Question about 2002 BMW 330i

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My car is misfiring what could be causing this problem and how do you fix it

Sometimes the car runs good and sometimes the misfiring is more noticeable.

Posted by hugo on


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Probably a coil or the connector that goes from the coil to the spark plug.. unplug one coil wire at a time and listen for RPM loss.. The cylinder with the least RPM drop off could be your problem. Change that coil to another cylinder .. see if the problem travels with it.. if it does you have found the problem..Remove the coils and check the connectors for cracks and carbon tracking.. if it does not travel check the spark plug. This is a large problem.. missing cylinders leads to bad cats.. a very very expensive problem.
Look to for parts.

Posted on Jul 02, 2014


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