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Knock control

Knock control


The B234 engine has a knock sensor. On the basis of information supplied by the camshaft position sensor, the control module knows which cylinder is under compression when ignition occurs.

If knocking is detected, the ignition will be retarded in the relevant cylinder in steps of 3° until the knocking stops. It will then be advanced in steps of 0.75° until knocking recurs or until the original timing is restored.