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Which fault does a coil that works when cold but fails when hot indicate?

  • A.A failing crankshaft sensor, whose signal becomes intermittent as the engine reaches its operating temperature
  • B.An internal insulation breakdown that opens with heat
  • C.A poor connection at the primary terminal, which expands when hot and therefore restores the circuit as it warms
  • D.A worn plug

Answer: B

Heat related coil failure is common and a meter test when cold shows nothing wrong. Crankshaft sensors genuinely fail in exactly the same heat related way, which makes the last option a real alternative worth excluding. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist.

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