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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 04-01-2010, 10:26 AM   #1 (permalink)
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02 540i - CEL Flashing and car stutters

Every time I have to give a decent amount of gas to pass or merge the car stutter or misfires and the check engine light comes on blinking. It happened a few times and the CEL would stay on for a while and later go off.
Yesterday it happened again but this time the CEL stayed on and every time I hit the gas pedal the CEL starts flashing. I called my mechanic and he said "You must have dropped a coil". What does that mean? What is this related to? Does anyone have any idea how much this is going to cost? I just replaced the alternator not even a week ago and now this started happening just a few days later. Are they related at all? Is my mechanic ripping me off? HELP!! Thanks in advance!
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Old 04-01-2010, 10:33 AM   #2 (permalink)
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Dropping a coil means that one of your ignition coils or the coil pack is no longer functioning. This means that a spark plug attached to this particular coil is not firing which could potentially be causing a misfire. This could be determined by looking at the fault codes. The OBC will identify which cylinder is misfiring.

I don't believe the alternator has anything to do with the ignition coils. Depending on the amount of miles on your 540i, the ignition coils are likely worn out and might need replacing. If the ignition coils are in fact the issue rest assured it's a simple fix and you can even do it yourself easily.
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