My 2000 323i is making a weird noise when i drive. It sounds like a "whumm whumm whumm whumm....." almost like a tire is out of round in the rear end. I replaced both rear wheels yesterday and had an alignment done, but no change in the noise. I can't tell where exactly the noise is coming from but it is quite noticable and annoying. help!
Wheel bearings? Diff bearings? Diff fluid level? Driveshaft u-joint? Halfshafts? cv-joint(s)? Brake-pads-contact-to-rotor issue? Guibo? Driveshaft support bearing?
I would say you probably have a bent rim. Your tires will balance with a bent rim, you will just not be able to get rid of the noise and bump. If they are original, they can be straightened. Please let me know. Jim
Does the sound change at all when you turn left or right? If it does, I would suspect a rear wheel bearing. Have you had it diagnosed yet?
