Check post #19 again, and follow to the referenced page in the mercedes FSM. It is adjustable, and the FSM tells how in the referenced Programmed Maintenance section.
Quote:
Originally Posted by DD40AX
ALDA is a sealed emissions device. FSM says replace the entire pump if ALDA fails. Same as how EGR has an adjust screw on it but FSM dosnt say anywhere how to adjust it, they say buy new.
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