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Hey guys I have a 93 classic. While I was removing the stock airbox to install an intake I found 3 or 4 hoses going into the intake--and a scrunched box under the main intake hose before the TB. Can I remove and plug these hoses and still idle ok--if so which ones? I am not concerned with emmisions at all. I am concerned with making more room in the engine bay. Also--this aiz or whatever in the front of engine--above exhaust mani---can I scrap that whole system as well? Anybody have any experiece with what I am talking about?

I appreciate your help and suggestions

Mark

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93 se-r
so stock--it is scary
 

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If you're not concerned with emissions at all, which is understandable because I"m not either here in Indiana. You can go ahead and remove just about all of that junk! Before I did my DET swap I had removed the EGR/BPT valves and accompanying vacuum hoses, the AIV and all hoses and some other junk as well. I did not remove the EGR tube from the exhaust manifold simply because I didn't want to put that much work into an engine that was coming out very soon, but you could do that too. And you could remove the AIV tube to the exhuast manifold as well. What you have to be very careful about is examining the vaccuum hose system. Study the hoses and figure out what does what and what signals are going where and what devices are seeing what signals. Once you remove all the emmissions junk you'll see that you can probably simplify the vacuum system down to a just a handful of hoses. My DET has a total of about three vacuum hoses because there is not EGR or AIV. Very nice and simple.
 
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I took off the BPT and plugged up all the remaining hoses. The car runs fine.
As for the aiv( or whatever) Im not too sure.
I want that off too.
If I had the time I would take it off and expiriment with it. I know ser.net has a story about taking off the EGR and BPT.
 
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The thing on top of your exhaust manifold is the PAIR valve which sends secondary air to the exhaust manifold using a vacum created by exhaust pulsation in the exhaust manifold. When their is negative exhaust pressure the PAIR valve sends air in, when positive pressure exits the valve prevents air from going in. It looks like both the exhaust manifold pressure and the ECU play a roll in the activation of this valve. I didn't have this valve on my DET or DE(T) and I did experience some small problems with both my steady idle and with stalling on deceleration. I believe that JWT offers a program to aleiviate this problem, for those of us with JWT ECUs.
 

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I removed the AIV junk on the front of my engine. But, I also have JWT ECU and had it programmed to run cleanly w/o it. As for the plug, you're not going to find one in a hardware store. HS sells AIV plugs, but it'll cost you $15 to get it to you.

The cheapest way to do it? Break the AIV tube near the exhaust manifold and seal it by welding it.

Disabling/removing the EGR system has no effect at all on performance. The EGR system kills a lot of the really bad NOx gases for our environment. So, if it were me, I'd leave it there. It would be pain to strap it back on when you're over the NOx limit for emissions tests.

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Antonio Garcia
91 SE-R w/ lots of stuff
Bay Area, CA
 
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Bmoses,
Great info !!!!
As soon as I have the time Im going to attack the EGR and AIV. Do you know what size plug I would need to screw in the hole that the AIV goes into on the manifold?
 
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