The black piece fitted on the side of the FD is the EHA, the Electrohydraulic Actuator. Its function is to control the mixture adaptation of: (1) start enrichment; (2) post-start enrichment; (3) warming-up; (4) acceleration enrichment; (5) full load enrichment; (6) decel fuel shutoff; and (7) Lambda control. Pretty much everything involving proper fuel management.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't