Discussion
Which purpose does afterglow serve?
Answer: A
Keeping the plugs energised for a minute or two after a cold start stabilises combustion and cuts the white smoke. Emissions legislation drove its adoption. Stalling is a real risk on a very cold engine, which makes the second option partly true. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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