OEM plastic intake picture needed

[jza80king]

Hello guys, I've been a part of this forums for a long time and while I usually read and research what I need here, I haven't been able to find what I need.

I'm hoping someone can share a picture of where this hose line connects from the plastic nipple circled below, to where else. I searched the FSM, but I can't find anywhere in there where it'll show me where this hose connects to on my KA24DE. Can someone help me out because I accidentally broke off the nipple and I'm searching for where the hose connects to. I'm also looking to buy another factory plenum/pipe if anyone has one for sale. Thank you guys.

[VStar650CL]

I think that would be the air bleed for the IACV / FICD (red). It should feed into the hard lines under the intake manifold.

92 240SX 1.jpg (86.67 KiB) Viewed 669 times

[jza80king]

Hmmm I guess I need to check again on the hard lines to the intake manifold. When I looked underneath the plastic accordion pipe just before the throttle, there's another T looking nipple and I assumed maybe it connected to that but I want 100% sure so that's why I posted, hoping someone who hasn't deleted anything on their engine could confirm.

[Tobz]

vstar is correct that goes to the IAC plumming

[jza80king]

Thank you for confirming. I was able to verify that it goes to a hard line under the intake manifold. One last thing, the line Tees off and has an open nipple. I dunno if that's how it should be or if there's another line off the tee. I drove the car yesterday and the day before and no issues idling or anything. One would assume it might have an idle issue if that tee was supposed to be capped off??

[VStar650CL]

That tee isn't really seeing any vacuum, it's supposed to allow vacuum from the manifold to pull air through it from the inlet duct when the IACV and FICD need it. So an open tee will result in the MAF reading being screwed up, since it will allow the IAC/FICD to use engine compartment air (unmetered) instead of air from the inlet duct (metered). It won't behave like a leak of manifold vacuum, but it will affect idle and performance. You notice on the diagram that the red line should go three places. the air regulator, IACV, and FICD. Check if one of those is disconnected. If they're all hooked up then that tee should be capped.

[jza80king]

That tee isn't really seeing any vacuum, it's supposed to allow vacuum from the manifold to pull air through it from the inlet duct when the IACV and FICD need it. So an open tee will result in the MAF reading being screwed up, since it will allow the IAC/FICD to use engine compartment air (unmetered) instead of air from the inlet duct (metered). It won't behave like a leak of manifold vacuum, but it will affect idle and performance. You notice on the diagram that the red line should go three places. the air regulator, IACV, and FICD. Check if one of those is disconnected. If they're all hooked up then that tee should be capped.

Ok so I got the hose connected now to the inlet duct (see red outline). The T is pictured below, you can see the hose from the inlet duct comes in from the right then there's a T and line that goes down toward underneath the intake manifold presumably into the IAC/FICD (that's the blue outline).... Where does this other T go to though (yellow outlined Nipple)? I've never pulled any hoses off so I'm wondering if someone else can check their line and see if it's an open T or if a line runs somewhere from that open nipple.

[PapaSmurf2k3]

Interesting. I wonder if that's just a 3 way valve that needs to see atmospheric pressure on one side or something.
It looks shinier/cleaner on the port though, suggesting it had something on it for some time, unless you wiped it all off. If you put your finger over it with the engine running, does it change idle at all?

I deleted all that stuff from my 240 haha... the only hose I have coming out of the intake tube (which is now a charge tube) is for the idle air control valve.

[jza80king]

Interesting. I wonder if that's just a 3 way valve that needs to see atmospheric pressure on one side or something.
It looks shinier/cleaner on the port though, suggesting it had something on it for some time, unless you wiped it all off. If you put your finger over it with the engine running, does it change idle at all?

I deleted all that stuff from my 240 haha... the only hose I have coming out of the intake tube (which is now a charge tube) is for the idle air control valve.

Very weird yeah.... When I put my finger over it, it makes no change in idle at all.

[VStar650CL]

Very weird yeah.... When I put my finger over it, it makes no change in idle at all.

It won't unless the IACV or FICD is active. That's what the line feeds, and closing it off will only affect the MAF readings.

[jza80king]

Very weird yeah.... When I put my finger over it, it makes no change in idle at all.

It won't unless the IACV or FICD is active. That's what the line feeds, and closing it off will only affect the MAF readings.

So are you thinking that should stay open like that? I wasn't planning on capping it off by the way.

[VStar650CL]

If it isn't hurting cold performance or destabilizing the idle with the A/C on, I'd say it's probably harmless to leave it open.

[jza80king]

If it isn't hurting cold performance or destabilizing the idle with the A/C on, I'd say it's probably harmless to leave it open.

Gonna leave it open as is... Thanks for your input.