Topic: Made the switch!

[dexetr30]

I put the 4.0L t.b. on this morning and..........It's a great success!!!!:D  I re-used all the old sensors bolted the new t.b. on, reconnected the battery, turned the key and it fired right up. I put my home depot intake back on and took it for a ride. Much better pulling the steep hills, quicker exceleration and what a nice sound.:twisted: I haven't taken it out on the highway yet. I'll do that soon though. I took it a bit past 4,000 rpm with no troubles. I'd highly recommend doing this swap to anyone who hasn't done so yet. And as stated by others, make sure to buy a set of torx bit drivers. I bought a new set the day I bought the Jeep.     :D

Next project will be the 19lb injectors. I'm going to look on ebay and at my scrap yard for those. :D

[jwrape]

I put the 4.0L t.b. on this morning and..........It's a great success!!!!:D  I re-used all the old sensors bolted the new t.b. on, reconnected the battery, turned the key and it fired right up. I put my home depot intake back on and took it for a ride. Much better pulling the steep hills, quicker exceleration and what a nice sound.:twisted: I haven't taken it out on the highway yet. I'll do that soon though. I took it a bit past 4,000 rpm with no troubles. I'd highly recommend doing this swap to anyone who hasn't done so yet. And as stated by others, make sure to buy a set of torx bit drivers. I bought a new set the day I bought the Jeep.     :D

Next project will be the 19lb injectors. I'm going to look on ebay and at my scrap yard for those. :D

Congrats on the upgrade.  My injectors should be here today. I hope to get them in on Sunday or Monday. :D  I will post up my findings.
Glad you got the TB on.

[Jeffy]

I hope when you said you reused all the sensors you swapped the IAS housing also.  Those are different and will cause problems if you don't use the right housing with the rigth IAS motor.'

My engine will rev all the way to the limiter if I let it.  You're really limiting yourself if you're shifting before 3000rpm all the time.

[jwrape]

I hope when you said you reused all the sensors you swapped the IAS housing also.  Those are different and will cause problems if you don't use the right housing with the rigth IAS motor.'

My engine will rev all the way to the limiter if I let it.  You're really limiting yourself if you're shifting before 3000rpm all the time.

If I remember correctly, if you swapped the sensors then you had to swap the IAS Housing as well because since they are different sizes they do not interchange.

[Jeffy]

If I remember correctly, if you swapped the sensors then you had to swap the IAS Housing as well because since they are different sizes they do not interchange.

You can put a 2.5L IAS motor in a 4.0L IAS housing but you can't put a 4.0L IAS motor in a 2.5L housing, I believe.  This is one of the major problems prople have when doing the swap.  Not to mention the tab at the bottom of the 4.0L IAS housing...

[dexetr30]

I reused the 2.5L housing. Is this going to cause a problem? It runs great right now. I just got back from about a 100 mile run with it on the highway and I really like the way it's performing.

[jwrape]

I reused the 2.5L housing. Is this going to cause a problem? It runs great right now. I just got back from about a 100 mile run with it on the highway and I really like the way it's performing.

Come to think of it I think I did that the first time I had it on as well. I beleive the housing is what has those security Torx screw, at which I didn't have a bit for the first time and left the other housing on anyways. Mine ran fine but was a little high on Idle, about 200rpms more.I changed it that evening and it went back to normal.
I don't know what the difference would be if you left it on and your idle is fine. Really all it does is regulate air flow at idle anyways. (I think)

[dexetr30]

I reused the 2.5L housing. Is this going to cause a problem? It runs great right now. I just got back from about a 100 mile run with it on the highway and I really like the way it's performing.

Come to think of it I think I did that the first time I had it on as well. I beleive the housing is what has those security Torx screw, at which I didn't have a bit for the first time and left the other housing on anyways. Mine ran fine but was a little high on Idle, about 200rpms more.I changed it that evening and it went back to normal.
I don't know what the difference would be if you left it on and your idle is fine. Really all it does is regulate air flow at idle anyways. (I think)

Yeah, the idle is exactly the same as before the swap. I think you're right about it's function. I had a good look at it while everything was apart and it just seems as though it acts as a bypass for the air at idle when the butterfly in the throttle body is totally closed. Also, it seems as though it has the ability to act as a choke in different weather/temperature conditions.

But then again I could be wrong. I have been before.......I think.  

[jwrape]

I reused the 2.5L housing. Is this going to cause a problem? It runs great right now. I just got back from about a 100 mile run with it on the highway and I really like the way it's performing.

Come to think of it I think I did that the first time I had it on as well. I beleive the housing is what has those security Torx screw, at which I didn't have a bit for the first time and left the other housing on anyways. Mine ran fine but was a little high on Idle, about 200rpms more.I changed it that evening and it went back to normal.
I don't know what the difference would be if you left it on and your idle is fine. Really all it does is regulate air flow at idle anyways. (I think)

Yeah, the idle is exactly the same as before the swap. I think you're right about it's function. I had a good look at it while everything was apart and it just seems as though it acts as a bypass for the air at idle when the butterfly in the throttle body is totally closed. Also, it seems as though it has the ability to act as a choke in different weather/temperature conditions.

But then again I could be wrong. I have been before.......I think.  

Yea, if that is the case then you might have trouble in the colder months.

[Jeffy]

I reused the 2.5L housing. Is this going to cause a problem? It runs great right now. I just got back from about a 100 mile run with it on the highway and I really like the way it's performing.

No.  To not have problems you want to swap the housing and the IAS motor.

[dexetr30]

Ok, so I did the right thing then? Like I said... I'm having no troubls with it at all. Started right up after I reconnectd the battery and came right into the perfect idle within a second or two. The swap itself was one of the easiest things I've ever done and the results are fantastic. I still may add the t.b. spacer and I'm thinking of gasket matching the t.b.

[jwrape]

Ok, so I did the right thing then? Like I said... I'm having no troubls with it at all. Started right up after I reconnectd the battery and came right into the perfect idle within a second or two. The swap itself was one of the easiest things I've ever done and the results are fantastic. I still may add the t.b. spacer and I'm thinking of gasket matching the t.b.

Gasket matching, actually a lot of folks including myself bore the TB out to 52mm. Bascially take the lip out of the center of it. I used a drememlt to bore mine but there are other ways. I think there is a how to on this site somewhere

[dexetr30]

Ok, so I did the right thing then? Like I said... I'm having no troubls with it at all. Started right up after I reconnectd the battery and came right into the perfect idle within a second or two. The swap itself was one of the easiest things I've ever done and the results are fantastic. I still may add the t.b. spacer and I'm thinking of gasket matching the t.b.

Gasket matching, actually a lot of folks including myself bore the TB out to 52mm. Bascially take the lip out of the center of it. I used a drememlt to bore mine but there are other ways. I think there is a how to on this site somewhere

Actually, my plan was to gasket match the intake manifold to the t.b.. I put the t.b. on today and noticed about a two mm difference between the t.b. itself and the manifold surface. Wouldn't be hard at all to open up a bit further with a die grinder and let some more air in. I'll just put a shop rag into the opening to catch all the debris and carefully grind a bit off. To make sure I don't let any aluminum debris get into the engine, I'll vacuum everything out thoroughly before puting the t.b. back on.

[jwrape]

Ok, so I did the right thing then? Like I said... I'm having no troubls with it at all. Started right up after I reconnectd the battery and came right into the perfect idle within a second or two. The swap itself was one of the easiest things I've ever done and the results are fantastic. I still may add the t.b. spacer and I'm thinking of gasket matching the t.b.

Gasket matching, actually a lot of folks including myself bore the TB out to 52mm. Bascially take the lip out of the center of it. I used a drememlt to bore mine but there are other ways. I think there is a how to on this site somewhere

Actually, my plan was to gasket match the intake manifold to the t.b.. I put the t.b. on today and noticed about a two mm difference between the t.b. itself and the manifold surface. Wouldn't be hard at all to open up a bit further with a die grinder and let some more air in. I'll just put a shop rag into the opening to catch all the debris and carefully grind a bit off. To make sure I don't let any aluminum debris get into the engine, I'll vacuum everything out thoroughly before puting the t.b. back on.

I did the same as well. Don't know if it made a difference. I figured since I had the TB off I might as well bore that bigger. I traced the gasket out on the manifold and the TB and went to grinding away with my Dremel. Went through a bunch of bits. Had to stuff a few rags in the manifold to cover it from shavings. :D It's big hole

[Jeffy]

It might be easier to get a 2" flapper sanding bit to clean up the hole once you use a grinder.  You want the least amount of turbulance.  The other option is to bevel the intake.  Some people stuff a rag into the intake then fill the rest with shaving cream to suspend the shavings in.