Juan

iTrader: (28)

So I'm removing all these vacuum lines on my s4 TII and I'm using Scott 89t2's vacuum diagram (series5 TII) when I notice that the switching actuator is not on the diagram.

Where do I hook this up to? My intake manifold has 3 plugs on the rear of it and his diagram shows 4 plugs (don't know if this matters). Is there a diagram for series4 TII's somewhere?


THANKS!

NZConvertible

Doesn't anybody use the FSM?!

By switching actuator, do you mean the twin-scroll actuator? Put the vac rack back in place, follow the hoses and see where it hooked up to. This is what you should've done this before you pulled everything apart...

HAILERS

The twin-scroll solenoid was the Green one (green dot). It should have been the front solenoid. It needs vacuum going to it. Blow smoke into the output pipe that went to it and see where the smoke comes out. The smoke should come out a gang of four metal nipples at the back/right side of the engine. the one for the twin-scroll more or less points towards the right side of the engine while other three curve more or less upwards. From there it goes to the switching actuator via long metal pipe. There is a vac hose (short) to connect the two. No good pictures available.


HEY! I USE THE FSM. It makes a good coaster for a mug of beer while I work. The spilled beer adds texture to the pages. Gives more resolution to the pictures.

Pinfield357

HAHAHA

i also use the FSM infact i fell alseep last night wihle reading it looking at vac diagrams cause i have a vac leake tha ti found but i cant cange the line without taking the IC and UIM off and i reallly dont want to

so i was just gonna cap the end of it if i could

Juan

iTrader: (28)

Thanks for the HELPFULL reply. Let me look for the "Removing Vacuum Rack & Emissions" section in the FSM.

I know where it hooked up to before I pulled all the vacuum lines out of there. According to the searches I did, nobody ever mentions this actuator in their write-ups or diagrams.

Maybe I could rephrase my question...
Can I hook it up to one of the 3 nipples on the firewall side of the UIM?

NZConvertible

Your question implied you wanted to put it back where it came from. You then asked if there's a diagram for S4 TII's. There is, in the FSM. All the info you need to work it out is in there. Sticking it back there seems a bit too obvious... The lines on those nipples aren't supposed to be removed. I presume you've removed the crankcase ventilation system with the vac rack, so use one of the nipple on the front of the UIM. Make sure you get one that sees vacuum, one of them doesn't. Don't forget the check valve either.

It makes sense to work out how these things work before you start tearing them apart, so you avoid these sort of problems. I'm not raggin' on you, just giving you some advice that'll save you grief later. .

jimmyv13

You could also remove the twin scroll in the manifold and not have to wory about the vac line or the solenoid.

wankel drwankel

huhuhuhu firewall nipples !!!!

HAILERS

Find the solenoid that has the GREEN dot on it. Connect a source of vacuum to one nipple and run a vac hose from the other nipple to the switching actuator at the turbo.

The at the rear of the intake there are four nipples all in a row (I understand only three on a 88 series four). The very bottom one is the only source of vacuum or the three/four. Use that as the source of vacuum for the solenoid (Green).

Yes, the nipple on the front of the throttle body can be used also. If the rack is gone, it might as well be used for something.

Off to work. You know, I've been thinking about work. It has armed guards with M-16's and a fence around it with barbwire. Sounds a lot like a PRISON!

Juan

iTrader: (28)

Thanks NZ and Hailers for your help

I just put the engine in the car so removing the twin scroll is not something I want to do right now. I have no problems with leaving it there for now

THANKS!

NZConvertible

You have to put the check valve back in too or it won't work! It goes between the vac source and the solenoid valve, oriented to that air can only flow away from the manifold.

HAILERS

Well, if were going into detail, the feed line to the switching actuator goes on the nipple that points straight up on the solenoid. The vac line on the nipple on the end of the solenoid.

The white part of the check valve faces the solenoid. The wire colors are black/white for one wire and the other wire is blue/black. Green connector. Details, details, details, details.