JFR

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

classicauto

iTrader: (3)

IIRC its either for the fuel pressure reg, or it goes to the nipple between the oil injectors on the LIM.

JFR

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

J-Rat

iTrader: (2)

FPR doesnt come off the throttle body, it comes off the vac rack.

JFR

Right, so do you know where the hose goes to then?

mort2002

iTrader: (1)

i thought it went to the actual oil injectors

JFR

The oil injectors use the smaller, 3.5mm hose.

mort2002

iTrader: (1)

well they all group up into a 4 to 1 connector, and that 4 to 1 connector uses the bigger vac line...

JFR

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.

JFR

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.

mort2002

iTrader: (1)

been there... done that.. multiple times

JFR

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.

JFR

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...

mort2002

iTrader: (1)

so is it right or what... that just seemed like babble...

JFR

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.

classicauto

iTrader: (3)

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

JFR

Haha, don't worry about it, there's so many little things on these cars, it's hard to keep track of everything.

JFR

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?

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

JFR

Yeah, I saw that, but I don't see the water thermowax thing with its vacuum lines. hmmm

HAILERS

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.

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.

HAILERS

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.

JFR

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.