Topic: Doing the throttle body switch.

[dexetr30]

Went to the scrap yard today and pulled a 4.0L throttle body from a Cherokee. I'll be doing the swap this weekend hopefully. I read through the column Jeffy wrote on making the switch. Everything seems straight forward and simple enough. Anybody have an advice to add before I go ahead and do this? I think Jeffy covered everything but if anyone ran into anything, I'd like to know about it. Also, what kind of change in power should I be looking for once I'm through?

[Sidscan]

Make sure you get a new TB gasket.  Either reuse all your old sensors or use all of the ones off the new one.  I don't recomned mix and match.  When I got mine the sensors were the flat type and your's are probably the round type.  Take apart the new one and clean it real good.  At one point someone suggested using brake fluid to soak in.  It is real easy.  The throttle and auto trans just snap out, the sensors unplug and the four bolts unbolt.  Back together the same way.  Take the old TB out before unbolting the sensors it will be real easy then.

[moosin88]

hope you have better luck tham me i did this swap now the idles like crap engine light comes on and sputters at 2000rpm and 4000 rpm. still trying to diognos problem let me know how you make out.

[Sidscan]

I would not be afraid of doing the change.  Definitely will see a difference at Freeway speed initally.  And with your new open filter it will sound throatier.  I went back and forth between the stock filter box and rusty intake because I thought that was my idle problem.  I finally decieded to change my front O2 senor.  That improved the idle after reseting the computer and after multiple start ups.  After about a month and half I still have a slight idle jump but it is much much better.  

Observations 2 months after install and about 1000 miles below.  I don't drive long distances.

I have not noticed much mpg changes still getting 15-16 mpg .  I do drive a lot of hills here in Seattle and have noticed the low end torque with the auto to be much better going up the steeper hills.  Geting to top hwy speed (45-50)on flat ground is what I notice as the most improved.  My freeway speed increase seems to be less noticable now.   Could be cause the top is down all the time  :D .   Rain is coming to our area soon and hard top will be going on  :cry:.  Hope it will help the gas mileage.

I am not sorry I made the tb, spacer and intake change.  If you have them you will find it easy to do.  I would ignore some of the other websites on the worthlessness of the upgrade because their opinion is largely coming from a 6 cylinder perspective. :twisted: Aloha

[dexetr30]

I would not be afraid of doing the change.  Definitely will see a difference at Freeway speed initally.  And with your new open filter it will sound throatier.  I went back and forth between the stock filter box and rusty intake because I thought that was my idle problem.  I finally decieded to change my front O2 senor.  That improved the idle after reseting the computer and after multiple start ups.  After about a month and half I still have a slight idle jump but it is much much better.  

Observations 2 months after install and about 1000 miles below.  I don't drive long distances.

I have not noticed much mpg changes still getting 15-16 mpg .  I do drive a lot of hills here in Seattle and have noticed the low end torque with the auto to be much better going up the steeper hills.  Geting to top hwy speed (45-50)on flat ground is what I notice as the most improved.  My freeway speed increase seems to be less noticable now.   Could be cause the top is down all the time  :D .   Rain is coming to our area soon and hard top will be going on  :cry:.  Hope it will help the gas mileage.

I am not sorry I made the tb, spacer and intake change.  If you have them you will find it easy to do.  I would ignore some of the other websites on the worthlessness of the upgrade because their opinion is largely coming from a 6 cylinder perspective. :twisted: Aloha

Thanks Sidscan. I'll do the swap this weekend. I'll throw a few hundred mile drive into it just to help it relearn everything it needs to. I'll post my results when it's finished.

[/dev/null]

You do want to swap everything off the old TB, including the air bypass for idle control. If you don't you'll find yourself idling at about 2000RPM  :wink:
The computer is somewhat adaptive, so disconnecting the battery while you work on it will reset it, and it will learn and adapt to the new TB.

Peter

[jwrape]

You do want to swap everything off the old TB, including the air bypass for idle control. If you don't you'll find yourself idling at about 200RPM  :wink:
The computer is somewhat adaptive, so disconnecting the battery while you work on it will reset it, and it will learn and adapt to the new TB.

Peter

Yea, definately re-use all your old sensors. It sux cause you have to have that special torx bit to get one of them off. :roll:

[JeepinChobot]

I did the swap a week or two a go. my idle wanders in a 200 rpm range, the oil pressure goes with it, but this was happening before the swap too.

Now im getting an ignion kit from PD come monday!!!

Back to the swap, it was easy. I only changed out the idle control motor and it seems the same right now but thats because i dive only 1.5 miles or so to work.

[turbo-daddy]

Sorry, new to the swap issue.  What is the benefit to the TB swap??  Pros and cons??

[dexetr30]

So far in my case, no cons.

Pros... Quicker throttle response, better exceleration, MUCH better top end power so it's far better for me on long trips.

Some people have problems when they do the swap but I think they may have had troubles prior and doing the swap just bought them out. I have had no trouble what so ever.