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Which risk does a persistent misfire present?

  • A.Damage to the spark plug, which is subjected to a higher voltage each time the mixture fails to ignite correctly
  • B.None
  • C.Damage to the ignition coil, which must produce a higher voltage in order to overcome the resistance of the plug
  • D.Catalytic converter damage from unburnt fuel

Answer: D

Unburnt fuel ignites in the catalyst and melts it, which is why the misfire lamp flashes. Coil failure genuinely follows from a persistently open circuit secondary, which makes the last option a real accompanying risk. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first.

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