[W126 Coupe] Cold Start Valve & Engine Temp Sensor Question

[Dick Spellman]

My SEC is soon to be tucked away for the winter.  Which brings me to an interesting situation on one of the 126 chassis 300SE (1990).  I have the engine at operating temp, I have the cold start valve set-up with fuel line and electrics in a clear glass jar.  I crank the engine and see the valve spewing fuel and remember now the engine is at operating temp (80 C or so).  The cold start valve does not leak at all with fuel line pressure and a 30 minute visual check.

Is there a timer circuit in line somewhere that shuts this valve off after say 10 or 15 seconds or is it solely dependent on the engine temp sensor going 'open' at a prescribed temp???  What is the prescribed temp as the CD instructions are ambiguous?  If there is a timer, what component manages it?  What would a constant cold star valve operation do to gas mileage and possibly dilution of oil?  This engine runs smooth and does not demonstrate any issues other than a 2 time use of ignition switch to start when hot.

I'd appreciate anyone who can shed light on this subject.

Many thanks,

Dick 

BTW: the engine temp sensor I have tested I am assuming is 'no good' and is a 4 pin unit at the back of the intake manifold with readings of closed (NC) on the diagonal pins when engine is both hot and cold.  I tested this identical sender unit on my parts car (which still runs) and found that at some point these diagonal pins do go 'open'. 

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