the-one1

h-t noob poster, long time reader
what is the 3rd hole for in intake for 99-00 ex. i kno one is for air temp sensor, the other is to the valve cover. the reason i need to know is cuz i broke min and need to know what its called to buy another one, and also what it does. thnx. any help appreciated

vtecvoodoo

it`s the "bunghole".

Marauder

Yes, in the CAI there are three ports

- Air temp
- valve cover breather
- air-injection (hose from CAI to thermal switch in coolant thermastat housing)

I thinkvtecvoodoo needs some TP...TP for his "bunghole"

the-one1

thnx for reply
what does the air injection do? since its not on the older d16y8(96-98 civics) i'm having idle problems because of it.

deepnite

NOS hookup hole

Marauder

I'm not too sure what the air-injection does. I know it is only operational before the engine warms up. The manifold vacuum draws air from the CAI and circulates it threw the tip of the fuel injectors. I have not had problems with it on my car, but its always been hooked up. I have heard of other Honda models with the same setup not idling correctly after the air-injection was removed.

SixPAK

To get rid of that vacuum problem you can take the injectors out, wrap electrical tape around the hole that you see on the side of the injector, and put it back in.

igo4bmx

i just thought about how i have air injection hole, but soon when i install my greddy turbo kit, i will not have a place to connect thatline.. hmmm

Marauder

What about just putting a vacuum cap on the 8mm hose end sticking out of the manifold. No need to take about the fuel system for that.


If you are going to take things apart, might as well plug all the vacuum holes in the manifold for the air-injection system, and remove the plastic tip on the fuel injectors and just keep the top injector seal in the manifold.