Ive been investigating my harsh shifts on my new Wagon over the last week or so...

My initial fault was the main vac source at the brake-booster-line. This has a white tagged side-barb, which according to earlier posts is for a 0.8mm orifice. It was blocked--well, nearly. Cleared it through with some 0.6mm Mig wire, and forced some WD40 through it for good measure...

I think my VCV is not operating correctly...

I have 11 ins Hg at the outlet to the trans, but the VCV is acting more like a switch than proportional. It will go from 11" to approx 7" from Idle to full WOT.--The change in Vac. happens in a small range of VCV shaft-movement.

--Adjusting it makes no difference, apart from where in the throttle arm range the vac. change takes place...

--Is this the usual 'mode-of-failure' for a VCV...?

BTW, Been looking for a MityVac here in UK--I know they are available, Somewhere....

Had some luck finding summit similar made by Sealy..

But, they want near 300 dollars for it...

How much are you guys finding MityVac in the 'States for...?

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Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....