If a vehicle designed for premium-grade fuel has been filled with regular-grade gasoline, the engine sensor allows the PCM to compensate for the lower octane of the regular gasoline is: "the Knock Sensor" (Option B)
Premium gasoline has a higher octane rating and is often used in high-performance engines. A higher octane number indicates that the gasoline is more balanced and buffered against spontaneous combustion, which can cause engine knocking and vehicle damage.
The knock sensor detects the high-frequency engine vibrations associated with knocking and sends a signal to the ECU. The goal is to maximize energy yield by beginning ignition as soon as feasible. Engines equipped with a knock sensor can save gasoline while increasing torque.
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Full Question:
A vehicle designed for premium-grade fuel has been filled with regular-grade gasoline. What engine sensor allows the PCM to compensate for the lower octane of regular gasoline?
A) Octane sensor
B) Knock sensor
C) Crank sensor
D) Fuel sensor
