Doin 4.0L swap. Got a few Questions

[BIIHawg]

So I have dropped a 4.0L into my B2. I have started putting the wiring harness in and just have a couple questions:

1) Is the o2 sensor the same on the 2.9L and 4.0L? Can I just plug in the o2 sensor that is already attached to my exhaust or is there a 4.0L specific one?


2) What the hell is this supposed to plug into? Its pretty big and thus I assume important. It is on the passenger side of the motor.

Any help is much appreciated.

 

[Hahnsb2]

That plug plugs into a ingition control module I think, it's mounted on the core support on the passenger side of the rad on the doner vehicle. Can't answer your O2 sensor question, the 4.0 I'm using has 2...

 

[CJREX]

More than likely, you will need a new O2 sensor.

When I did my swap, my '89 2.9 used a 3-wire O2 and the '91 4.0 used a 4-wire.

Luckily the 4.0 Y-pipe I had bought had 2 sensors in it.

 

[abrush]

^^^^ That is correct. I did the swap as well and had to use the O2 sensors from the donor vehicle because of the different number of wires going to the sensor. I used the y-pipe from the donor vehicle (Explorer) because of the two sensors. And yes, that plug is from the ignition module if I remember correctly.

 

[BIIHawg]

So I bought a new o2 sensor and it has 4 wires on it, but the plug in my wiring harness only has 2. Is there different styles? What years did you guys use for the swap? My harness is from a 91 ranger.

 

[Explorin94]

That is the connector for the EDIS Module. Should mount in front of the battery.

 

[BIIHawg]

Figured out my o2 sensor. I was lookin at the wrong plug. Just one of those things you do when you get too excited about a new motor.