Re: Does the 1988 750iL have PCV Valves? (archive)

The above is the Volume Control Valves (VCV). They do not have balls in them like a PCV Valve but do have a mesh screen that you can clean in solvent. They are located in the front of the engine right under each actuator. Some people call them PCV Valves but they are not the same thing as the BMW VCV does not have the ability to stop the vacuum from escaping like a PCV Valve does. All they do is limit air movement by their size.

2ea 11151715844 gasket (called adapters) $2.25

The above is the gaskets that are what the VCV plug into.

The above is also called Stop Pressure Relief Valve. This is the part that stops the vacuum from escaping like a PCV Valve does should vacuum dry up in the crankcase. There is a small hose that comes off of the VCV that plugs right into the check valve. This is a safety precaution should the VCV ever become plugged.

Dave

P.S. I did find out that 39-111-709-29 and 39-111-700-24 are the after market VCV version but not the true Bosch part. Found out the VCV are a non stocked special order part as they are rarely ever replaced.

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