4.0 head on a 4.2 help
 

I have a 1989 YJ that I am doing a EFI swap out of a 1990 cherekee. Replacing the 4.2 head with a 4.0 with all the wiring from the cherekee. Need help with the wiring. Would like to know what to keep and what to throw away. I don't want to throw away something I am going to need later and have to start all over. It would be a bonus if I can skip the mistake I know I would make without the help. Thanks to anyone who can help me

Re: 4.0 head on a 4.2 help
 

I have read that the big thing with the swap is the cpu. Cane I just modify the DAMPER on the motor , I did a google for the 4.0 crank damper for the cpu re-locater wow that mouch. But the while thing with this build is on the cheep. I have a mill so cane I just put the slots in the stock damper. Just need some good measurements. If some one has one that they modify or ordered and would Give me the measurements and it work with renex on my jeep I will share the finding and pics. Thank HEEPJEEP!!
:confused:

Re: 4.0 head on a 4.2 help
 

swamper has a complete 4.0L wiring and CPU out of and XJmaybe he could send ya pics

Re: 4.0 head on a 4.2 help
 

Thank scooby I will pm him.