Discussion
Statement I: A carbon canister purge must be scheduled carefully by the engine controller.
Statement II: An uncontrolled purge delivers a slug of fuel vapour that drives the mixture rich.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the care needed. The canister holds adsorbed fuel vapour, and purging it admits an uncontrolled quantity of fuel to the intake.
An unscheduled purge therefore drives the mixture rich, upsetting the closed loop control and the catalyst's operating window. The controller purges when conditions allow - warm engine, steady load - and trims the injection to compensate, learning the vapour concentration as it goes.
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