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Discussion Starter #1
Hi i have a e39 540i with the m62 engine and it has stared misfiring so i changed the valve cover gasket and spark plugs as well as switched the coils around. it come up with a cylinder 8 and 5 misfire as well as random misfire code i can't seem to find what the problem is.
 

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2000 M5
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did the misfires follow the coils that you moved? If so, then you need new coils. If you just swapped the coils randomly, then I don't know why.

If the misfires are not following the coils, then you have other problems.
 

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What model year?

How many miles on the cats?

Why did you think the valve cover gasket was at fault? In any event, you should have changed both of them.
 

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Discussion Starter #8
What model year?

How many miles on the cats?

Why did you think the valve cover gasket was at fault? In any event, you should have changed both of them.
1998 with about 260,0000 km on the car and i don't believe the cat a been changed and because there was a lot of oil around the spark plugs
 
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