My 3FE into FJ40 swap

[Curtice]

The 3fe ecu uses the Park/Neutral switch as an input. Most if not all of us with M/T just connect these wires together in the ECU harness so it thinks it is always in park.

Thanks for the tip. I will probably do that.

 

[Curtice]

Previous 3FE conversions...how did you handle the exhaust pipes? The 2F only has one pipe coming out of the manifold. It splits into 2 pipes, before converging again right before the catalytic converter:

The 3FE has two pipes coming out of the manifold, with 2 cats. On the 62, they converged well underneath the vehicle with a y pipe near the muffler:

Along with the engine, I got the 2 downpipes with cats, but did not get the "Y" pipe.

What is the best (read cheapest) option? Get the y pipe from the 62, and converge the 62 down pipes (without cats) prior to my cat? How will it fit? Can I use my existing down pipes somehow? Should I remove my cat, and use the 2 with the 62 pipes? It looks like this is going to require some customization at the exhaust shop no matter what...

 

[Tigerstripe40]

For emissions, does your truck need a catalytic converter?
How many O2 sensors does the 3FE expect input from?

 

[Curtice]

For emissions, does your truck need a catalytic converter?
How many O2 sensors does the 3FE expect input from?

I am not desmogged, but in my state, a vehicle this old is not required to pass emissions. I believe the ECU expects input from O2 sensors in both downpipes. That is a good point...need to use the 62 downpipes for sure, because of that.

 

[Tigerstripe40]

I am not desmogged, but in my state, a vehicle this old is not required to pass emissions. I believe the ECU expects input from O2 sensors in both downpipes. That is a good point...need to use the 62 downpipes for sure, because of that.

I was wondering if there is a pre-cat o2 sensor and a post-cat o2 sensor. If so, eek. If the 3FE isn't expecting that, you might consider just eliminating the cat altogether.

 

[Curtice]

I was wondering if there is a pre-cat o2 sensor and a post-cat o2 sensor. If so, eek. If the 3FE isn't expecting that, you might consider just eliminating the cat altogether.

As far as I know, both sensors are pre-cat (can see them on the pic above). I am fine either way, but still need to figure out how to mate the fj62 downpipes. I need them to converge somehow.

 

[lelandEOD]

There's no pre/post cat O2 sensor. The ECU adjusts the mixture by looking at the two O2 sensors and treats the straight 6 engine like two 3 cylinder engines: the front 3 and the rear 3.

So, you definitely need two O2 sensors, but there's no need for 2 cats unless you have to keep it for smog reasons.

I made my own exhaust for my 3FE swap by bending two down pipes that merged into a Y Pipe. I bought all my parts from Summit Racing and just welded the O2 bungs to the down pipes.

 

[Curtice]

There's no pre/post cat O2 sensor. The ECU adjusts the mixture by looking at the two O2 sensors and treats the straight 6 engine like two 3 cylinder engines: the front 3 and the rear 3.

So, you definitely need two O2 sensors, but there's no need for 2 cats unless you have to keep it for smog reasons.

I made my own exhaust for my 3FE swap by bending two down pipes that merged into a Y Pipe. I bought all my parts from Summit Racing and just welded the O2 bungs to the down pipes.

sounds like some skillz I don't have. I can probably have an exhaust shop do something like this, but was hoping to use the old stuff if possible. Has anyone used the fj62 y pipe to integrate?

 

[tornadoalleycruiser]

Hits frame . The 3f has 2 downpipes off exhaust manifold that will hit spring hanger. Need to be cut before transition to the y.

Sent from my SAMSUNG-SGH-I537 using IH8MUD

 

[Curtice]

Thanks...i'll have to figure that out at some point.

Next thing though is to get the flywheel, bellhousing, and new clutch installed. A couple of pics of my flywheel. There are some little hairline cracks all along the flat surface...I think you can see in these pics. A quick search said these are fixable. What is the best way to do that?

 

[scrapdaddy]

Take the flywheel to a auto machine shop and they will turn it down, within specs. Standard stuff.

 

[Curtice]

Thanks! Just called a shop and they will get me in and out real fast.

A couple more questions as I am getting ready:

1) I believe I can from what I have read, but just want to confirm...will I be able to use my same starter with the 3FE?
2) I don't think I will be able to fit the air filter assembly without moving things around. Seems like others have just put a cone air filter attached after the air flow meter. pappy in his document mentioned a supra adapter, I think...but I don't know the details. Thoughts?

 

[Stumpalama]

I plan to use a universal air filter box. There are cylindrical ones and a box type. They both house cone filters but also provide some protection from water intrusion. Spectre (the after market brand) make the cylindrical type.

 

[lelandEOD]

The air cleaner was a sticking point for me too. I almost went with the Supra/cone filter but a close friend really steering me toward the direction of staying with a Factory filter setup. I live in a high dust desert and I wanted to be sure to keep the engine as clean as possible. So, I went through a lot of headache to move the stock FJ62 air cleaner box to the driver's side fender.

Whatever you do, make sure the filter is adequate for your environment.

 

[Godwin]

1) I believe I can from what I have read, but just want to confirm...will I be able to use my same starter with the 3FE?

Yes you can, for a few months I used a starter from a '77 2F on a '88 3FE.

 

[Stumpalama]

lelandEOD: When you did your wiring, did you pull the stock dash harness out and run the required wiring for the 3FE ECU and other specific connections by removing the stock wires from the FJ40 harness and substituting in the 3FE wires? Or did you bundle the 3FE wires, run them seperate and tap the appropriate FJ40 wires for power and cut and substitute the new wires at the column connections leaving the dead runs in the FJ40 harness?

I am trying to build my plan of attack for wiring my 2FE and would like to avoid pulling the FJ40 dash harness if at all possible while still making a clean installation (read easy and logical to diagnose in the event of a fault).

 

[73tlcv8]

3fe wiring

As a point of reference, I removed the 40 harness from the truck, married in the few wires needed for the 3fe then wrapped it up and reinstalled.

 

[Curtice]

As a point of reference, I removed the 40 harness from the truck, married in the few wires needed for the 3fe then wrapped it up and reinstalled.

This is my plan. The ECU side of the harness can be kept separate except for one point where it joins in (I think). For the rest, I already pulled my 40 harness and once I get a 62 harness as a donor, will pull what I need and integrate.

Helpful pic by the way (looks scary!)

 

[73tlcv8]

It's also a great time to install another fuse block and incorporate wiring for future trail lights, radio, on board air, etc, etc. That's why mine looks like such a mess in the picture.

It really is very straight forward.

Your ECU will need a 12v signal from the brake lights and starter switch, and a connection to the VSS. Your new engine harness will have the signals from the new temperature and oil pressure senders for the gauge cluster. That's about all there is for mingling between the two. All you need then are the switched and unswitched power supplies for the ECU and a CEL. Nothing to it.

 

[Curtice]

just found this thread from 60 toy ota. He put a couple videos on how to do the wiring. I haven't watched it all yet, but seems to be very helpful.

https://forum.ih8mud.com/60-series-wagons/584944-red-bomb-gets-2fe-need-few-answers-4.html