okay I plan on doing a 3.4 swap this spring i have a 91 4runner with a 3.0 i have a motor still need to get the harness out of the donor rig but all the research I've done they make wiring sound hard anyway if I were to have aftermarket gages for tach temp oil ect would I really have to worry about a body harness part? As long as I get power to ecu and can start it should be easy no?? I really wish there was a detailed description on the internet basic step by step if anyone in the tricitys wa area around pasco wa has a 3 4 swaped one I could look at that would be much appreciated thanks

 

Lol, well there's an entire subforum dedicated to doing 3.4 swaps. The wiring is not hard if you have the wiring schematics for the current vehicle and the donor vehicle.

 

https://www.yotatech.com/forums/f160/

 

https://www.yotatech.com/forums/f116...e-swap-314761/

 

If you can read wiring diagrams and know how to solders and crimp wires, you can do this.
I'm colorblind and I did it. Pass CA smog even.
There's a sticky thread with info on how to download all the wiring diagrams you need. It may take a while. Hope it's not your daily.
Good luck.

 

unfortunately there is no simple answer or step by step how to when it comes to wiring these up since it is specific to YOUR vehicle and YOUR donor.
wire colors and sensors were changed from year to year and may even depend on where it was made, Japan vs America.
I started my swap by selling my 3.0 running and driving engine transmission and transfer case still wired up with the ECU to a fella in my neck of the woods who had a 4 runner one year different from mine.
It turned out that he kept his tranny, t-case, wiring and ECU because his 94 had a speed pickup on the t-case and my 95 had a cable. This left the wiring harness from mine lacking two wires that he needed.
Anyway, unless someone has done EXACTLY the same swap with the same donor as you they will only be able to tell you "whip out the specific wiring diagrams and start matching up circuits or buy a pre-made swap harness for your specific swap"

 

Okay thanks i guess I will just deal with step bystep

 

Lol, don't we all !

 

Watched a quarter of the video with the guy talking anyway 5 days come on that sounds a little crazy coming from people that work on these for a living i was thinking a 3 day weekend type deal sounds like they might have ran into a hole bunch of problems im thinking it will take me 2 to 3 days solo most of the time helper might or might not want to help

 

If you want to finish in a 3 day weekend you should just bite the bullet and buy all of the convenient parts that are offered online, battery tray, battery extension harness, pre-made conversion harness, power steering hose etc.
there are a ton of little details that will make or break your swap.
Are you cutting a hole in the hood or doing a body lift?
Will you be swapping oil pans? is your truck IFS or SAS?
If you make it happen in 3 days make sure to let us know, cuz that might be a record!

 

We did mine on a three day weekend.

 

wow, I have a couple of questions.
how many people was "we"
did you do your own wiring or use a conversion harness?
was that just getting it running and still had stuff to button up later?

 

There was a lot of vodka.
Day one: removed old engine and prepped engine bay
Day two: installed 5VZ and fired it before midnight
Day three: buttoned everything up, including exhaust.

Long days for sure, took 41 of the 72 hours to do it. Myself and four (?) others and no conversion harness or ready made exhaust crossover. Also, vodka.

On a side note, myself and two others did a 2nd gen 4runner in one day. .....so.....

 

Wow, I don't ever plan to have that much practice. Once is enough for me.

 

Swapping V6 to V6 is easiest. My '86 was a 4cyl and that is way more complicated.