Topic: wire harness and computer question

[bammerman]

I see that the 4.0 wasn't introduced until 1991.  I have a rebuilt 1988 but want to plug and play instead of using the 88 wire harness and computer.  
is there a wire loom from block with computer to run the 6 cyl with the renix injector system?  Is it possible to get a wire harness that will work without having to rewire everything with the 88 harness?  Maybe use a 4.2 harness to run the renix injectors?  Any ideas or advice is appreciated.


can we use the same fuse box and guages?  can we hook a 6 to a 4 fuse block

[sharpxmen]

I see that the 4.0 wasn't introduced until 1991.  I have a rebuilt 1988 but want to plug and play instead of using the 88 wire harness and computer.  
is there a wire loom from block with computer to run the 6 cyl with the renix injector system?  Is it possible to get a wire harness that will work without having to rewire everything with the 88 harness?  Maybe use a 4.2 harness to run the renix injectors?  Any ideas or advice is appreciated.


can we use the same fuse box and guages?  can we hook a 6 to a 4 fuse block

you can install the distributor, wire harness, crank sensor, map sensor, AIT, coolant temp sensor and PCM from a 4.0 6 cylinder and run it that way (add injectors to that list too). not sure about the fuse box, if your's is a 91+ then you should be able to connect the engine bay harness of a 4.0 to your in-cab harness. I'm not sure if the flywheel crank teeth are the same, i think there are 3 groups of 4 equally spaced (120 deg) on the 4.0 flywheel (91-95)

[Torch_Ind]

correct me if I'm wrong but the 4.2L was carb no?

also the renix isn't at all the same wiring as the 4.0L

your going to have to cut and past i think

[bammerman]

Mine is a 90 yj and the donor is a 88 xj

blown 2.5 going to 4.0 (not the 4.2)

[Torch_Ind]

Mine is a 90 yj and the donor is a 88 xj

blown 2.5 going to 4.0 (not the 4.2)

ya you asked if you could use a 4.2L harness I think there carb.

is your 90yj multiport or even tbi?

does the 88xj have a donor trans to? because I don't think the trans will bolt up to the 4.0l if your swapping just the eng

[bammerman]

TBI

I have a newly built 4.0, Ax15, and NP231 J

[bammerman]

I am mainly just wondering what harness I can get that will work with my existing fuse block.  I not worried about price.  Just only have 4 days to finish this project before I move to Denver.  Not really wanting to rewire the XJ computer and harness to what I have now.

[Torch_Ind]

holy crap dude you expect to swap the eng and completely wire it up in 4 days?   good luck with that.

my buddy did a complete swap going from a 95 yj 2.5L to a 4.0L with a 95 yj donor vehicle "everything complete. and if I remember correctly the fire wall pin out was different and he swapped all harnesses and fuse boxes and all under hood to make it all work. also the tach needs to be the 6cylinder one or it will read wrong.  It's not just as plug and play as it should be. esp being tbi I have no idea how that would work going to a 4.0L multi port renix witch I don't think was ever offered in a yj


anything is possible but 4 days it very short time line to get this swap done.

[bammerman]

We are mocking up mounts today.  Dry fitting drive train as well.  Our problem is the wiring.  That is what we are running into.  Got a XJ wiring diagram just cant find a 90 YJ one that will print out ok.

[Torch_Ind]

We are mocking up mounts today.  Dry fitting drive train as well.  Our problem is the wiring.  That is what we are running into.  Got a XJ wiring diagram just cant find a 90 YJ one that will print out ok.

good luck to ya. not sure were you would get tbi wiring diagrams.. You may have to use a test light and meter

[aw12345]

Use the later 4.0 and a painless wiring harness and standalone pcm will make wiring simple

[97 TJ - I dont wave]

www.hotwireauto.com

Call Tony...

[Torch_Ind]

http://www.summitracing.com/parts/PRF-10111/

is this the painless your talking about?? if so the price made pains in my chest lol

[Bounty Hunter]

There is no simply plug and play harness from another vehicle, it's gonna have to be a custom job either by you or a vendor.

By far the simplest thing to do, and more bang for your buck, would be to find a GM v8 with a carb, auto, and 231c.

[sharpxmen]

There is no simply plug and play harness from another vehicle, it's gonna have to be a custom job either by you or a vendor.

By far the simplest thing to do, and more bang for your buck, would be to find a GM v8 with a carb, auto, and 231c.

he already bought the engine and transmission http://4bangerjp.com/forums/index.php/topic,8146.msg64713.html#msg64713

at this point the cheapest and fastest way to go is to mate the XJ harness he has to his YJ and hope it fires up.

or imo better get a YJ 91-95 full harness, PCM, intake manifold with throttle body and some of the engine accessories (distributor, flywheel if it's different and the PCM coolant temp sensor)