Discussion
An engine misfires under load but runs acceptably at idle, and in darkness a blue flicker is visible around one high tension lead.
Which conclusion follows?
Answer: D
Under load the plug demands more voltage and the spark takes the easier path through the damaged insulation. The visible flicker is direct evidence. A lean mixture genuinely raises the demand, which is why the fault appears only under load. The order in which the effects act is what decides the outcome, so it is worth establishing first. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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