Hi duke2.6

just had time this week end to make measurements engine idling

At intake manifold vacuum is 400 mm ( 16 psi) measured on vaccum line at electronic ignition module (after throttle butterfly).

At regeneration valve line ( before throttle butterfky ) between 0 and 50mm (2psi), difficult to measure.

Is this OK?

I am looking for the method to adjust the butterfly stop (I believe a vaccum method could work) unless some body can help with a better one.

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Keep us posted especially if your problem is solved
Present cars:
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, 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