BMW 5-Series E12 (1975-1981) Ignition - Spark Plugs
Spark Plugs
Spark plugs are used to ignite the fuel-air mixture in the engine's combustion camber. New spark plugs are a must for any good tune-up. Check for abnormal pitting or charred plug ends. Also check each plug against each other. Any strange variations among plugs are a sure indicator that something is wrong with a particular cylinder.
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