I tackled a pcv job today, also added a mbc and ipd manifold spacer. Upon start up the car shot the rpms to the max so I think I have a vacuum line hooked up wrong somewhere. I have two hoses on the intake manifold that I have no idea where they go. I know pcv takes up two lines at the very bottom and one of the lines taps from boost controller but I have two nipples open on the intake . Does anyone have a diagram or knows where all the hoses get hooked up?

Thank you

 

The variety of vacuum arrangements on 850's is really disturbing. I've got 7, and they're all different. The only reference I have ever found that actually fits the car is the sticker on the bottom side of the hood, and of course even that is not a 100% complete picture.

 

DB, my 850T is home this week, let me know if you need a picture or a specific line to trace (ie from the vacuum tree etc). I can tell you the vacuum tree on my car has two stems stubbed off with caps (one fell off a few months ago and threw a CEL...). also if you can post a pic of where you have the open ends, I can compare on my car.

 

MT, I appreciate the help. I don't need pictures but I would like to know where all the hoses get hooked up on the intake itself, between the turbo and the cleaner box

 

Ok, if you started your car and the "RPMS shot to the max" it is not a vacuum leak. Sounds more like the throttle body is open.

Here are the vacuum diagrams.





the link below is a sticker that should be under your hood.

 

DB,

To add to the diagram Boxpin posted - the actuator (#16) can be found looking down from the MAF. The yellow (yes mine actually has a yellow mark on it) goes to the waste gate, the blue goes up to the intake tube by the MAF and the green goes to the turbo.

There's also a second actuator (not on this diagram) under the cover for the throttle cable rewind which has a short L tube to the intake manifold and a long tube that goes under the distributor and rides the same path as the yellow and green down to the turbo area. I didn't get under the car or use a mirror - so I'm curious if that's the red tube (#20). These are all the larger (or medium) vacuum tube size...

 

These are the hoses in question

 

In the photo you posted, the open hole (no hose attached) is where vapors from the PCV go to. There's no vacuum there, so it's not really sucking on the PCV, but that is where it vents to. The electric thing on there is just a heater. On a lot of turbos, the vapor off the PCV snakes around on top of the engine, under the spark plug cover, and comes back out. That is also just a heater, and it's confusing if you think that tubing is supposed to go somewhere. It just goes under the spark plug cover and comes out again.

 

Other then the two of lines, I have 3 additional nipples on the air intake, 1 more at he bottom next to where the pcv lines go and two at the top near the maf. Those are the ones in question

 

Anyone?