Question about 1999 BMW 323 Series

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323i bmw problem

Hi i have an s reg bmw323i every time i start the car from cold there is a lound knocking sound which seems to be coming from the top of the engine but doesn`t last long enough to determine where it is coming from. also at the same time the revs are going up and down untill it becomes warm. please could you help me with this. thanks very much. chris

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  • stuartcollin Mar 15, 2009

    i have a bmw 323 2.5l 1999e46 it knocks from cold sounds like its comming from underneath the chain cover the revs go up and down aswell until warm anyone got any ideas


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An oil change won't do much.

You have failing VANOS seals. Relay this to your mechanic, and they should know what to do.

Posted on Jul 30, 2008

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Try an engine oil flush and a oil change

Posted on May 23, 2008

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