Ok I have an 86 4runner with 22re and auto tranny. I have found a random wire with no home. it comes out from under the plenum coming from the same section of harness as the fuel injectors and such. Anybody have a clue where it goes? Random green wire with black stripe all alone?

 

the only thing down there is the oil pressure sensor and the knock sensor

is your oil pressure gauge working?

 

Well i don't have an oil gauge. Just an oil light and as far as I know it works. Isn't the the oil temp sender near the oil filter? If thats the sender it has a wire connected to it. The knock sensor is in between the valve cover and the plenum right? If so then it also has a wire connected to it...?

 

Do you or have you had AC on this truck? It looks like it could be the AC clutch solenoid wire. It's in the right general area. Just a guess.

 

Just looked over a wiring diagram for 86 and it shows the green/black wire going to a simple water temperature switch (cold-grn/blk open, warms up- grn/blk grounded) but does not call out the function of the switch.

 

hmmm not too sure where that switch would be...

 

Does it run/drive fine, and everything works?

 

i have a 90 toy pickup regular cab 22re 5 speed. there are several unused plugs under the hood. toyota must have used the same wireing harness for muitlple models. some plugs are simply not used for some models

 

LOL I was looking at my engine bay yesterday and found thatr same exact wire in the same shape. My truck runs. also not sure of the wire.

 

yeah my truck runs well but i hate thinking that ive got something not working that should be

 

I wouldn't be too worried about it. Who knows, you might hook it up and cause a problem. lol

 

Toyota did use the same harness with all the plugs and what not regardless of options. I'm sure if you look around more you will find more "useless" plugs.

 

Like my center console rear heater harness.....

I've seen a couple different vehicles with roll up windows that had the wiring harness inside the door for power windows. Seemed kinda pointless to me, like why wouldn't they just finish the job, and put the motor and switch in? lol

 

mine has the same green and black wire hanging out in the same spot not connected to anything. it runs great so i have no clue what its for.