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Back fire my 1995 model 520i is backfiring. what is the problem and how can i fix it

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Hi Thomas, The problem could be related to burned valves, a leakage on the intake manifold, a defective airflow sensor, or a number of other problems. First disconnect the airflow sensor and start the vehicle and determine if the backfire is still there. If it behaves then that unit is defective. I suggest you have a diagnostic scan carried out to determine what is causing the problem on your BMW. Regards John

Posted on Jul 20, 2013

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