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A plug whose tip never reaches its self cleaning temperature will do what?

  • A.Nothing
  • B.Detonation under load, which follows from the tip acting as a hot spot within the combustion chamber during firing
  • C.Fouling with carbon or oil deposits
  • D.Pre-ignition, which occurs because the tip is unable to dissipate the heat produced by the combustion process

Answer: C

A tip that never reaches its self cleaning temperature accumulates deposits and eventually shorts the spark. Pre-ignition and detonation both follow from too hot a plug, which makes those options describe the opposite error. Checking which component actually carries the load settles most questions of this kind at once. Naming what changes and what stays the same is the reliable route through questions of this shape. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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