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Home >> BMW >> 1990 >> 325is Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/O Codes >> Symptoms >> Knocking

Engine Controls - Tests W/O Codes: Symptoms: Knocking

Check Motronic Control Unit (MCU).
Check ignition and coil circuit.
Ensure spark plugs fire.
Check ignition and coil circuit.

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