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Final answer:
When a spark plug malfunctions in a heat engine, it disrupts combustion and gas expansion. High compression ratios in an Otto-cycle engine can lead to premature ignition.
Explanation:
When the spark plug on a heat engine is not functioning properly, it impairs the ignition process, leading to combustion and subsequent gas expansion not occurring as intended. In an Otto-cycle engine, high compression ratios can cause the gas mixture to ignite prematurely, resulting in undesirable effects like pinging.
Learn more about Internal Combustion Engines here:
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