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Pete

Misfire cylinder 3

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2002 320i has misfire and losing a cylinder intermittently , could be driving along normally and it would do it, if i turn the engine off and restart it , its back to normal, according to my diagnostic device which is a dedicated BMW one it's  misfire in number 3 cylinder when it occurs, it's been in the garage and they replaced the spark plugs which i knew wouldn't be the cause and gave it back to me, of course it started again so took it back, they couldn't replicate the issue so they replaced the coil; with a demo one to try it out but the problem is back after a few hours, it has me stumped and hoping one of you BMW experts may be able to help or suggest something, any help would be greatly appreciated

 

 

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Can we safely rule out that it is not a coil pack issue? The demo one you tried could it be a dud?

You can easily swap coil packs around each cylinder etc and see if the misfiring moves with the coil. 

 

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^^^^ This. Or it may not infact be a coil issue but instead a vacuum leak causing cyl 3 misfire

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