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Home >> BMW >> 2013 >> X5 35d >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Functional Description - Engine Performance & Emissions - Except Diesel >> Engine Performance & Emissions, Gasoline Engine - Functional Description >> Knock control >> System functions >> Spontaneous ignition

Spontaneous ignition

Spontaneous ignition is an unwanted ignition. The mixture is ignited by glowing parts in the combustion chamber before the electrical ignition. Spontaneous ignition can occur on engine with direct fuel injection.