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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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, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).

Sold: E-class, 320CDI, W210, 2000, 225 000km