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2001 BMW 740iL

Question: blows blue/white smoke when u start it

Question

gtboy2, Ferndale, MI, July 08, 2009, 18:31
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 Rookie

sometimes when you start it. It will blowout blue/white smoke from the tail pipes.any ideas what it could be?

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  • Answer #1

    patrick mannion from Greg Solow's Engine Room, July 08, 2009, 22:34
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     Master

    Particularly if the car has higher mileage, as the valve guides or valve guide seals wear oil that has gathered around the top of the engine seaps down over night and on first start up causes burned oil smoke to be emitted from the tail pipe. As long as it quickly clears up and doesn't foul the spark plug causing a misfire, keep an eye on the oil level and keep your engine oil changed frequently.

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  • Answer #2

    Visitor, March 03, 2010, 14:34

    Engine vent valve on the rear of the intake manifold. Very common failure, Have a tech check this. BMW dealer has a tool to check it.

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