what does that box do

[Queamore]

what does that little box for that is right behind the coil. Does it have something to do with the brakes?

[corn322]

it's some system that I've heard lets air from the intake flow into the cat converter, so it heats up faster.

[quiksilvia]

thats a dirty engine bay, and its nothing to do with the brakes, there was a post on this yesterday

[Nismo1182]

there was a post on this...

anyway, corn322 is right.

you can take out the box and buy a metal plug to block off the hole that will be left at the header or keep the metal piping with ruber hose and put a plug on the rubber hose. Taking out that box will not damage anything or throw any ecu codes. Trust me I know

You may not want to take it out if you live in a state that does emissions testing.

[theronin]

there was a post on this...

anyway, corn322 is right.

you can take out the box and buy a metal plug to block off the hole that will be left at the header or keep the metal piping with ruber hose and put a plug on the rubber hose. Taking out that box will not damage anything or throw any ecu codes. Trust me I know

You may not want to take it out if you live in a state that does emissions testing.

He could just reinstall it for emissions though eh?

[wiwalsh]

thats the AIV, it is basically a check valve that maintains positive pressure in the exhaust. It just happens to pull air from behind the filter.

It is emissions, but I had a slight degredation from plugging it, so I cut it and put a filter on the end of it and plugged the hole in my intake plenum.

(note: my car is a slow POS right now, so degredation might just be something else starting to fail....)

[Queamore]

Well I don't want to take it out It's just that the car was sitting up for two weeks and I had noproblems with the brakes. Then I finsh changing the head and now my brakes are going all the way to the floor. I don't see any leaks but it feels like I go t air in the lines. Do you think the master cylinder went out just sitting there?

[jrc90240sx]

my clutch master cylinder went out, but my car sat for 6 months.

[Queamore]

That car has beens sitting for over a year the most it has been driven was around the block like twice. and it's still sitting there until I decide what I want to do with it.

[red240ne]

don't just plug up the box. you can plug up the hole on your header or manifold, but not just the hole on the box w/ the AIV still connected.

And if you disconnect it, remember to plug up the hole that will be left on your intake.

[driftn240]

I'd look for cracks in the vac. line to the power booster behind the mastercylinder. If air gets in there you'd notice. As for the black box, I took it out due to a hole in the side of it and put on a simple breather filter since I still have my AIV. The breather also makes more sense to me since the box is completely hollow.Good luck.

[trpower7]

Search for AIV. This has been discussed a million times with appropriate and correct answers to all yoru questions.

[Queamore]

Thanks for everyones advice. I'm actually gonna take it and everything else out and drop a LT1 in like Aries. I'm starting next week.