Quote:
Originally Posted by craftysince86
if the valve is stuck open or closed and is causing it to stall wouldn't it do the same when it was in neutral?
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I missed your second sentence!
When you put car into drive, it puts an extra load on engine and rpms drop. I just went for a ride in my 350SL which has same engine. The difference between PorN and D is in the 100-150rpm range.
Let's say you set your car to idle in P at 700rpm when not fully warmed up and then go for a drive. If the AAV is sticky, once fully warmed up, your idle could drop to as low as 500rpm in P and then when you put it in D, it may drop to 400rpm (which usually means it will cut out unless you give it some gas).
As others have mentioned, there are many possibilities of what could be cause of your problem. But after owning a djet for 25+ years, I would always look first at the AAV for your symptoms.
You can try twiddling the idle knob on the ECU. Set it in middle of range (I think that is 9 clicks from either end of range?) Then try 1 click at a time either way with a burst of revs in between. This screw adjusts the idle mixture but is just a fine tuning. I think it had more to do with meeting environmental regulations than anything. You need an exhaust analyzer to set it to factory specs. But worth a try to see if affects anything.
BTW, this 107 link applies to the 4.5L Djet - might be worth reading.
http://www.benzworld.org/forums/r-c107-sl-slc-class/1600137-comprehensive-illustrated-djet-72-75-350-a.html