Fuel Trim Is Being Discussed

Fuel trim is being discussed. Technician A says a positive fuel-trim value means the PCM detects a lean mixture and is increasing the pulse width to add more fuel to the mixture. Technician B says LTFT [long-term fuel trim] is erased when the ignition is turned off. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Correct Answer:

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