I have a 82, 240D and have a problem with transmission downshifting when pulling out into traffice when the accelerator while pedal is pressed to the floor. My understanding is that the vacuum should go to 0 to the transmission, but this is not happening. There are two 3/2 valves which control transmission shifting. These switches are located on top of the valve cover. I don't believe that the valves were ever configured correctly before I bought the care, for I've tested this with a mity-vac. It is also possible that the valves are bad. I have been unsuccessful at finding a diagram of how the hoses to the valve are configured in reference to what is called the central plug. Any help would be appreciated.
I've taken vacuum measurements, and they are as follows:

Currently the vacuum pump has 23 HG measured off the brake booster line supply line going to the 3/2 valves.
23 HG on the vacuum supply at the 3/2 switch which controls the transmission.
0 HG at the top of the VCV valve and
0 on the hose going to the transmission.

Upon moving the accelerator and observing the gauges readings, it did not change between idle and full throttle.

The engine does not have an EGR valve so port 3 of the central plug is plugged off. From research found on this site, when the pedal is depressed to the floor, the vacuum should go to 0 which will down shift the transmission.

Any help would be appreciated.
Greg

How do the 3/2 valves cause vacuum to bleed off. Does the air bleed off at the valves or does it trigger the VCV to bleed air ?