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Which strategy heats the catalyst quickly after a cold start?

  • A.Retarded ignition combined with a slightly lean mixture, which raises the exhaust temperature and provides oxygen
  • B.Retarded ignition with a raised idle speed
  • C.Advanced ignition, which raises the combustion temperature and therefore heats the exhaust more rapidly than normal
  • D.A rich mixture only

Answer: B

Retarding the spark pushes combustion later so more heat leaves with the exhaust. Some strategies genuinely add a slightly lean or split injection component, which makes the last option a real refinement of the same approach. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

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