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Which waveform feature indicates a fouled plug?

  • A.No spark line
  • B.A shortened burn time, which follows from the deposits conducting away part of the energy of the spark itself
  • C.A low firing voltage with a long burn time
  • D.A high firing voltage, which indicates that the deposits are resisting the passage of the spark across the gap

Answer: C

Deposits provide an easier path so the voltage needed is low, and the remaining energy sustains a long burn. It is the opposite pattern to a worn plug, which is precisely what makes the measurement useful. Checking which component actually carries the load settles most questions of this kind at once. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming what changes and what stays the same is the reliable route through questions of this shape.

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