the grand chrokee has a security system that will cause you problems find a chrokee cpu. I did the swap in my cj, and used a 92 chrokee that I got for a hundred bucks. rebuilt the motor ysed the 5 wire to fire method of wiring. best thing i ever did.
Well... my 258 has a lower end knock and serious blow by. Thats the main reason for the swap. Should I just rebuild and install a 4.0 head?
thats what i would do, but its up to you. a lot of guys would just drop the whole 4.0 in. theyre cheap and plentiful and you could find a used one that still has a lot of life left in it. if you want "brand new" though rebuild either one. i guess its just a matter of how much money you wanna spend.
some may call it overbuilt. my right foot calls it future scrap.
Okay..... So decided to rebuild and do the 4.0 head conversion. I read that I will have to close off (2) water holes using hi-temp epoxy, Is this true? And do I need a 4.0 intake and exaust manifold? If so will my carburator bolt up?
So I went ahead and rebuilt my 4.2 and put a 4.0 head on from a 00 GC. Ending result was amazing! Even though it has NOT broke in I see a big change in power. The 4.2 intake did work as well as the 4.2 exaust manifold. But it wasnt easy. I had to make a couple modifications in order for it to work. Grinding a couple corners, utilizing oversized washers and making my own gasket. Also learned that my yj has also been "nutterd". I had never heard of that till now. So now I want to take off all the emissions stuff that is on there. I feel that all those vacuum lines are not needed since it has been nutterd. Does anyone know if i can just remove everything and plug off lines or do I need to make some changes in order to do so?
From what I hear they are solid trannies. I have seen a couple TJs with them.
I have been looking for info everywhere for this mpi swap. I found kits and everything else. I have not found anything on using the mpi from another vehicle. I want to get going with this project. Help please!!!!
Its really easy just google jeep 5 wires to fire, should find all the info you will need. I did a 4.0 swap in my 79 cj took me the better part of a day. But it was the best thing I ever did for the old girl.