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Which condition causes a coil on plug boot to fail?

  • A.Oil in the plug well from a leaking cam cover gasket
  • B.Water ingress from the exterior, which is prevented by the seal at the top of the well and therefore cannot occur
  • C.Cold weather
  • D.Vibration, which cracks the boot over time and therefore permits the spark to track to the wall of the plug well

Answer: A

Oil attacks the rubber and provides a tracking path to earth, which produces a misfire on that cylinder. Vibration and age genuinely crack boots as well, which makes the last option a real failure mechanism of the same part. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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