gas smell coming from crankcase.

1999 BMW M3
6 CYL • 2WD • MANUAL
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MERWIN MOORE
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Hi there, I noticed that my oil has the faint smell of gas when I open the oil cap. There is also a noticeable amount of white looking vapor that comes out when the cap is off. The car is a 99 bmw m3, with a new engine that has about 65k miles on it. What could be the cause of this?
Aug 19, 2011 at 8:50 AM
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KHLOW2008
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If the enggine is not running smoothly, you could have a misfiring cylinder due to a fault with the sparks/ignition or one of the fuel injector could be stuck and dumping fuel into the cylinder which them passes into the crankcase.
Aug 19, 2011 at 12:51 PM
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MERWIN MOORE
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Well the car appears to be running well. The motor was replaced about 9k miles ago with a newish one that had only 60k on it. I just recently replaced the 02 sensors as well. So would the fuel injector be the better place to start looking?
Aug 19, 2011 at 3:12 PM
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KHLOW2008
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Yes, you should be checking the spark plug to see if any is fouled due to excessive fuel.
Aug 19, 2011 at 3:31 PM
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DOCHAGERTY
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Any news on this issue?
Oct 20, 2011 at 2:32 PM