So I am still working on getting the 240D ready for the road and have managed to get a lot of work done, but the one thing that is really starting to bug me is that I can't shut it off with the key. Doing some vacuum diagnostics, I traced this back to the ignition vacuum valve - err, I think so anyway.
If I hook up the MityVac to the brown w/purple stripe vac line (goes to the fuel shot off valve) I can shut it down easy (~6"). It also seems as if I can get good vaccum from the pump side - well, after I removed some other lines and teed the brown vac line right into the main vac line (apparently there are some other issues in other lines -locks not working properly either - but I am bypassing that for now). So this get me back to the ignition vacuum valve (IVV - if you will).
So I pulled the instrument panel out and I am looking down onto the ignition. There's the IVV sticking out from the side with its two prongs to hook the vac lines to. With the car on and running I can hook the MityVac up to the first prong (nearest the ignition) and put my thumb over the outer prong. Trying to pull vac in this configuration produces nothing. However, if I put the Mityvac on the outer prong I can pull strong vacuum that doesn't leak down (without having to cover the other prong). I am assuming then that the line from the pump (brown vac line) goes on the outer prong and the line to the fuel shut off (brown w/ purple line) goes on the inner prong - although that is the reverse of how I found it - so, did someone else mess with this???
Okay, this is where it gets weird. With the MityVac on the outer prong and car running, I pump up a strong vacuum. When I turn the key to off that vacuum releases - presumably sucks air through the other prong (which in theory I should be able to hook the line to the fuel shut off valve to and it will shut the engine off - right?) I can confirm that this is so because I can put my thumb over the inner prong, turn the key to off and feel the suction on my thumb - remove my thumb and the vacuum releases. Okay - good. Now, I hook the vac line to the fuel shut off valve to that inner prong, start the car, then pull a strong vacuum with the MityVac on the outer prong. Turning the key to off should then open the valve and pull vacuum on the shut off valve (as confirmed with my thumb trial) - no dice - I get nothing when I turn the key to off. HOWEVER, if I pump the MityVac even once at this point it shuts the engine down. What????
Your thought please.