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BMW E 46 Need help diagnosing problem

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Published on Oct 22, 2012

I just bought a 04 BMW E46 330i with the sport package from a little pot lot. It sounded alright when we got it but then it makes this noise only at idle and when I rev the engine it goes away or the noise diminishes quite a bit. Also the engine does not make the sound right at start up usually when it gets to normal operating temperature does it start making this noise.

Things I have already checked or changed

-DISA
-Idler Pulley
-tentioner pulley
-Water pump
-thermostat
-radiator flush but not the engine block flush
- changed the oil
- belts and pulley all are good
- fan clutch seems to check out fine
- I have heard it could be vanos seals but that is a different rattle from what I can hear.
- doesn't knock with acceleration so don't think it is the rod knock

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