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ZCAR.COM Vendor
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The cols start valve is located right on top of the standard 280z throttle body in the middle of the housing. It's held in by 2 bolts, has a fuel line attached to it and a 2 prong electrical connector. It is essentially an extra fuel injector that adds extra fuel to the intake system of the fuel to help it run while cold, so it get's to operating temperature quicker. It is controlled by the Thermo Time switch in the Thermostat housing and relies on the Water temp sensor and switch in the thermostat housing to be operating properly and accurately as well.

I've attached a picture for reference.
 

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ZCAR.COM Vendor
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Is there a fuel line connected to the cold start valve? I did not see the cold start valve in your included pictures.

The 2 prong connector could be for a number of things. Where does the wiring lead to from that connector?
 
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