2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Where does this vac line go to?

Old 02-06-07 | 04:18 PM
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Where does this vac line go to?

Hey guys,
Just putting my manifold back together after replacing some vacuum lines and the injectors. I have everything sorted out as far as where all the lines go to since I labeled them. But there is just this one line I can't seem to find where it goes to, and I labeled it too! I can't find the nipple where it would even go to. BTW, it's an '88 turbo.

Alright, it's a 6mm hose, not 3.5mm. It is the middle of the three hoses that come off of the rear side of the UIM.


I attached a picture I have been trying to use for reference, but it shows only the lines for after emissions.

It's the only hose I can't find where it goes, and it's so frustrating! Ahh, I bet it's really simple. Haha oh well, please let me know if you knw where it goes.

Thanks,
Jordan
Attached Thumbnails Where does this vac line go to?-middlevacline.jpg   Where does this vac line go to?-s4_turbo_emissions_removal.jpg  

Last edited by JFR; 02-06-07 at 04:25 PM.
Old 02-06-07 | 04:31 PM
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IIRC its either for the fuel pressure reg, or it goes to the nipple between the oil injectors on the LIM.
Old 02-06-07 | 04:34 PM
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Well I know it doesn't go to the FPR, but I'll have to check inbetween the oil injectors. The only thing is, I thought all the vac lines from the oil injectors were routed together with the injector bleeds then out to one hose? You know, that goofy 4 to 1 hose apparatus? haha
Old 02-06-07 | 04:36 PM
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FPR doesnt come off the throttle body, it comes off the vac rack.
Old 02-06-07 | 04:38 PM
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Right, so do you know where the hose goes to then?
Old 02-06-07 | 04:38 PM
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i thought it went to the actual oil injectors
Old 02-06-07 | 04:39 PM
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Originally Posted by mort2002
i thought it went to the actual oil injectors
The oil injectors use the smaller, 3.5mm hose.
Old 02-06-07 | 04:43 PM
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well they all group up into a 4 to 1 connector, and that 4 to 1 connector uses the bigger vac line...
Old 02-06-07 | 04:43 PM
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Originally Posted by classicauto
IIRC its either for the fuel pressure reg, or it goes to the nipple between the oil injectors on the LIM.
That nipple yo uare talking about is behind both oil injectors, right? Not inbetween, because I don't see anything inbetween and the length of the hose is too short to reach the nipple you're talking about. The line from that hipple goes to the top nipple of the three on the rear of the UIM.

So it's not to the FPR, the oil injector itself, or the nipple behind the oil injectors.
Old 02-06-07 | 04:45 PM
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Originally Posted by mort2002
well they all group up into a 4 to 1 connector, and that 4 to 1 connector uses the bigger vac line...

Hmmmm... that makes sense... but why was able to fit a 3.5mm hose in it? I'm going to go see if those two hose lengths match up.
Old 02-06-07 | 04:47 PM
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been there... done that.. multiple times
Old 02-06-07 | 04:52 PM
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Yeah... just checked but 3.5mm seems like the right fit. And the hose coming from the 4 needs to be long, and I have it cut short, about 4 or 5 inches. And this is matched to the old hose length.
Old 02-06-07 | 04:55 PM
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Gosh, I wish I had a laptop to take out to the garage so I don't have to run out there, come back in, run back out, and so on. Pretty cold too...
Old 02-06-07 | 04:56 PM
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so is it right or what... that just seemed like babble...
Old 02-06-07 | 05:02 PM
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Originally Posted by mort2002
so is it right or what... that just seemed like babble...

Alright, sorry, I guess it was a little haha. I went back out and checked and you're right. But because you're right, I now have this other 3.5mm hose(the one I thought went on the 4-1 thing) and I think it goes to this plastice nipple from the throttle body but I don't know where it goes to now. I'll try and show you... it's the nipple on the yellowish/tan piece in the front of the picture I took. I don't know what it's called though.

It's in the lower left corner of that picture with a black line coming from it, if that helps.
Old 02-06-07 | 05:07 PM
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Originally Posted by JFR
The line from that hipple goes to the top nipple of the three on the rear of the UIM.
Ahhhh the top, thats what I was thinking. My bad on that one....

And yes that was the one I was talking about. I suppose it is a little behind them, but in-between gives a good idea of where its at
Old 02-06-07 | 05:10 PM
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Originally Posted by classicauto
Ahhhh the top, thats what I was thinking. My bad on that one....

And yes that was the one I was talking about. I suppose it is a little behind them, but in-between gives a good idea of where its at
Haha, don't worry about it, there's so many little things on these cars, it's hard to keep track of everything.
Old 02-06-07 | 05:29 PM
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Is it the water thermovalve the thing I'm talking about? There are two vacuum hoses from that, correct?

Anyone know where that vacuum line goes to?
Old 02-06-07 | 06:47 PM
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Lots of pics on this thread, but it's hard to see the lines you're asking about...

https://www.rx7club.com/showthread.p...4&page=1&pp=15
Old 02-06-07 | 07:18 PM
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Originally Posted by buttsjim
Lots of pics on this thread, but it's hard to see the lines you're asking about...

https://www.rx7club.com/showthread.p...4&page=1&pp=15
Yeah, I saw that, but I don't see the water thermowax thing with its vacuum lines. hmmm
Old 02-06-07 | 09:24 PM
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The bottom nipple of the three that are one above the other, goes to the water thermovalve in your picture. The other nipple on that waterthermo valve goes to the double throttle diaphram. See the online FSM for locations.
Old 02-10-07 | 11:52 AM
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How come I only have 3 nipples on the rear of the intake? Because if there were 4, I don't think I would still be having trouble with this.
Old 02-10-07 | 12:21 PM
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Originally Posted by JFR
How come I only have 3 nipples on the rear of the intake? Because if there were 4, I don't think I would still be having trouble with this.
I GUESS it MIGHT be because they eliminated the SubZero system and did not need that top nipple anymore. I really don't KNOW.

No matter. Three or four, only one has vacuum and that always the bottom one that goes to the water thermowax to the left of those four/three nipples.
Old 02-10-07 | 12:32 PM
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Yeah, hmm I was looking at other threads about this and I've seen many where peple say they have 3, 4, and one said they only had 2 nipples on the back.
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