4.0 swap q's

RayRayBaby1990 · Aug 24, 2010

Ok me and my wife are tackling the infamous 4.0 swap. We got a 92 4.0 out of a Explorer. I have been studying all the info I can find online about the swap. From what I have gathered If I use a 1990-1992 Ranger Harness I won't have to splice anything it's just plug and play?? And for the 4 wires you would have to splice for the heater controls all you have to do is swap the blower resistor and it will plug right in ?? I'm trying to do this swap with as little wiring as possible. Please help !!! I'm currently trying to locate a harness and ECU, which for some reason is rather hard around here (delaware). Right now I'm tearing into the motor, I'm going to do a compete gasket kit and paint the motor, and was going to play with wiring it in the mean while. If anyone can help me I would appriciate it.

kunar · Aug 24, 2010

whats the vehicle you're working on?

country0001 · Aug 24, 2010

The tech library is very detailed about this. Thats the main thing I used on my swap.

RayRayBaby1990 · Aug 24, 2010

I have read on the tech section but im double checking myself....its a 1990 bronco ll. So do i have it right in my first post?? Cause i know there are variations....but if i use a 1990 or 1991 ranger harness than it should plug right into the bwp right?? And than i could wire my lights into the new bwp?? Sorry read so much info today im starting to oget overwhelmed. Sorry for being such a noob but i really want gto get this right the first time.

country0001 · Aug 25, 2010

Apparently they changed the harness every year. Mine came from a 94 ranger. I took the entire harness,and the only thing that was spliced was the taillight harness. Every swap is different.

I still have some issues with blinkers, and stuff, some were there when I got the truck and just compounded as I added the new stuff.

Looking back, it wasn;t that bad. During the swap, I cussed a lot. Its recommended that you have the donor vehicle there, while ur doing the swap, so u can go back and forth. You will do a lot of that. Also its handy when u forgot something that u need.

Accelerator cables are diff, does ur donor vehicle have elec shift 4wd, what about power windows, if ur going that route. Don't forget about the inertia switch.

Plus a million other things.

Its well worth the time and effort. I will be doing this in my other B2 as soon as I can find and afford a suitable donor vehicle.

country0001 · Aug 25, 2010

Get a haynes or chiltons manual too. They come in real handy. One for the B2/ranger will work as long as u stay below 92. If u get an explorer harness, u will need an explorer manual.

multiranger · Aug 25, 2010

RayRayBaby1990 said:
Ok me and my wife are tackling the infamous 4.0 swap. We got a 92 4.0 out of a Explorer. I have been studying all the info I can find online about the swap. From what I have gathered If I use a 1990-1992 Ranger Harness I won't have to splice anything it's just plug and play?? And for the 4 wires you would have to splice for the heater controls all you have to do is swap the blower resistor and it will plug right in ?? I'm trying to do this swap with as little wiring as possible. Please help !!! I'm currently trying to locate a harness and ECU, which for some reason is rather hard around here (delaware). Right now I'm tearing into the motor, I'm going to do a compete gasket kit and paint the motor, and was going to play with wiring it in the mean while. If anyone can help me I would appriciate it.

You need a 92 wiring harness.. the dash wiring is the only wiring that is plug and play... Even the wiring for the light switch when you open the doors will need to be changed... So unless the harness is with the dash... use a 92 harness.. I have done two 4.0 swaps and this applied for both...

RayRayBaby1990 · Aug 26, 2010

Ok well i guess i fudged up....i grabbed a harness out of a 1994 xploder....though it didnt have the cam syncro. I plugged it in tonight....im going to need to splice the tails.....i have interior power....aside from power windows and locks.....and that was just off plugging it in.....but my switched power isnt working. Also my instrument lights are staying on constant. Going to get the wiring diagrams tomorrow. I just thought i would try plugging it in and see what happened....just playin around right now while the motor is being overhauled.....didnt want to throw junk in it....and than pull it 2 months from now

kunar · Aug 26, 2010

2nd gen truck, 2nd gen engine. you are already set up for the easiest 4.0 swap possible. use a 90-92 ranger wiring harness and it will be plug and play.

if you cant find that harness, it can still be done. it wont be nearly as easy though....

RayRayBaby1990 · Aug 26, 2010

I was looking for a 90~92. Harness from a ranger......seems to be impossible around here though.....of course i only paid 30 for this one and the ecu......so maybe ill look around some more. Im in delaware....so if i have to drive to md or va to get one it will still be ok.....if anyone on here is from around my area and knows where there is one let me know ill go get it im wanting this swap to go as easy as possible. Its the wifes truck and she is getting antsy to drive her baby again

kunar · Aug 26, 2010

RayRayBaby1990 said:
I was looking for a 90~92. Harness from a ranger......seems to be impossible around here though.....of course i only paid 30 for this one and the ecu......so maybe ill look around some more. Im in delaware....so if i have to drive to md or va to get one it will still be ok.....if anyone on here is from around my area and knows where there is one let me know ill go get it im wanting this swap to go as easy as possible. Its the wifes truck and she is getting antsy to drive her baby again

you'll want to use the computer that came with the engine. i think after 92, they did the fuel injection differently.

RayRayBaby1990 · Aug 26, 2010

ECU didn't come with engine....did I screw up all the way around ??

RayRayBaby1990 · Aug 26, 2010

shoot I was wishing they had the ecu and harness there when I grabbed the motor, but no luck. the 94 exploder harness and ecu were all I could find. Wish I could find a 90-92 ranger harness so I could just plug play and drive.....maybe the good man upstairs will shine down. It could be worse though....I was about to jump on a 95 until I found out the difference LMAO

kunar · Aug 26, 2010

hmmm... i think if you use the newer injectors you should be okay. i used a newer engine with older injectors and computer....

country0001 · Aug 27, 2010

Contact AllenD and he might be able to hook u up with what u need.

4.0 swap q's

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