2001 Bmw 320i Car Makes Low Blowing Noise Intermitently Whilst Driving Revs Drop

2001 BMW 320I
100,000 MILES
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my car makes a low blowing noise intermitently whilst driving and the revs drop when the noise occurs
Jan 3, 2013 at 3:48 PM
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DOCHAGERTY
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  • ASE Certified Mechanic
VANOS, cyclone separator, the list for what might be the source is very long, lets narrow the search. Is the check engine light on? Has the live data been investigated? What are the fuel trim numbers?
Jan 5, 2013 at 5:25 PM
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