Thanks you stevebfl,

this helps me to better understand.

I messed up the adjustment screw; and now I m trying to get back to the right setting of the stop.

Then if I understand correctly I should close as much as possible the throttle with the adjustment of the stop screw without sticking. Am I right?

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Keep us posted especially if your problem is solved
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My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class 220CDI, 2009, W204

Sold E class 260E, W124, 1988 beloved car sold after 489 000 kilometres of reliable services (engine M103, clutch and 5 speed manual gear box all original).

E-class, W210 320CDI, 2000[/B], 225 000km, Sold