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G20 Junkee
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There are two devices attached to my exhaust manifold labled 1) and 2) can anyone tell me what these are and what they do?


 

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Here is a write up to remove it from Ben Davis:

This is the AIV hose. On all 5-6 AIV systems I've removes, of them had a
LOT of water in the AIV valve on the front of the valve cover. Just remove
the system.

1. Remove the line that goes to your airbox and duct tape up the hole on the
INSIDE of the airbox. It's nice and flat in there so the tape should stay
very well.

2. Remove the AIV valve and small resonator box on the front of the valve
cover.

3. Remove AIV hard line going into the exhaust manifold. Cut it off with a
hacksaw or something close to where it screws into the manifold. Hammer the
place where you cut flat and then fold it over about 3 times. Should end up
looking like this http://www.sr20deforum.com/geekout1/DSC00009.jpg . Screw
that back into the exhaust manifold which effectively plugs that hole.

4. Trace the small hard line back that was connected to the AIV across the
valve cover to a vacuum line that goes into the intake manifold. Remove the
hard line and plug the hose with a bolt/screw.

Voila! No more AIV system and no more water in your intake. :)

Ben Davis
AIV system removal expert
 

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More details on the AIV:

On SR20DEs from 91-93 you also need a small filter for the AIV (Air Induction Valve) to stay smog legal. The AIV is there to dump more air into the cat to keep it lit on idle and decel, by removing the OE air box you will now hear the reed inside the AIV canister. It makes a "spitting raspberrys" sound at idle and decel, it is completely normal, you never heard it before because the OE air box muffles this sound. In 94 and 95+ the AIV should be gone as Nissan improved the engine program enough that the ECU can control the engine well enough not to need the extra air (by fiddling with the mixture and timing).
Courtesy of:

http://www.sr20de.net/engine/about_intakes.html
 
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