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the coolant temp sensor tells an on board computer (ECU) to ajust fuel mixture based on how hot or cold the engine is (hot engines require less fuel, cold engines more). if the sensor gets dirty or disconnected it will flood the engine with fuel and cause the car to run very poorly or not at all.

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Q: What does the water temp sensor do on a 77 280z?
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Where is the temp sensor located on a 77 Datsun 280z?

There are 3 temp sensors. 1 is under the spark plugs for the head cylinder temp. Another is on the thermostat housing for water temperature. And the 3rd is just beside the water temperature sensor and it's not a sensor it is a temperature switch.


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