Discussion
Which condition does a white blistered plug insulator indicate?
Answer: B
Blistering and a chalky white appearance mean the tip has run too hot, from lean mixture, overadvanced timing or the wrong heat range. Coolant genuinely does leave white deposits, which makes the last option a real if different diagnosis. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first.
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