4.0

[xtreameracer]

first of i have a 88 2.9 ranger, i have been looking at the 4.0 upgrade , what i have read so far is i have to use the computer and wirring out of a gen 2 with the 4.0 . can some one tell me why this has to be done. i have searched all over the fourm and i found no fact on why.

 

[BlackBII]

Because a 4.0 cannot run with a 2.9 computer and harness. If it could, then swapping them wouldn't be required. Makes sense don't it?

You could give it a shot, but your 2.9 computer will be wondering where the hell it's ditributor went, and what the hell this MAF sensor thing is.

 

[xtreameracer]

i found a post where someone said that the 2.9 distribitor might work in the 4.0

 

[spencer]

You can believe them if you want to.... but changing the harness isnt really that bad, just take good notes and mark everything you can.

 

[xtreameracer]

I think it's been stated that the oil pump drives differ, and that the intake manifold would get into the way. Best bet is to swap computer and mainharness, that way the engine management matches the engine that's in your truck.

Pete

that sucks, i would still rather find out for sure. mabe someone why has tried it can chime in here.

 

[Original_Ranger84]

If someone has it was probably a PITA to wire up and really doesn't justify just geting the harness and computer out of a gen 2. Why do you wanna use the 2.9L harness soooooo bad?

 

[xtreameracer]

becouse i dont have a harness, and there is nothing wrong with the 2.9 computer.

 

[Original_Ranger84]

But it would be just as easy to go to a junkyard to get a harness and a computer and save you alot of pain.

 

[creepinjeepster]

Besides the fact that the end connectors on the 4.0 harness aren't the same as on the 2.9 so you'd have to change all of them too just to plug in stuff like, I don't know, EVERY sensor on the motor.