spacer? I have my jeep for off road use only so will it make a difference? Any help would be greatly appreciated.
I think u can use one off a TJ , but I'm not sure I want to do the upgrade also!

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Old 02-25-2013, 02:45 AM   #3
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I swapped my TB out for a 4.0 version and I only noticed a slight difference in take off. Not worth doing unless you're already in there doing something else.
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Old 02-25-2013, 07:50 PM   #4
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I swapped my TB out for a 4.0 version and I only noticed a slight difference in take off. Not worth doing unless you're already in there doing something else.
So just a spacer for the 2.5 TB will do , no use I. Getting the 4.0TB?
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Old 02-27-2013, 12:35 PM   #5
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Has anyone else out there done this modification?
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Old 03-03-2013, 09:30 PM   #6
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All this process does is confuse the intake into thinking there is a bigger motor and it needs more fuel, the fuel regulates normal during normal driving however if you use the Jeep for off road only and you are in 4x4 low a lot, It uses more fuel but it has more torque. I wouldn't recommend it unless your doing other stuff like as well like better cam or electric fan.
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Old 03-04-2013, 09:49 AM   #7
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All this process does is confuse the intake into thinking there is a bigger motor and it needs more fuel, the fuel regulates normal during normal driving however if you use the Jeep for off road only and you are in 4x4 low a lot, It uses more fuel but it has more torque. I wouldn't recommend it unless your doing other stuff like as well like better cam or electric fan.
Thanks
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Old 03-04-2013, 12:35 PM   #8
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I just did this mod recently, Got a 4.0 TB from ebay for 20 bucks bored it out so its the same size opening both sides and swapped over the sensors from the 2.5 TB. put it on and drove around idle seemed smoother and throttle response was better even with the 4.10 gearing and 33's. Worth the 20 bucks and hour of my time.
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Old 03-04-2013, 01:31 PM   #9
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Get a t body off of a similar year cheerokee or wrangler. As long as its got the four bolt pattern. Keep and use your tps iac and housing from the 2.5l and use them on the 4.0
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Old 03-05-2013, 12:58 AM   #10
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so how does that work, They work better on each other?
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Old 03-05-2013, 08:25 AM   #11
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So does the 4.0 TB ON A 2.5 really actually worth this mod ?? As A DD or trail rig??
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Old 03-05-2013, 08:34 AM   #12
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last weekend i swapped my 2.5l for a 4.0 throttle body, ground my intake wider to match the 4.0 tb, installed orange top ford 19lb fuel injectors, opened up the air box by removing the diverters. Also have electric fan upgrade done. All these mods together have made a much improved 2.5l engine for me, i can really feel a big difference in performance now and glad i did these mods as my jeep runs much stronger now. Also have 4.88 gearing on 33s....
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Old 03-05-2013, 08:41 AM   #13
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So does the 4.0 TB ON A 2.5 really actually worth this mod ?? As A DD or trail rig??
If you just do the 4.0 throttle body mod you will probably notice a slight difference. You really need to open up the intake to match the wider opening of the 4.0 tb. ( i used my dremil and stuffed rags in the intake and used a shop vac to catch the filings) slightly more fuel with the 19lb injectors and the 4 hole spray pattern makes a difference also. Do the mods i mentioned above and you will get better performance for sure. They are all actually pretty easy to do. The 4.0 tb swap is very simple just be sure to swap over the 2.5 sensors or your idle speed will be way too high.
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Old 03-05-2013, 10:25 AM   #14
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If you just do the 4.0 throttle body mod you will probably notice a slight difference. You really need to open up the intake to match the wider opening of the 4.0 tb. ( i used my dremil and stuffed rags in the intake and used a shop vac to catch the filings) slightly more fuel with the 19lb injectors and the 4 hole spray pattern makes a difference also. Do the mods i mentioned above and you will get better performance for sure. They are all actually pretty easy to do. The 4.0 tb swap is very simple just be sure to swap over the 2.5 sensors or your idle speed will be way too high.
And what about the injectors how easy and were would I get those from?
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Old 03-05-2013, 11:01 AM   #15
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The injectors were not too bad to do. If i had to remove them again it would be easy. You have to remove the fuel rail and a bracket that holds the throttle cable on mine. The injectors may be stubborn to get out at first. but they just simply pop in and out. I got my injectors off a 1993 f150 5.0l...they are orange top...i think yellow top ones off a mustang or crown vic work also. You want to make sure the injector's have 4 small holes rather than just one like our stock injectors have. There are some good threads on which injectors you want to use.
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Old 03-05-2013, 01:21 PM   #16
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The injectors were not too bad to do. If i had to remove them again it would be easy. You have to remove the fuel rail and a bracket that holds the throttle cable on mine. The injectors may be stubborn to get out at first. but they just simply pop in and out. I got my injectors off a 1993 f150 5.0l...they are orange top...i think yellow top ones off a mustang or crown vic work also. You want to make sure the injector's have 4 small holes rather than just one like our stock injectors have. There are some good threads on which injectors you want to use.
Ok thanks, how do you get them out just pull or what?
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Old 03-05-2013, 01:47 PM   #17
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Yea jus pull them straight back maybe a little wiggle.
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Old 03-06-2013, 12:50 AM   #18
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Yea jus pull them straight back maybe a little wiggle.
10-4 thank good buddy
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Old 03-07-2013, 02:22 PM   #19
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So what year, make, and model can we get a 4.0 TB from?
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Old 03-07-2013, 03:58 PM   #20
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Got mine off a 95 cherokee...as long as the bolt pattern matches up and you switch the 2.5 sensors over you should be good. That being said i was looking for one in the year 92-95 cherokee/wrangler. My jeep is a 93 wrangler.
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Old 03-07-2013, 06:06 PM   #21
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So will modifying the throttle body or the fuel injectors mess with the computer system?
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Old 03-07-2013, 06:32 PM   #22
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There are some really good threads on that exact topic you should check out. As far as i understand the injector swap is mainly for the 4-hole spray pattern which burns more complete, also they do deliver slightly more fuel under higher rpms(the computer runs lean at top end) so you will be able to pull longer into the rpm range and make power. The 4.0 TB is the same as the 2.5 just a bigger mouth for more air, you should also grind the intake to match to get full benefits of your air flow upgrade! I have done these 2 mods plus many others. I think electric fan, 19lb four hole injectors and throttle body upgrade (match intake for bonus) are 3 must do's if you want more performance from the little 2.5l.....some say the computer adjusts back to compensate your upgrades but i dont think so...my jeep has been kickin ass since i did these mods lol
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Old 03-07-2013, 06:44 PM   #23
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Thanks for the input. I'll check the threads out. Now what do you mainly use your jeep for. My strictly off road and I'm wondering if it'll help on the trails or climbing rocks?
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Old 03-07-2013, 06:47 PM   #24
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How are those 488's working? Im running 33's w/410's. Thinking 456's to keep it streetable.
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Old 03-07-2013, 06:52 PM   #25
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I guess around 40% offroad play more like mountain trails type stuff for me. Not too much big boulder climbing/rocks . Its is my daily driver at least 3 days a week also. I live in the outskirts of my city so i can almost consider my driveway offroading sometimes lol...some say you may lose some lower end torque but if feels like a all around improvement for me.
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Old 03-07-2013, 07:00 PM   #26
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How are those 488's working? Im running 33's w/410's. Thinking 456's to keep it streetable.
4.88s are doin a good job for me sometimes i wish first gear was even lower but for what i get into its good to go.
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Old 03-09-2013, 11:03 PM   #27
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Thanks for the input. I'll check the threads out. Now what do you mainly use your jeep for. My strictly off road and I'm wondering if it'll help on the trails or climbing rocks?
The upgrade was worth the time and I haven't done the fan and new injectors but want to I would really like to feel the difference with all the mods together. As far as wheeling and daily driven Its a wheeling project only. However, I ride logging trails and the kiamichi mountains are 30 min. From me.
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Old 03-23-2013, 11:36 AM   #28
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last weekend i swapped my 2.5l for a 4.0 throttle body, ground my intake wider to match the 4.0 tb, installed orange top ford 19lb fuel injectors, opened up the air box by removing the diverters. Also have electric fan upgrade done. All these mods together have made a much improved 2.5l engine for me, i can really feel a big difference in performance now and glad i did these mods as my jeep runs much stronger now. Also have 4.88 gearing on 33s....
Where are the diverters in the air box?
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Old 03-24-2013, 02:26 PM   #29
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where are the diverters in the air box?
x2
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Old 03-24-2013, 03:42 PM   #30
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It sounds like if you have them they will be in the air hose that connects to the throttle body and where the airbox draws air in before the filter.

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