[Thassos]

Interesting thread, looking at the vaccum 'solenoid' in the pic, some of these are simple on-off type ports that either apply a vaccum to the (far side) or switch off the vaccum, usually to operate a mechanical arm or something like perhaps on a turbo the VNT vane position etc to control boost at different engine RPM, pierburg make a lot of this sort of product (found a pic attached of a similar looking part. It looks like there is a round section that is probably a stepper motor or similar that allows a progressive movement between full vaccum (or pressure if is uses pressure) or anywhere inbetween no vaccum to 100%. Suspect if you have a look at the 2 wire (12v) signal it may be a PWM type signal to set it at the desired position ? with no power, is the port open or closed? Whats on the far end of the tube (turbo?) side.