The bosch book lists these as the causes of cold start issues on continous fuel injection systems:

cold start valve
fuel pump not running
air flow sensor plate rest postion incorrect
fuel pressure incorrect
coolant temp sensor or wiring faulty

http://www.bentleypublishers.com/mercedesbenz/300e-4matic/Mercedes-W124-85-95-Workshop-Man.html

http://www.bentleypublishers.com/isbn/9780837603001/index.html

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)