Hi everyone, just wanted to continue the discussion in this thread.

http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/312740-wtb-w123-3-2-way-valves.html#post2884628

First some background info. A while ago I was having shifting problems and decided to check the vacuum modulator and it wasn't holding any vacuum so I replaced it and the new one was fine, but before adjusting it I wanted to make sure the vacuum system was healthy so I hooked up a gauge to the hose that connects to the modulator and I was only getting 3hg vaccum, I figured that wasnt right so I started looking for a leak.

I started at the vacuum pump and everything seems good a steady 22hg vacuum. Went through the diagram checking every single hose,connector and component and everything was good, 22hg all the way until I reach these vacuum valves, with the car idle the vacuum drops to 3hg, the same reading at the modulator. I took them out of the car and tested them and they don't hold any vacuum at all.

I took out the car for a drive again today and the car actually shifted into third but at what sounded like very high RPMs (dont have a tach) and at around 36mph, I didnt want to push it and try to shift into 4th since it wasn't shifting at around 52 mph...The shift from 1st into second is also very rough and at higher rpms than normal. I assume alot of that has to do with the very low (maybe non existent) vacuum to the modulator and the modulator not being adjusted yet.

Someone in the other thread suggested that I remove the egr system and these valves completely, is that possible on the automatic 240d? I was under the impression that on the automatic 82 240ds that at least one of the valves was critical to rerouting and controlling vacuum for proper transmission function, while on most w123 models they only control egr functions.