Vac line - where does it go?

[madjeff]

I'm currently trying to track down what I am pretty sure is a vacuum leak and have a question since I can't seem to find it on RealOEM or BMWFans.info.

http://static.bmwfans.info/images/epc/NzIyX3A=.png (http://bmwfans.info/original/E34/Lim/525i-M50/USA/L/A/1991/10/mg-11/ill-11_1284/)


My first question is where does the #5 hose run to? Mine just ends and is not connected to anything, and the end is brittle and looks like it broke off. I looked under the intake to see if I could find a corresponding broken end, but I don't see anything.

Is this thing supposed to terminate somewhere? In looking around for a possible connection I noticed that there is a hose coming off the back of the intake manifold directly behind the throttle body, and it looks like there is a small vac hose or plu coming off of it. However, I can't seem to find the corresponding diagram that shows this part. Could the #5 hose plug into this, and mine has just broke off at both ends?

http://static.bmwfans.info/images/epc/MTc5NDFfcA==.png (http://bmwfans.info/original/E34/Lim/525i-M50/USA/L/A/1991/10/mg-11/ill-11_1124/)

The hose is directly opposite of the throttle body and underneath the intake runners, but it's not shown on the diagram.

BTW, this is on an M50, 10/91 prod date. Any insight would be greatly appreciated. ;)

[madjeff]

Quick update:

After some acrobatics and the use of a flashlight I got a better idea of what the other hose/nipple is:

http://static.bmwfans.info/images/epc/MjA1Ml9w.png (http://bmwfans.info/original/E34/Lim/525i-M50/USA/L/A/1992/10/mg-13/ill-13_0381/)

The nipple comes off the upper ICV hose #8 where it goes into the backside of the intake. The above diagram is really misleading... =)

Also, after digging around the engine some more I found another piece of the broken hose, about 6" long and sitting on the block. Still not long enough to go from the crankcase ventilation connector (#1) to the nipple on the upper ICV hose, but as brittle as the hose is it could have broke into multiple pieces.

[whiskychaser]

Hose 5 in pic 1 goes to nipple on item 9 in pic 2.