Quick Answer White spark plugs typically indicate an excessively lean air-fuel mixture in an engine, meaning there…
lean mixture
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A **lean mixture** refers to an air-fuel ratio in an internal combustion engine where there is more air and less fuel than the stoichiometric ratio. This type of mixture improves fuel efficiency and reduces emissions but can lead to higher combustion temperatures. Lean mixtures are commonly used in modern engines with advanced fuel management systems to optimize performance and meet environmental standards.