I have a 1991 190e 2.6 (W201 M103). There's two hoses coming out of the valve cover, one goes to the air cleaner, the other one goes to the head. The one going to the head I had off with the engine running and it had a lot of vacuum and the engine did not like it disconnected. My service CD doesn't show it. I was wondering what it was and what it did and why.

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5 speed '91 190E 2.6 320,000 mi. (new car, fast, smooth as silk six, couldn't find any more Peugeots)
5 speed '85 Peugeot 505 2.5l Turbo Diesel 266,000 mi. (old car, fast for a diesel, had 2 others)
5 speed '01 Jetta V6 (new wifes car, pretty quick)
5 speed '85 Peugeot 505 2.2l Turbo Gas 197,000 mi. (wifes car, faster, sadly gone just short of 200k )
5 speed '83 Yamaha 750 Maxim 14,000 mi. (fastest)
0 speed 4' x 8' 1800 lb Harbor Freight utility trailer (only as fast as what's pulling it)