Just went out to try unplugging the modulator altogether, upshifts are a bit firmer as if there is no cushion, downshifts appear the same.

As another sort of test, plugged the black vacuum line (which goes to the box via Y shaped pump fitting) directly into pump, this made a big difference, all shifts pretty much normal.

Wondering if its just lacking vacuum due a crack or something, plugging into pump direct help boost vacuum?

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)