![]() Consequently, polluting air and waste fuel. So, a faulty (ECT) sensor that always reads cold, may cause the fuel control system to run rich. Then, the (PCM) leans out the fuel mixture, to reduce emissions and fuel consumption. But, as the engine nears normal operating temperature. This improves idle quality and prevents hesitation, while the cold engine is warming up. ![]() Then, it increases injector pulse width (on time), to create a richer fuel mixture. If the (PCM) receives a cold signal from the (ECT) sensor. Input from the engine coolant temperature (ECT) sensor, may be used, by the (PCM) for any control functions: Start up fuel enrichment, on fuel injected engines
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