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)
My cousin just bought yesterday morning a 528i/5 after hearing everything I had to say about bimmers, and loves it. Tonight he decided to do 0-60 as fast as he dared for the first time without launching (he's a very conservative driver). Never got past 5500 rpms in each gear. After doing this, he said the engine started running rough immediately, perhaps misfiring, at all rpms. Pulled over, and the idle was irregular and varied from 300-1000. He turned off the car, called me, popped the hood, and couldn't find anything wrong. Started the car back up again and the engine ran fine, no roughness at all. Any ideas what might have happened here?
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