4.0 swap into "87" 2.9 broncoII

[bronco jim]

does anybody have the wiring diagram for this swap? I have the write up that Bronc did on the Ranger Station, the "94" Exp. wires are the same but the BroncoII wires are not the same all my plugs on the driver side are all gray. I can't find the big white HH plug. After you put the power box in the Bronco from the Exp. on the passenger side next to the battery what do you do with all the wires that go around the front of the Bronco? Hope someone can help!!!

 

[Rangermilitia]

run with it

Run em to the driver side. I think bronc had crack b4 he wrote that up. All the wires hook up at the driverside

 

[sjfreddy]

Lookin into this myself. i do know that your 87 and my 88 do not have the white plug that goes into the fire wall. 89 would be the first year for that. best of luck !!!

 

[AllanD]

Honestly you need to "split" both harnesses and use some wires from the late harness
(engine management and power distribution) and some wires from the earlier harness
(lights horn etc)

It's a complex job and takes patience and time.

what I did putting a 1993 4.0 and wiring into my '87 Ranger was to confine all my splicing to the drivers side inner fender.

You CANNOT use the "big white plug" any more than you
SHOULD try to swallow the big white mint you find in a urinal.

essentially what I did was to cut the connectors off the 2.9 harness
and splice them to the wires from the big white connector so I could
make the 4.0 harness connect to my dash.

IT's really the only way.

You NEED the EVTM manual for BOTH the 1994 Explorer donor
and for a 1987 Ranger (available on ebay) or you might aw well pack it in now.

I'm a friggin artist on wiring stuff and that particular job took me
almost three weeks to do it RIGHT, tedious, detailed and checking
everything several times, both by the manuals, "beeping" it with a
continuity tester and frequent comparisons to a pair of UNMODIFIED
SPARE harnesses from an '87 2.9 and another 1994 Explorer harness.

I musta done it exactly right because whe it was all together
I had only two problems... a loose ground wire next to the PCM
in the passenger side kick panel that prevented the fuel pump relay
from switching on and an iaaue with the A/C-WOT relay that I haven't bothered to fix.

the problem with the relay is that if youeither use WOT, or crank the engine
with the A/C switch in the on position the relay trips and you don't get A/C
until you either cycle the ignition key to OFF or pull the relay from the socket
and re-insert it.

I've been driving the truck with a jumper wire in place of the WOT-Cutout relay.



AD

 

[rayfink]

look when i did my swap from 91 explorer to 86 bronco i swaped in everything and i mean everything even the useless white box on the drivers side. By swaping in the dash from the explorer witch fit great and all the other harnesses all i had to do was swap over and plug in all the conectors. That eliminates all that wire tracing and splicing BS that might come apart on you later down the road. So swaping everything over from the explorer even the dash is really the easiest way to go and it won't take you no three weeks to do it eather. Everything worked on my bronco the first time i fired it up except for those crapy gauges