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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 03-02-2004, 10:52 AM   #1 (permalink)
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Help - long standing problem. My 525i Vanos engine is surging at highway speeds when under load (climbing hills). The surging is steady at a frequency of once per second. The problem occassionally, but not always, is alleviated after a tune up but invariably returns after a couple of weeks. I have replaced fuel filter and cycled a spare coil through each of the 6 positions with no obvious improvement. Is it likely that there is more than one defective coil? I welcome suggestions. Thanks.
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Old 03-04-2004, 07:14 PM   #2 (permalink)
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I would start looking towards a fuel pressure or fuel delivery issue. Quite possibly a fuel pressure regulator.
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