I have recently replaced the little white 3/2 valve (mine only has 1) and *assuming* the new one I installed is good that hopefully isn't the problem. I have also replaced all the vacuum lines and the vacuum rubber connectors & splitters under the hood.
I tried running the car while applying vacuum directly to the line connected to the modulator with my mityvac and still no up shifting, whether there is no vacuum or if its holding vacuum with the mityvac.
Is there any way to diagnose a modulator being bad, such as if I pull it out is there something to check and verify to tell me for sure it's toast?

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1981 240D ... 265k
1977 240D ... 265k
1977 240D ... 250k