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Home >> BMW >> 2008 >> 528xi Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1653 (Self Diagnosis - Theory & Operation (S85)) >> Misfire Monitoring >> Monitoring Function >> Measurement Principle

Measurement Principle

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A constant measurement voltage is applied to the spark plug immediate after the ignition spark. The chemical process of combustion produces free electrons and ions. Hence, some electrical current is flowing, which is measured and analyzed.

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