exhaust egr?

[raynon2]

Hey, i'm new here, but i've read a lot about the 240sx. I bought a 93' 240sx with the stock KA24DE. The guy who had it before me put an aftermarket air filter on it and therefore deleted the entire air box assembly. But now there is a black hose that usually attached to the box that is now just handing there. He blocked it off with a cork. The hose goes to a little black box besdie the power steering reservoir. Then goes down into what looks like some sort of valve contraption. From there a tube comes out and down underneath the exhaust downpipe. I always thought that this was the egr, but now i see that the egr valve is actually located near the inatake manifold.

Does anyone know what that little black box is? heres a link to a picture of it on myspacehttp://viewmorepics.myspace.co...43d89
Modified by raynon2 at 12:09 PM 12/17/2008

[modulation]

It's the 2ndary air injection system.

It injects fresh air into the exhaust stream before the cat at certain rpms (like idle I think) to introduce more oxygen to the cat and help it be more efficient.

[raynon2]

OK thank you. i just found a page somewhere else about it actually but it was a little confusing as to what its purpose is. So exhaust gases never come out the other way? It only alows fresh air into the exhaust? How does it keep exhaust from getting into the intake? Do you know if it will be able to pass the etest without it hooked up?

[Cone Junky]

It uses a spring loaded valve to keep exhaust from going back to the airbaox. If there is a cork in the box, then there is no airflow going into the exhaust, therefore the secondary air injection system is inoperative.

Will it pass a tailpipe test? Maybe. Will it pass a visual test? No way.

[vancouverbc]

It uses a spring loaded valve to keep exhaust from going back to the airbaox. If there is a cork in the box, then there is no airflow going into the exhaust, therefore the secondary air injection system is inoperative.

Will it pass a tailpipe test? Maybe. Will it pass a visual test? No way.

zerothread/254273

do you have an idle test in ontario because aiv helps during idle except in california where they have different ecu's.

[vancouverbc]

reed valve keeps exhaust out but it fails with age.

[raynon2]

Yes we do have an Idle test in ontario, in fact the emissions here are about as strict as california. So hopefully it still works. I think i'll just unplug it so that it can at least let fresh air into the exhaust. But someone said that the valve can fail over time and let exhaust fumes out the other way, so hopefully thats not the case.

Also, does anyone have any suggestions for where I should buy a new exhaust manifold, downpipe, and muffler? I would like to get one that has a port for the AIV aswell.

thanks

[vancouverbc]

Yes we do have an Idle test in ontario, in fact the emissions here are about as strict as california. So hopefully it still works. I think i'll just unplug it so that it can at least let fresh air into the exhaust. But someone said that the valve can fail over time and let exhaust fumes out the other way, so hopefully thats not the case.

Also, does anyone have any suggestions for where I should buy a new exhaust manifold, downpipe, and muffler? I would like to get one that has a port for the AIV aswell.

thanks

as long as the hose is not connected to air filter box , leaking exhaust just goes to atmosphere

[g35paul]

dont most people just take this whole system out? my hose is broken from my air box nd i was just going to remove it all and block the little metal tube... weight reduction and alot more room to work on PS

[vancouverbc]

dont most people just take this whole system out? my hose is broken from my air box nd i was just going to remove it all and block the little metal tube... weight reduction and alot more room to work on PS

if you dont have an emissions idle test it might be ok to remove. i kept failing my emission until i bought a new one. most people will tell you to remove stuff, but it is probably better to keep all this stuff. just disconnect air hose so exhaust doesnt get into air intake. the computer ignores the o2 sensor during idle (except in california) so you need the aiv to control things during idle. lots of misinformation on the net.

[g35paul]

well my hose is actually broke off the airbox anyways and i just have it hanging there, so i guess im bypassed on it anyways, but imm probably going to remove it tomorrow cuz i have a PS leak and with it out ill have alot more room to work on the power steering... and more room for a turbo in future

[raynon2]

Hey, sounds like we're both in the same predicament! I have a PS leak aswell. Let me guess, is it the high pressure line that runs from the top of the pump down into a larger hose through a sensor, and then on to the rack? If so, where did u find a replacement line?

[del82]

Most of it's already been said, but if you don't have your factory airbox and aren't keen on drilling a new hole, you can get by with a $5 valve cover/oil breather filter from the auto parts store, stuck onto the end of that dangling hose. It originally draws out of the airbox (unless i just missed something obvious in the description, it *is* late), but so long as it's drawing in fresh filtered air there's no problems. If you're on the cheap you can bend some coat hangar wire to support it so it isn't flopping all about your engine bay, assuming it needs it. Provided the AIR pump (stands for air injection reactor, actually) still functions, it shouldn't be any problem with your emissions.