IF you ve replaced the cold start valve take a look at some of the electronics.

Check your ovp and the warning harness to make sure thats good. It could be a faulty new cold start valve. Only way to find that out is take a know good one and put in there.

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