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I have a '90 with the carb'd 258 and wanting fuel injection. As it is, my motor has about 130,000 and is burning oil on start up. I don't want to go V-8 and am thinking of getting a used TJ motor and installing it. Has anyone else done this and is it very difficult to route the wiring and anything else I need to change besides the fuel pump in the tank? I know this is a newbie question, but I just don't want to jump into a headache. <IMG SRC="smilies/eek.gif" border="0">

TIA! <IMG SRC="smilies/usa.gif" border="0">
 

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I wouldnt really consider this a newbie question because swapping a TJ 4.0 is pretty involved as far as motor swaps go. You probably dont want to hear this but it will be cheaper to swap in a v8 (not considering axle swaps since you would have to do that). You need the engine, wiring harness, and computer to do it right. There's been a bunch of writeups on the net about this so finding one should be easy. Dont have time to find one right now but I will find one later.
 

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I've done it. I think it was worth all the time and money I put into it. I have an engine that is reliable and does not over power the axles. It was my second vehicle so I was in no hurry to finish. It took about 3 months and cost about $1300 including an AX-15 tranny. I looked for about a year before I bought a donor XJ cheap enough I could part out and offset the cost. What ever you figure it will cost, double it. I also had a large garage and the major tools available, like an engine lift and stuff. Also, the wiring is pretty involved. The bottom line is if you are even asking this question it will probably be too much for you. Here is a site with a 4.0l swap into a CJ. www.jeepland.net. Do a archeive search on other boards like JU.
 

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just swap in a v8 but dont waste money on the 258, I did and now I wish I had a v8 so I think Ill get one. <IMG SRC="smilies/biggrin.gif" border="0">
 

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There's a lot less custom fab work involved in swapping in the 4.0L, and IMHO it'll be a lot cheaper, ASSuming the engine costs the same.

Reason is, you can use all Jeep parts to make it work. Factory rad, factory motor mounts, factory bellhousing, clutch, fuel pump, etc etc etc.

Easiest way to get all this stuff in one place is to get your hands on a complete wrecked TJ (or better yet a late-model YJ), or arrange for a package deal for all the parts you'll need from one.

Chris

[ 10-25-2001: Message edited by: cwate ]
 

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I just purchased a 99 TJ Motor, Transmission, Trasfer Case and Gas Tank and I will be puting it in my 89 YJ. Do you guys know where there is a write up.

Thanks,
 

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There are plenty of writeups on this swap.

Hit google.com and you'll find some good ones.
 

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I have a 97 tj 4.0 mated to a 85 cj 999 auto tranny. this is in a 85 cj tub and frame..check out those articles. you need to decide what you want to do. auto/stick new components in the drive line etc..you will find the tj has more torque than the xj but less than the 258...I took out a 258 with jeep fuel injection in it. reason (lower miles and mated facotry fuel injection components) i love it....
Mike :smokin:
 

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I was wondering if it is possible to use the wiring harness that came with the new engine(mine is a 98 grand chero engine). Seems the nearly $500 hesco harness is a lot to spend. Also, can I retain the computer from the new engine as well, or does it have to be one that matched the smae kind of tranny? I want to put a TF 999 or 727 behind it, and the engine came from a chero with an auto, but Im not sure what kind. And does the TF have a place for the CPS? the several hundred dollar CPS kit from hesco or AA is also too much to spend for me:D
 

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To swap the 4.0 from a 258 is not that difficult I am doing it myself so... I picked up a 98 4.0L with 30,000 miles on it with wiring harness and computer for 700 bucks found it on the net.

The changes that have to be made is new Power steering pump out of a 98, and pick up a gas tank from a local yard from a 92 or newer YJ with EFI and thats all you need plus fifuring out the harness which I havent done yet, but if you were to get one with out harness and comp you can go Hesco or Painless I dont think the hesco harness is 500 bucks like you said I think they are cheaper check out jeepland.net he did the swap and says what he paid for shit.. As far as for tranny depends on what you want to do but with the new motor you are going to have to run a CPS sensor relocating kit Hesco makes one but it is expensive depended on the tranny you want to do AA makes Bell housing kits which have a CPS bracket on it already and there bell housing are nice.. For example I am doing the 4.0L in my 87 YJ and I went for a T-18 tranny with the low ass granny gear so I got a bell housing kit from Advance Adapters and it comes with everything you need bell housing external slave Cps sensor Bracket Boots Pilot bushing pretty complete but dont call them for this Kit cause they are a bunch of asspipes and they will say they dont make a kit for thet Tranny or even for some other tranny swaps and they will charge 500 bucks for there kit call my man Jack at No excuses Inc. 1-800-923-jeep and the kit will cost you $325.00 cheapest guy I know for AA stuff.
 

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Oh and one more thing to do this swap you are going to need:

Alot of beer, Tools, some weed,and a nice fat black chic to touch at night when your done!!! Take care dude and goodluck!!:beer:
 

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Well, If i get a newer TF-999 that was mated to a 4.0L, then it will already have a place for the crank Positioning sensor. AS for the tank, i heard it was possible to put a fuel sending unit from an MPI 4.0 (TJ) in to my 89 4 banger gas tank. Somehow they are supposed to work together. Then, I just need some EFI rated fuel lines and I think I should be good to go. Just wondered what kind of wiring I need to get the harness to work. Basically, I just want to run my ignition, speedo, tach, fuel guage and temp guage on a custom made dash that I want to fab. just wondering what it takes to rewire the rest of the vehicle and if I need to splice into the engine harness for anything.
 

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Jeepmangled87 said:
just swap in a v8 but dont waste money on the 258, I did and now I wish I had a v8 so I think Ill get one. <IMG SRC="smilies/biggrin.gif" border="0">
I'll second that. The 4.0l is fine, but for the hassle, I'd go with a
v-8. It isn't a cheap swap, but if done right, it is worth it.
 

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Why does everybody think the 4.0L swap is a hassle, Its an easy swap dude.. Dont know what makes it so hard. Now a v8 thats alot more involved. I am doing the swap right know its easy and fairly cheap once you have the engine that is...
 

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LOS-YJ said:
Why does everybody think the 4.0L swap is a hassle, Its an easy swap dude.. Dont know what makes it so hard. Now a v8 thats alot more involved. I am doing the swap right know its easy and fairly cheap once you have the engine that is...
I don't think it is any more or less a hassle than a v-8, just better results for the effort. A v-8 can be modified 7 ways from Sunday, and usually cheaper and easier than a 4.0l.
 

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Well thats depending on what you want dude... They are different swaps, and if you think the V8 swap is not a much more involved swap than a 4.0L swap, your smoking some better shit then me!!:rasta: :rasta: :smokin: :smokin:
 

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LOS-YJ said:
Well thats depending on what you want dude... They are different swaps, and if you think the V8 swap is not a much more involved swap than a 4.0L swap, your smoking some better shit then me!!:rasta: :rasta: :smokin: :smokin:


With the adapters and technical info available for a v-8 swap, I'd say it is as easy to do the swap from a mechanical point of view as it is to do a 4.0l swap. I have done the v-8, and helped do a 4.0l. For what you get in the end, the v-8 is more appealing to most guys. If you want 6 banger power, then do the 4.0l swap. Frankly, if I wanted a 4.0l, I'd sell what I had and buy a Jeep that had one in it originally. I think the 4.0l is a fine motor, but I wouldn't waste my time doing it because the results in my opinion aren't worth the money or the hassle. When it is all said and done, you still have a 6 banger. Just my opinion though. :)
 
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