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325is Automatic
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Engine Controls - Tests W/O Codes
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Symptoms
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Backfiring
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Engine Controls - Tests W/O Codes: Symptoms: Backfiring
Check fuel injectors.
Ensure ignition timing is correct.
Check Motronic Control Unit (MCU).
Check distributor.
Ensure spark plugs fire.
Check ignition and coil circuit.
Check exhaust system.