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Gas smell coming from crankcase.

Tiny
MERWIN MOORE
  • MEMBER
  • 1999 BMW M3
  • 6 CYL
  • 2WD
  • MANUAL
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?
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Friday, August 19th, 2011 AT 8:50 AM

4 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
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.
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Friday, August 19th, 2011 AT 12:51 PM
Tiny
MERWIN MOORE
  • MEMBER
  • 2 POSTS
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?
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Friday, August 19th, 2011 AT 3:12 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,815 POSTS
Yes, you should be checking the spark plug to see if any is fouled due to excessive fuel.
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Friday, August 19th, 2011 AT 3:31 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Any news on this issue?
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Thursday, October 20th, 2011 AT 2:32 PM

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