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Which of the following is LEAST likely to result in a rich air fuel ratio? A. A leaking fuel injector. B. A faulty fuel pressure regulator. C. A faulty ECT engine coolant temperature sensor. D. A stuck
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Which of the following is LEAST likely to result in a rich air fuel ratio?

A. A leaking fuel injector.
B. A faulty fuel pressure regulator.
C. A faulty ECT engine coolant temperature sensor.
D. A stuck closed thermostat.

User Snezana
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8.1k points

1 Answer

7 votes

Final answer:

A faulty ECT engine coolant temperature sensor is least likely to result in a rich air fuel ratio.

Step-by-step explanation:

The correct answer is C. A faulty ECT engine coolant temperature sensor. The air fuel ratio in a car engine is regulated by the engine control unit (ECU) based on input from various sensors. The ECT sensor measures the temperature of the engine coolant and provides this information to the ECU. In a rich air fuel ratio, there is more fuel relative to the amount of air in the mixture. A faulty ECT sensor may provide inaccurate temperature readings to the ECU, causing it to adjust the fuel injection incorrectly and result in a leaner air fuel ratio rather than a rich one.

User Rbacarin
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8.3k points
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