Try getting some diesel purge (2 cans) and run it off a liter bottle in the engine bay. It is possible the rack is gummed up or some other issue. Also try disconnecting the ELR on the back of the IP.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42