# What to do with AIV & IATS when using an aftermarket fil **URL:** \ **Category:** SON240sx Automotive\ **Created:** [July 12, 2004, 5:46am UTC](https://forums.speedlife.net/t/what-to-do-with-aiv-iats-when-using-an-aftermarket-fil/81257 "2004-07-12T05:46:24Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![sirdriftalot](https://avatars.discourse-cdn.com/v4/letter/s/d78d45/32.png) [@sirdriftalot](https://forums.speedlife.net/u/sirdriftalot)\ **Post date:** [July 12, 2004, 5:46am UTC](https://forums.speedlife.net/t/what-to-do-with-aiv-iats-when-using-an-aftermarket-fil/81257/1 "2004-07-12T05:46:24Z")
I just installed an aftermarket filter and filter adapter on my 1990 240sx today. I was wondering what do I do with that hose that comes from that emissions control box (AIV = Aux Intake Valve) and that sensor that use to go into the air box? (IATS = Intake Air Temp Sensor) Brent - edited by: SHIFT\_SR20DET ---
**Author:** ![Gonad](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/gonad/32/5481_2.png) [@Gonad](https://forums.speedlife.net/u/Gonad)\ **Post date:** [July 12, 2004, 7:26am UTC](https://forums.speedlife.net/t/what-to-do-with-aiv-iats-when-using-an-aftermarket-fil/81257/2 "2004-07-12T07:26:33Z")
Put a breather filter on that hose. You can get one for a few bucks from Canadian Tire. ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [July 12, 2004, 8:53am UTC](https://forums.speedlife.net/t/what-to-do-with-aiv-iats-when-using-an-aftermarket-fil/81257/3 "2004-07-12T08:53:15Z")
> [@Gonad](#): > > Put a breather filter on that hose. You can get one for a few bucks from Canadian Tire. Honestly Brent, I would not put a breather filter on it because that’s the 1st thing’s cop’s look for under the hood of a car when checking for modifications. Your best bet is to remove the whole AIV system. And Cap it off right at the manifold. Then when they check it, it looks like nothing was there to begin with. As for that Air Intake Temp Sensor just Zip Tie it somewhere as close as you can to your Intake Filter. If you can Right on to the filter would be best. ---
**Author:** ![Jesse](https://avatars.discourse-cdn.com/v4/letter/j/c77e96/32.png) [@Jesse](https://forums.speedlife.net/u/Jesse)\ **Post date:** [July 12, 2004, 9:57am UTC](https://forums.speedlife.net/t/what-to-do-with-aiv-iats-when-using-an-aftermarket-fil/81257/4 "2004-07-12T09:57:33Z")
i put a longer hose on mine, and made it run to no where but it looks like it goes somewhere ---
**Author:** ![Jay240](https://avatars.discourse-cdn.com/v4/letter/j/57b2e6/32.png) [@Jay240](https://forums.speedlife.net/u/Jay240)\ **Post date:** [July 12, 2004, 3:59pm UTC](https://forums.speedlife.net/t/what-to-do-with-aiv-iats-when-using-an-aftermarket-fil/81257/5 "2004-07-12T15:59:42Z")
So wouldn’t removing the whole AIV system, or attaching a longer hose affect the car in some way? Or is it just a minor thing? Also what will happen if you dont attach the sensor to/near the filter? ---
**Author:** ![sirdriftalot](https://avatars.discourse-cdn.com/v4/letter/s/d78d45/32.png) [@sirdriftalot](https://forums.speedlife.net/u/sirdriftalot)\ **Post date:** [July 12, 2004, 10:08pm UTC](https://forums.speedlife.net/t/what-to-do-with-aiv-iats-when-using-an-aftermarket-fil/81257/6 "2004-07-12T22:08:21Z")
perfect thanks for the help i am going to run a longer hose to no where and put a filter on it… that way its outta site and still runs good Brent ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [July 12, 2004, 10:49pm UTC](https://forums.speedlife.net/t/what-to-do-with-aiv-iats-when-using-an-aftermarket-fil/81257/7 "2004-07-12T22:49:20Z")
> [@Jay240](#): > > So wouldn’t removing the whole AIV system, or attaching a longer hose affect the car in some way? Or is it just a minor thing? Also what will happen if you dont attach the sensor to/near the filter? The AIV takes air from the Air Box and sends it into the exhaust manifold after the O2 sensor, buy doing this it heats up the cat quicker and keeps it hot at idle. As for the sensor you will not be reading the actual temp going into your intake and your computer will then send the wrong amount of fuel in causing poor power and poor fuel economy.