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-   -   Cylinder head valve thickening turns knocking after 2500rpm (http://www.bimmerfest.com/forums/showthread.php?t=661074)

///fast5 11-28-2012 06:44 PM

Cylinder head valve thickening turns knocking after 2500rpm
 
i was riding my m5 from work back to home. stopped at mcdonalds and start hearing valve thicking noise and after got on the road with accelleration thicking is going away than knocking starts. what the hack is that!!! any idea? no codes at this moment...

my oil level was good used valvoline vr1 10w-50 recently changed. no leak coolant good. what could happen? i drive my car high rpm. but thats what made for!!! i like pitchin back of my tailpipe.:) help:cry:

ard 12-02-2012 01:09 PM

I'd be concerned with bearing noise. DO NOT drive it until you get a proper diagnosis...you might change the oil and look at it....

M5board dot com... Search for rod and main bering posts ...

ard 12-02-2012 05:19 PM

I'll add, you when from a "ticking" sound, to a "knocking" sound?? Not sure you've spelled it twice wrong...

I'd park that car and not turn the key begore diagnosis.


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