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Recently bought the car (2000 540i M Sport) knowing it needed some work, I am a mechanic but never worked on this motor before (M62). I am getting codes saying that it is misfiring on all cylinders (1 - 8), idles fine, drives great, has fuel and spark. I am hoping this great community can give me some advise!
 

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The M62 is not even close to the same as the S62. You might find someone here with insight to a 540, insight from the S62 will be little help likely. Also you need to post the misfire codes, there are several and they mean different things. That said try unplugging the Maf clear the codes fire it up and see if you get any missfire codes. The one thing all BMWs have in common is eventually their Mafs go bad.
 
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