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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