Problem - my 1986 560SL won't start when cold. The colder it gets the harder - and longer - it takes. I can usually get it to start after cranking for several MINUTES!

Here's what I know after some early morning tests - it's currently 30F here and I decided to test the cold start valve. Pulled it and aimed it in a jar and it's not working - no fuel present while cranking....

Tested for voltage at the connector while cranking and I do NOT have 12 volts...

Tested the CSV directly by wiring a 12 volt source straight to the valve and when I do that the valve operates nicely - nice atomized flow of fuel present.

Clearly I have a problem getting electricity to the valve...

But, I can not find a wiring diagram for the cold start valve anywhere - I know it's connected to the coolant temp sensor, but I'm pretty sure I tested it the last time I went through this and it tested OK - but I don't know...

Any thoughts?

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE