After conducting the tests on both air and water temperature sensors, we found that both sensors are the negative temperature co-efficient type (NTC). This means that as temperature goes up, resistance goes down, which means more current can flow and a stronger signal generated. The battery was going flat in the infra-red thermometer and readings started to go all over the place, but we got enough accurate readings to get suitable results. As resistance in thermistors decreases, the signal going to the ECU gets stronger, so the ECU can tell when the engine warms up. If the sensor is faulty, it will not give the correct reading and will tend to make the engine run rich, which will make it run rough.
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