The valve allows maximum vacuum at engine idle and reduces that as the
throttle is opened until there's no vacuum at full throttle. The valve
is not repairable. Suggest the vacuum line to the valve be checked for
You may have a vacuum leak that is preventing the correct volume of vacuum
from getting to the tranny modulator. To determine this, with the engine
hodd up, stand in front and look at the vac pump. Notice the "H" shaped
vacuum fitting that the vacuum hose goes to and remove the left two hoses,
block the holes in the fitting where they plugged in and experience a huge
improvement in handling, shifting, mileage, etc. Tou can order an "F" shaped
fitting at any MB dealer. it is part #601-078-06-45. P.
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