shut off mystery.
 

Ok, I've whined about this before. the 240d won't shut off unless I open my door. However, if I park it and let it idle for a minute or two, it shuts off fine.

Or if I shut it off a few seconds right after I start it, it shuts off fine.

So, I'm guessing there's a leak in the vacuum system that's causing the vacuum to dissapate as I drive, but is somehow "recharging" after I park it.

So, what systems would be drawing on the vacuum whilst in motion? The tranny. Anything else?

I put the mityvac onto the shut off valve itself and it works fine. But I drove the car around town with the mityvac hooked up to the tube for the shut off and parked it, shut iff the ignition, jumped out and check it quick. It's pulling a strong vacuum right from the start, it doesn't build up slowly as I thought it would (because of a leak).

I have a spare shut off valve that I'll swap out as soon as the engine cools down, we'll see if that fixes it. BUt until then, any thoughts from the masters?

vacuum
 

there is a vacuum hose connected to your key and it cuts the car off..
if the vac system is not working when you turn the key off it keeps running.

if the key only works when you open you door then the vacuum line going to the door lock is being pushed back into position and making the vac system work while the door is open....then coming out while the door is closed... this is also affecting the transmission shift...

so fix the vac line in the door or cut it and plug it...

blue
 

impressive deduction...