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Which component distributes the spark to each cylinder in an older system?

  • A.The coil, which is switched in turn to each of the plugs by the control unit according to the firing order
  • B.The spark plug lead
  • C.The contact breaker, which opens once for each cylinder and therefore directs the spark to the correct plug in turn
  • D.The distributor rotor and cap

Answer: D

The rotor sweeps past the cap segments, delivering the high voltage to each lead in the firing order. The contact breaker times the spark rather than distributing it, which makes the last option confuse the two functions. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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