anvini

Hi guys

I have just buy a Cold Start Termo-time switch sensor on Ebay and I need to know how to test it and see if it work properly before fit it on the inlet manifold.....
I tried with a voltage tester between the 2 pins of the conector and THERE IS voltage signal continuity between them....Is it normal or seems to be broken??



CheeRS

anvini

I found this info in the web about the Termo-time switch:

""""The thermo-time switch consists of a contact to ground for the cold start valve and a bimetallic strip surrounded by a heater winding. When the engine is cold and the key is turned to "start," the bimetallic strip contacts the ground contact and allows the cold start injector to inject fuel. When the key is turned to "on," that powers the heating element inside the thermo-time switch. As the heater warms the bimetallic strip, it eventually bends away and stops grounding the cold start valve.

This all happens in 10 seconds or less. This is to keep the cold start valve from injecting too much fuel and flooding the engine. So if the engine doesn't start within the 10 seconds, the thermo-time switch will shut off the cold start valve to keep the engine from flooding for future starting attempts. When the engine is already hot, the contact in the thermo-time switch is open, preventing the cold start valve from operating. A stuck closed thermo-time switch could allow the cold start valve to operate too long during starting, causing engine flooding (but regardless, the cold start valve will still only operate when the starter is operating). If the thermo-time switch sticks open, it could keep the cold start valve from operating and cause hard cold starting.

The thermo-time switch can be tested electrically. The temperature at which the switch activates is stamped on the switch housing. You can install a test lamp in series with the wire to the thermo-time switch, disable the ignition, and crank the starter. The lamp should light but then go out in a few seconds of cranking.

The switch can also be tested for resistance between the two terminals. It should vary with temperature, being close to zero when the switch is below the temperature marked on the housing and being infinite when the switch is warm."""""""