The cold start valve on my Bimmer is just an extra injector that adds additional fuel to the engine during the cranking of a cold engine. I believe it serves the same function on the Benz.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record