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Which action does the controller take when knock is detected?

  • A.It retards the timing for the whole engine permanently, which prevents any further detonation from occurring at all
  • B.It retards the timing for that cylinder briefly
  • C.It enriches the mixture only, which cools the charge and therefore prevents the detonation from continuing further
  • D.It stops the engine

Answer: B

Timing is retarded on the offending cylinder then advanced again gradually to find the limit. Enrichment genuinely is used as an additional measure at high load, which makes the second option a real if partial description. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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