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-   -   2.5 to 4.0 (http://www.wranglerforum.com/f218/2-5-to-4-0-a-251809.html)

maverick1979 06-26-2013 12:33 AM

2.5 to 4.0
 
Anyone know what wires I need to swap around to get this thing going

AllMudd 06-26-2013 07:55 AM

The whole 4.0 wiring harness and ECM to start.

maverick1979 06-26-2013 10:22 AM

Inside and out

Xpress 06-26-2013 10:29 AM

What year 2.5L?

AllMudd 06-26-2013 10:47 AM

Inside and out? You mean the gauges and all? Not sure on that one. But I know you will need either a new wiring harness and ECM or from the donor vehicle.

maverick1979 06-26-2013 10:50 AM

It's a 93 2.5 and I put a 95 4.0 in it. Tranny and transfer case as well

maverick1979 06-26-2013 11:26 AM

I have the 4.0 harness but it don't work wright will not turn over by key but can start it by jumping the relay 4x4 light is on and temp gauge don't work

Xpress 06-26-2013 05:05 PM

Since the 1993 YJ is already MPFI, according to most around the Jeep world you need only extend a few wires, wire in the 2 additional injectors, and fit the 4.0 computer and everything should theoretically work.

maverick1979 06-26-2013 05:56 PM

The big question is which wires

StanF 06-27-2013 08:12 AM

Quote:

Originally Posted by maverick1979 (Post 3902440)
The big question is which wires

Extend the wires only for the connectors that don't reach...

Look here for some good info/details:
Leans’ 4.0L swap is complete with pics!

maverick1979 06-27-2013 11:26 AM

Thanks that help a lot wish I would of hade this info when I started it has been a long two week of trying to figure out what the f I should do thanks a bunch

maverick1979 06-30-2013 03:59 PM

Got it done runs f ing great. Easy to do as we'll and I'm not good with wiring stuff up. Weeeeeeeee

maverick1979 06-30-2013 08:45 PM

Quote:

Originally Posted by Xpress (Post 3902315)
Since the 1993 YJ is already MPFI, according to most around the Jeep world you need only extend a few wires, wire in the 2 additional injectors, and fit the 4.0 computer and everything should theoretically work.

Yes it works. It took about two hour to do took my time

maverick1979 07-01-2013 01:08 PM

Getting new drive shafts made can't wait to get them


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