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Which measurement is checked when servicing a spark plug?

  • A.The electrode gap against the specification
  • B.The resistance of the plug, which indicates whether the suppression resistor within it has failed during service
  • C.The reach
  • D.The torque to which it was previously tightened, which indicates whether it has loosened during the service period

Answer: A

Gap widens as the electrodes erode and is set with a feeler or wire gauge. Plug resistance genuinely is measurable and a failed suppressor causes misfire, which makes the second option a real if less common check. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.

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