I have a 86 4Runner with a 22rec engine, and I'm planning on putting a open element(K&N) filter on it, which will take a bit of modification. My question is, there is a electronic hookup on top of the air box, is this the air temp sensor? What effect will it have if I unhook this? Is it a nessasary to have, or can I run the open filter set-up without it? Is there also a air flow sensor that I will have to worry about as well?
any advice, input, etc would be great!

 

The box is the airflow sensor. Disconnect it and your engines dies.

 

so if I build a new box to hook to the K&N and have this sensor as a part of it, it should still work?

 

it works off a flapper type butterfly. i have seen on some rigs where they run K&N filters, but i don't know how they get around mass airflow sensor. the butterfly is built into the top of the airbox, i think.

 

this is whatyou do as i did just what your trying to do ok go to autozone or something like that go into the tunner (honda lots of sound but car goes nowhere) alse and look for a mass air flow adater cant spell lol its round and has a few holes in it on the flat part and its about 20 bucks you redill the holes cause the toyota air flow is smaller use the gaskets and bolt her up and there you go oh and the air flow just unbolts off the air box ver easy

 

come to think of i guess they do unbolt,since they are replaceable.

 

The air flow assembly is removable from the airbox. But I don't know why you would want a K&N filter under the hood. It will suck hot air from the engine compartment and K&N filters are not very good at filtering.

 

X2, don't put on a K&N. Worst filter out there.

 

ok, seems the advice is to stay away from the K&N. what about the "deck plate" mod for improving airflow. Or maybe a additional airflow tube into the airbox?

 

That's a better idea, I'd see if you can get a tube to breath from inside the fender. That's what I did when I moved my airbox to the other side for a 3.4 swap:
A 3.5" hole was cut in the inter-fender for the air supply:


I cut a 3.5" rubber flex coupling from the plumbing dept at Lowes to seal up the hole and keep the engine breathing the cooler air outside the engine bay:


Here's a view from inside with the turn signal removed:

https://www.yotatech.com/forums/f116...tml#post981811