RotorJoe

http://img78.photobucket.com/albums/v291/x605p747R1/

Could someone help me figure out where this vacuum tube is suppose to hook up to. One end comes from the UIM after the TB. It then goes to a T-fitting and down to the front rotor. It plugs in right under a fuel injector, I think. The other end is the one in question and right now I have it zip tied off. With it open the idle would increase by 200rpms in every setting, No ELD, ELD on, and A/C on.

Thanks for the help posting pics (sonny and xstransam)
Thanks for the help in advance in finding out where this goes.

Mahjik

iTrader: (1)

The 4 lines in front (if I remember correctly) are:

1. PCV from oil filler neck
2. Purge Control solenoid
3. Double Throttle solenoid
4. Charge control/vacuum chamber

Have you check the vacuum diagram?

http://www.scuderiaciriani.com/rx7/v...e_diagram2.jpg

RotorJoe

Yes I have. I have even looked at the simplified one. I found a hose on the diagram that looks like it is plugged into the engine (same location as mine) and it goes to a pressurized side of the intake (just like mine), but then after that it does not go anywhere else (I am talking about one of the yellow colored vacuum lines on the diagram from the pressurized side of the twins). On mine I have a T-fitting with a hose going somewhere. The other hoses that stood out to me are linking back into a solenoid that I don't have. This is the blue ones coming out of the engine, front and rear rotor, and then go to the rats nest and then from there to the unpressurized side of the intake.

Mahjik

iTrader: (1)

Ok, that's what I'm saying, none of the 4 lines in front of the UIM go to where you are looking. They go the 4 places I listed above.

If the line goes to a solenoid that has been removed and isn't going to be replaced, you need to cap/remove the line.


I can't tell from your picture, which port it's coming out of from the UIM, but using the number above:

3-2
1-4

That's what the ports should map to on the UIM.

BigIslandSevens

iTrader: (4)

Are those the oil injector lines just taking vaccum off of the UIM? Looks that way to me. They should be hooked up to the intake elbow on the primary turbo so they see constant vaccum.( If that's what they are)

Kinda hard to tell with your UIM still on in the pics.
But that is my guess.

RotorJoe

Ok, I went back and looked at everything again with better light. I was able to see the four nipples on the UIM your talking about. Three are used and one is capped off. I was able to follow one vacuum tube from the UIM to the check valve then to the catch tank then to another hose on the engine, which I am assuming it goes to the charcoal canister (stopped following it). Then I went t back to the UIM and followed the next vacuum hose. That one went from the UIM to the PCV valve to the pressure regulator on the oil filler neck. I have always had my double throttle control unhooked, came like that when I bought it. So I think that is why one nipple on the UIM was capped. The last one is still the one I am talking about. I follow that one to the t-fitting then down to the engine. It looks like the yellow vacuum tube (from the diagram) that leads to the pressurized side of the manifold (diagram shows it leading to the piping right after the turbos), then from there to ????. Right now I have it capped off and the car runs fine. I have good vacuum at idle (looks normal) and the idle is solid now that I went through the relearn process on the PFC. I am starting to think that it should be capped off and stay that way. Since it sees manifold pressure, on one of my hard runs (boost at 1.3 bar, hit this while I was setting up boost controller, not where I boost everyday) maybe I blew off the screw that the builder used to cap off that line??? I don’t know just a thought. More input/suggestions would be helpful.

Thanks

RotorJoe

More detail please

Mahjik

iTrader: (1)

Are you non-seq or single turbo? If so, the other line is for the Charge control/vacuum chamber as I said above which wouldn't be needed in this case.

Mahjik

iTrader: (1)

Let me clarify that.... It should not be going to the UIM.

RotorJoe

Non-seq

Mahjik

iTrader: (1)

So that remaining line to the UIM (since the double throttle is already capped, you have the PCV and the Purge Control Solenoid lines already there) is for the charge control which you aren't using. Those are the only lines that should go to the front of the UIM.

Just look at the diagram. It shows you everything you need to know. The blue lines on the diagram that you are referring to do not connect to the UIM.

RotorJoe

Ok so I think we have determined that the hose in question does not go back into the UIM. The black end comes off the UIM then to the T-fitting to (I think the yellow line in the diagram). And that would make since because from the diagram that is connected to the intake after the turbo. But I still do not know where to plug the 3rd end (the end off the T-fitting that I show zip tied). This tube in question sees manifold pressure and I guess the question is what else needs to be see manifold pressure too. Again looking at the diagram to see if something jumps out at me.

Sorry, The diagram is a little confussing because I have the rats nest removed. Also the car was modified like this when I bought it so many things are still new to me.


Thanks again for the help.

RotorJoe

I agree the charge control system is not hooded up. Those vacuum tubes are all open or capped coming off the turbos.

I am now looking at my pressure camber and if that is connected right. I will look into that one.

Mahjik

iTrader: (1)

Take a look at this diagram:

http://plaza.ufl.edu/yanni25/mynonseqsetup.jpg

That's basically what you need for non-seq.

RotorJoe

Thanks, When I go home I will look at this again. I can tell you right now that I don't think the orange vacuum lines are hooked up.