330i whistle 2500rpm to 3200rpm
I drive a 2001 e46 330i with 200 000km on the clock. About a year ago this whistle started but only on heavy acceleration up a hill, but 3 months ago it started to happen more often. The whistle is normally from 2500 rpm to 3200 rpm in all gears, but again only under heavy engine load. The noise gets quite loud if a provoke it but stops abruptly at exactly 3200 rpm every time.
I have replaced both tentioner pulleys and the idler pulley and both drive belts. But the sound is exactly the same.
Please see the video in the link. (sorry for the shoddy camera work)
Please if anybody can identify the noise please post your suspicions and advice._a_