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Which capability does coil on plug ignition add?

  • A.Nothing
  • B.The elimination of the high tension lead, which removes a source of interference and of resistance within the circuit
  • C.Individual cylinder timing and misfire detection
  • D.A wasted spark on the exhaust stroke, which cleans the plug and therefore extends its service life considerably

Answer: C

One coil per cylinder allows the timing to be trimmed individually and simplifies misfire diagnosis. Removing the lead genuinely is a real benefit of the layout, which makes the last option a true statement of a secondary advantage. The shared behaviour explains why these belong together and the differences explain why both exist. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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