4.0 fuel injection on a 4.2

[Zoro]

I have a 4.2 I6 and I am swapping a 4.0 head(#7120) onto the block. Besides the manifolds, what all do I need to yank from a parts XJ to make the fuel injection system work reliably on a 4.2 engine? Which system will work better as a stand alone system, the RENIX or the '91-'96 system? Should I source an automatic or standard parts XJ?

The transmission I wil be using is the T176, if I remember correctly there is a hole on the XJ bellhousing for the CPS sensor. I will most likely use one of the aftermarket crank mounted sensors in place of it. I've been told it will work.

Thanks for the help!

 

[Johnnie Walker]

Renix will work better.

 

[Zoro]

Renix will work better.

Ok, can the newer 7120 head be used with the Renix style injection?

 

[87manche]

Ok, can the newer 7120 head be used with the Renix style injection?

yes, you'll simply have to adapt the TPS to the HO throttle body. It's been done, search the modified tech.

 

[BlueCuda]

And if your lazy I think hesco makes an adaptor to run the renix TPS on the HO throttle body.

 

[87manche]

And if your lazy I think hesco makes an adaptor to run the renix TPS on the HO throttle body.

it's big bucks, you can accomplish the same thing with about 5 dollars worth of hardware store randomness and a dremel.