mj -yj renix info

[1989mjutah]

Hey i have a 89 comanche the body and chassis was breaking apart as well as other mainframe problems so i tookthe i6 with the ax-15 and tcase out and am going to put it into my 94 wrangler (I4)  and i need to know what to do with swapping over the renix system 

 

and the wrangler fourms give no real helpful info I'm aware this is not the wrangler page but into would be nice just need to know everything about the renix system to run

[The86manche]

The biggest thing to my understanding is that you will need to relocate the motor mounts on the frame side.

[The86manche]

As far as wiring and such though that would be difficult I think because the renix ecu is located under the dash and the yj ecu is on the exterior firewall.

The yj and mj/xj harness is very different..

[ghetdjc320]

You’re talking about running your Renix MJ 4.0 in a 94 YJ correct? As far as the electronics are concerned you might as well swap to obd1 as the YJ never had Renix (they had a carbed 4.2 from 87-90. 91 switched to obd1/4.0HO.

[eaglescout526]

1 hour ago, ghetdjc320 said:

YJ never had Renix

 2.5L from 87-90 TBI. Granted its not the 4.0L Renix but it still had Renix for a bit. 

[ghetdjc320]

18 minutes ago, eaglescout526 said:

 2.5L from 87-90 TBI. Granted its not the 4.0L Renix but it still had Renix for a bit. 

Of course it did lol. I forgot the 2.5 was in the YJ in those years. 

[eaglescout526]

8 minutes ago, ghetdjc320 said:

Of course it did lol. I forgot the 2.5 was in the YJ in those years. 

Yup! lots of folks forget, but thats also where I can seem to find alot of 2.5L TBI testing info funny enough.

[Pete M]

more or less nothing is in the same place between the YJ and MJ and so you'll be inventing as you go.   

[ghetdjc320]

26 minutes ago, eaglescout526 said:

Yup! lots of folks forget, but thats also where I can seem to find alot of 2.5L TBI testing info funny enough.

Thanks for the clarification, I edited my post to prevent confusion 

[pizzaman09]

Like most engine management systems, it's all about just having the right sensors in the right places.  The engine harness is still going to be engine bay shaped.  I'd grab it all and swap it over.  Drill a few holes in the firewall to send the wires through and hook it up.  You basically already have the full package, the mechanical connections and ancillary packaging are probably going to be the main hurdles.  You can certainly look at the six cylinder YJs for inspiration for a lot of it.

The connectors on the Renix ECU don't look very waterproof to me so if you mount it under the hood, consider the weatherproofness.

[1989mjutah]

20 hours ago, The86manche said:

The biggest thing to my understanding is that you will need to relocate the motor mounts on the frame side.

thats the easy part i have the mounts and a buddy that will weld them my only concern is how to fire the i6

[Pete M]

1 hour ago, 1989mjutah said:

thats the easy part i have the mounts and a buddy that will weld them my only concern is how to fire the i6

 

bring over all of the wiring and make it fit... somewhere.  plus fuel pump stuff.  you'll either need to integrate it all with the current body wiring, or pare it back to make it a stand alone control system. 

[Ωhm]

1 hour ago, 1989mjutah said:

my only concern is how to fire the i6

 

33 minutes ago, Pete M said:

make it fit

 

You all ready have everything you need.

[Pete M]

bonus points if you run all new wiring and just reused the connectors!   

[1989mjutah]

18 hours ago, Pete M said:

 

bring over all of the wiring and make it fit... somewhere.  plus fuel pump stuff.  you'll either need to integrate it all with the current body wiring, or pare it back to make it a stand alone control system. 

i want the standalone system any tips also i don't wanna butcher the mj just in case someone else swappes a xj moter into it cause its gonna be sold 

so could i buy an 89 xj harness and run it? if so what exactly should i buy to run it