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For the engine hard to start when cold try this:
test fuel pressure
test coolant temperature sensor
test starting device of KE fuel injection system
For the other problem it could many things causing the rich condition. An cold engine will always run rich not lean. You will have to test the KE injection system and see what it is wrong.
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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
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