4.0L H.O. swap from '91 XJ to 87 MJ

[kazam]

  Greetings, 

 

I decided this morning that I have to make some more space, so the ' 91 XJ is going to go to somewhere;

the motor is going to replace the struggling I-4 in my  '87 Comanche.

 

I am wondering what work I have to do to get that done.

I am wondering what all I have to transfer, and I might appreciate some specifics that would help.

 

I figure I will transfer the engine and accessories from the (XJ), and that would include the:

 

wiring harness,

 

ECU,

 

what else ?

 

Thanks very much.

 

 

[trapperbb]

I'm not sure on the i 4 but i just swapped my blown renix 4.0 for the ho 4.0 (got a good deal on 4WD donor) and it wasnt that bad but i had to swap just about every harness from one truck to the other. as well as what ever they plugged into lol.

[Mattwheels]

You'll have to make a custom harness to connect the HO front harness to the MJ rear harness, Its actually super easy.

[88ComancheMitch]

I have a 88 truck, with a 98 motor. You can use renix wiring. Just have to use renix sensors. I'm learning, but I have a couple more sensor (temperature sensors) to hook up and I should have everything together. Truck runs great, once I got my vacuum leak fixed. I even put a 99+ intake manifold on it.