Hello,

I have a problem in my 1975 W115 300d and I couldn't find any schematics of the vacuum system of my car in the internet.
It was a manual gearbox and I installed the automatic gearbox, and also the Injection pump for the automatic transmission cars.

The problem is my auto gear box is always at 1st gear, and VCV valve on the injection pump is working ok since the pump was all tested on the bench.
I tested everything and there is no leaks.

Any one can help me trying to figure out what could be the problem, if is vacuum related or anything else?

PS: Just wondering how many vacuum the vacuum pump needs to produce?

Thanks