Ignition Coils Failed - 97 540i - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 12-18-2004, 05:31 PM
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On my 97 6 of the 8 coils are thought to be failing (misfires, throws out codes etc, extremely rough in cold) How/why is this happening? Is this a common problem???

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#2 (permalink) Old 12-18-2004, 08:18 PM
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Hey Matt,
i know youve posted a few times on the misfiring issues on your car. So is this the ultimate cause? The coils? Are you certain? If so then its not unheard of to have several go bad. I wouldnt say its real common on your year and model though. The newer Bremi coils on the later model cars are failing left and right and coil failures are not unheard of across all models but on your car id say 6 bad coils isnt common. This is why I ask are you certain that they truely failed? More common what causes misfire faults on your model is Failed Cats and Intake leaks/PCV plate failure. Hey anything is possible though of course, let us know if this is the final verdict or if the problem comes back.

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#3 (permalink) Old 12-18-2004, 08:20 PM
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While odd in terms of numbers- 6 out of 8- but it all depends on how many miles/how old these coils are. When did you change them last? through out check engine codes? what are they?
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