Looking For 88 4L Swap To 91 4L Ho Thread

[missbehavin]

Hey everyone, I am new on here but not new to the jeep world. I already rebuilt an XJ from the floor up. This time I found a great shape MJ just bad engine, so I am doing a HO swap from a junk bodied MJ to the 88 good bodied along with a lift build.

 

I took all dash and harness etc from the donor MJ.

 

Anyhow I was told by someone I met by passing a couple months ago about this site and he told me to join. He said there was once a thread on here with something similar to the engine swap I am doing. I am not sure I will need it, but it would be nice to find it if I do. I have searched but can not seem to find it anywhere.

 

Can anyone help me please?

 

Thanks

 

Tracey :D

[MJRemi]

This one from Alexia can get you started but you may want to scroll through the 'Project MJs' threads to find some more. http://comancheclub.com/topic/32740-alexias-1987-to-1997-comanche/

[cruiser54]

There's an easy way and a hard way to do this. If you're hell-bent on using all the late model electricals, that's the hard way. Here's the easy way.

 

The Ho isn't magic by any means in comparison to the Renix. 8 more horsepower at the top end of the RPM range and no more torque than a REnix.

 

 

 

 

Cruiser’s HO into Renix Swap

 

This swap is easier than some will lead you to believe, generally those who have never done it. Those of us who have done it, like myself, will share with you the things that need to be done for a successful swap. Just think of it as swapping in a long block.

 

The HO and Renix have some differences but none that can’t be overcome very easily.

 

Any HO engine from an XJ or ZJ through 1998 can be used. One running change was that the rear of the head was no longer drilled and tapped for the temperature gauge sender beginning in the 96 model year. The sender can be relocated to the threaded hole in the thermostat housing taken from the HO engine. You’ll have to extend the wire to that location. Some brave souls even drill and tap the HO head for the sender.

 

You will be using the intake and exhaust manifolds from your Renix, along with all your sensors and wiring. Since the intake ports of the HO are slightly different, you use the Renix gasket. Exhaust ports are identical.

 

You will need to use your Renix distributor as it is different than the HO because they use different fuel management systems. The flywheel or flexplate from the Renix must be used so your CPS gets the correct signals. The valve cover from the Renix allows you to keep your CCV system intact and requires no modifications.

 

The HO block will have a plug in the coolant galley on the driver’s side of the block, closest to the front, which needs to be removed so your Coolant Temp Sensor can be installed in it’s place just as it is on the Renix. It requires a 5/16" square drive or a modified 3/8" drive that has been ground down to fit. Do this before installing the engine.

 

As for the knock sensor, which is located just above the oil pan on the driver’s side of the engine about mid way, all the blocks I’ve seen are threaded for it. If not, I’ve heard they may be drilled but not tapped. Tap the hole if that’s the case.

 

　

 

Revised 07/24/2012

 

　

[missbehavin]

There's an easy way and a hard way to do this. If you're hell-bent on using all the late model electricals, that's the hard way. Here's the easy way.

 

The Ho isn't magic by any means in comparison to the Renix. 8 more horsepower at the top end of the RPM range and no more torque than a REnix.

 

 

 

 

Cruiser’s HO into Renix Swap

 

This swap is easier than some will lead you to believe, generally those who have never done it. Those of us who have done it, like myself, will share with you the things that need to be done for a successful swap. Just think of it as swapping in a long block.

 

The HO and Renix have some differences but none that can’t be overcome very easily.

 

Any HO engine from an XJ or ZJ through 1998 can be used. One running change was that the rear of the head was no longer drilled and tapped for the temperature gauge sender beginning in the 96 model year. The sender can be relocated to the threaded hole in the thermostat housing taken from the HO engine. You’ll have to extend the wire to that location. Some brave souls even drill and tap the HO head for the sender.

 

You will be using the intake and exhaust manifolds from your Renix, along with all your sensors and wiring. Since the intake ports of the HO are slightly different, you use the Renix gasket. Exhaust ports are identical.

 

You will need to use your Renix distributor as it is different than the HO because they use different fuel management systems. The flywheel or flexplate from the Renix must be used so your CPS gets the correct signals. The valve cover from the Renix allows you to keep your CCV system intact and requires no modifications.

 

The HO block will have a plug in the coolant galley on the driver’s side of the block, closest to the front, which needs to be removed so your Coolant Temp Sensor can be installed in it’s place just as it is on the Renix. It requires a 5/16" square drive or a modified 3/8" drive that has been ground down to fit. Do this before installing the engine.

 

As for the knock sensor, which is located just above the oil pan on the driver’s side of the engine about mid way, all the blocks I’ve seen are threaded for it. If not, I’ve heard they may be drilled but not tapped. Tap the hole if that’s the case.

 

　

 

Revised 07/24/2012

 

　

 

So in this information you are talking about a 96 or newer engine?

 

I am using a HO from another MJ (91), i took all dash and steering from it aas well, so everything should be plug and play as what I have been told, as well some things that were on the renix, that were left on the truck i am using can just be left because the new HO has different set up using the computer, more electrical run components like the speedometer for example.

 

Thanks for your info, I am just confused if you are saying all of the stuff with the temp gauge is for what I am doing, because i also don't believe i have to use the old manifolds....

 

anyhow thanks again :thumbsup:

[missbehavin]

This one from Alexia can get you started but you may want to scroll through the 'Project MJs' threads to find some more. http://comancheclub....-1997-comanche/

 

Thanks I have read through this one its pretty different from what I am doing. Perhaps the thread was very old and why i can't find it or the guy i was talking to is loosing his mind lol

 

I was just hoping to find something incase its needed. I am gonna install the other engine possibly this weekend i already have the dash and steering pretty much in and connected, and the renix has all been taken out. will see what happens soon :D

[neohic]

The site you might be looking for is this one: http://comancheclub.com/topic/4559-wrenches-gone-wild/

 

This truck started life as a 2.5 and was swapped over to a 4.0 using a 4.0 donor XJ. He used a Renix era XJ, but the idea would still be the same that you'd need to remove all of your original wiring and move each piece of the harness over from your donor. Now, it isn't totally necessary to swap everything over to make a 4.0 HO run in a Renix setup... but you won't have all of the benefits of the HO system.

 

If I were to do it, I'd park both vehicles next to each other, remove everything from the original vehicle, and just move one piece at a time. It everything is set in place and hooked up the way it was in the donor, you should be fine.

[mnkyboy]

Sounds like a pretty straight forward swap since your using another MJ for a donor.

Just swap everything over from one body to the other.

 

What Cruiser is talking about is if you wanted to keep the entire renix system but use an HO engine, but since you have everything you might as well swap it all over to the HO stuff.

 

 

 

[missbehavin]

The site you might be looking for is this one: http://comancheclub....ches-gone-wild/

 

This truck started life as a 2.5 and was swapped over to a 4.0 using a 4.0 donor XJ. He used a Renix era XJ, but the idea would still be the same that you'd need to remove all of your original wiring and move each piece of the harness over from your donor. Now, it isn't totally necessary to swap everything over to make a 4.0 HO run in a Renix setup... but you won't have all of the benefits of the HO system.

 

If I were to do it, I'd park both vehicles next to each other, remove everything from the original vehicle, and just move one piece at a time. It everything is set in place and hooked up the way it was in the donor, you should be fine.

 

wicked!!!!!!!!!!! that is exactly what i am looking for!!! thank you soooo much :D

 

 

 

 

 

 

Sounds like a pretty straight forward swap since your using another MJ for a donor.

Just swap everything over from one body to the other.

 

What Cruiser is talking about is if you wanted to keep the entire renix system but use an HO engine, but since you have everything you might as well swap it all over to the HO stuff.

 

 

I agree thats what I am figuring although tehre is a few connectors on the good MJ that are lingering that the HO doesnt have connectors for but I am going to assume for now are not neccessary because the HO will have different connections and run through the computer.

 

We will see lol

 

:D

 

Thanks!!