Well here I am back again after spending quite a bit of time and experimentation tweaking the vac system on the 300TD and still dont have a satifactory result, I am starting to wonder if my VCV could be at fault, roughly how much vacuum should the VCV be bleeding off, Mine as Brian pointed out is the one used on later turbo diesels and I am trying to use it on an 81 tranny, perhaps I would be better off fitting the plastic type from the earlier models, Is it right that these are adjustable to increase/decrease the amount of bleed, could anyone furnish me with a part number for this valve? thanks

Felix