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Old 02-20-2001, 01:40 PM
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Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 1,974
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.
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)
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Old 02-20-2001, 03:02 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
It is the equivalent of a PCV valve.

Normal the intake receives a known quantity of air (and crankcase vapors) through this metered oriface. The purpose of all PCV (positive crankcase ventilation) systems is to give the blow-by gases of combustion somewhere to go other than the atmosphere. Old cars before 1968 just had a breather; usually where the oil was put in at.

Because the amount of crankcase vapors varies with speed and engine condition, the amount of metered PCV was established at a much greater volume than anticipated volume. In order that a vacuum would not be created in conditions where the meterd amount was more than the actual produced amount, there is the other hose going from the valve cover to the aircleaner. Airflow in this hose goes from the aircleaner to the crankcase and makes up the difference.

The exception is on worn out motors. In these cases the metered amount is less than the produced amount (exessive blow-by) and airflow is from the valve cover into the aircleaner. It is not a good sign to see oil in the aircleaner at this hose.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 02-21-2001, 01:33 AM
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Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 1,974
Thanks for that reply. Next question...Could I be using oil through it? I'm using a quart every 700 miles even after changing the valve guide seals.
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