Where is the thermo time switch located - 1983 Nissan 280ZX

On thermostat housing there are three compmnents. One has a yellow wire going to it. That is the coolant temperature sending unit for the temperature guage. The second unit above it is a coolant temperature sensor which relates to the fuel injection system to tell the compueter what temperature the coolant is. The third switch is the thermal time switch and is the largest of all of the switches in the housing. This feeds information to operate the cold start injector which is operated for a "very" brief period of time (or window in which the circuit to the cold start valve wil energize) and is not quite the same as a choke. Just because the engine is cold doesn't guarantee that the cold start valve is going to energize. The sensor is more like a buackup to keep the cold start valve from opening every time you turn the key. The engine temperature just insures that this will not cause an accidental occurance flooding condition. It will not operate even it you have let your car sit for hours after having driven it. Usually it takes all day unless in a very cold climate, or over night before it will operate again. The coolant has to be stone cold.