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Which parameter helps distinguish an ignition misfire from a fuelling one?

  • A.Short term fuel trim behaviour on that bank
  • B.The engine coolant temperature, which rises when a cylinder is not contributing to the output of the engine
  • C.Vehicle speed
  • D.The mass air flow reading, which falls when a cylinder misfires because less air is drawn into the engine overall

Answer: A

A misfire from any cause sends oxygen to the sensor, but the pattern of trim and the response to swapping components separate the two. Air flow genuinely changes with a misfire, which makes the last option a real if ambiguous indicator. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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