Do your self a favor and go and buy a MityVac to test the vacuum lines and various other components in the system. It takes the guess work out of finding the leaks.

The VCV is fairly easy to adjust if you have a helper. It is located on the side of the injection pump and has two vacuum lines going into the top of it. There are two 10mm bolts holding it to the IP. With the car OFF, have you helper hold the throttle pedal wide open. Then loosen the two bolts holding the VCV, then rotate the VCV clockwise until you can't move it anymore, then be sure to hold it there and tighten the two bolts. With it adjusted properly you should see around 12-14 inches of vacuum going to the transmission at idle and 0 inches of vacuum at WOT.

The best way to check the vacuum while driving is to take a vacuum line that can reach into the cabin from the engine bay and "T" it into the line going to the transmission and hook the other end to your MityVac or other vacuum gauge and watch it as you drive.

By the way, there is a lot of information on this subject around the forum.

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1998 E320 Wagon

1992 300D 2.5 TURBO

1991 560SEL M119.960

1986 300SDL TURBO

1992 500SL Parts Car

1991 420SEL Parts Car