This is a spin off of my stalling thread. Went to a local pull-a-part yard and found a Thottle Body Assembly with the attached/incorporated Idle Air Control Valve from a 92 3.0 4runner. It seemed to be in realitively good condition. It was relatively easy to remove once you understand what connections go where and how to unhook the throttle cables.

Removal was simple enough, disconnect the control cables, remove the coolant hose lines, fuel line, vacuum hose lines and then 4 bolts.

Now my question is just exactly where is the Idle air control valve? I identified the side vents in the throttle body as the ports for the bypass but I read in some other threads about the idle adjusting screw. I can't seem to locate it. anyway, here are the pics of the TBA







What is the best solvent/cleaner to use in preparing this for installation? What should I be looking for in trying to test this unit for proper operation? I know I am going to have to go to Toyota to get the TBA gasket. Just wanting to know things I should be aware of from those of you who have replaced their TBA. Thanks again for any and all comments

 

Someone on here once posted OVEN CLEANER to get rid of the carbon build-up.

So I tried Easy-Off (it contains Sodium Hydroxide a.k.a. Lye) and yeah, it works! I duct taped a stick to an old toothbrush to scrub it without taking the TB off.

Just be careful where you spray... it will ruin the paint on your valve covers.

-Tom

 

brake cleaner, throttle body cleaner, or carb/choke cleaner

 

Now THAT'S funny!

Going to go with the carb cleaner. Seems to be the least likely to cause any issues. Will post up results. Next big challenge will be to get her to bring me her truck!

 

Throttle body cleaner, thats what its made for. I got my gasket at O'reily. Make sure you turn the throttle body in all directions and shake it out good. There are a lot of places for the cleaner to hide inside.

 

DO NOT use carb cleaner!!!!! Bad things will happen!!!!

Use throttle body cleaner, CRC makes a good product: http://www.amazon.com/CRC-05078-Thro.../dp/B000M8PYO2

 

Well I went to Shucks/O'Reily and asked them about the carb cleaner verses Throttle body cleaner and as I have removed the TBA I should not have to worry about using the carb cleaner. I had used the carb cleaner with a toothbrush, flushed it throughly and then used compressed air to blow out all the ports and lines. I used paper towels to wipe down the exterior and in the throat of the TBA. The guys at the parts store said that with the TBA removed and cleaned then I would not have any problem with using the carb cleaner. So what is your concern Pismo? Are there some internal components to the TBA that I should be concerned with?

 

Ohhh, gotcha.

Nevermind, you used compressed air which would be acceptable to blow out all of the leftover carb cleaner.

Carb cleaner can harm fuel injectors if it does manage to reach them, just making sure you didn't create another issue lol. I don't think any throttle body components can be harmed, but don't quote me on that.

 

Thought that might be the case but as I had them completely removed form the engines (donor motors) and it will be God knows how long till I get my daughter to bring me her truck to pull the TBA and swap it out, I'm feelin pretty safe that they will have "aired out" significantly before they get mated back up to an intake manifold! thanks PJ

 

The only issue I can see you running into would be if you didn't remove the TPS beforehand. Of course, carb or TB cleaner could hurt that.

If you want to test it before you put it on the vehicle, warm it up in a pot of water with just enough water to submerge the valve portion. The valve should close making it impossible to blow air through the IAC valve ports. (Ports are illustrated in the link I posted in the other thread) The valve is on the bottom of the TB. You can see the black cover with the small screws. Inside there is the valve. You'll want to remove the throttle dampener, dashpot, and TPS beforehand.

The idle bypass screw is the only large flathead srew on the TB. Located on the side where the throttle linkage is.