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bmw: e46 loud noise from rear axle when my car run 55 - 70mph

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Why my BMW E46 loud...
Why my BMW E46 loud noise from rear axle when my car run 55 - 70MPH? But after 80MPH and above.. noise gone...
Submitted: 5 years ago.Category: BMW
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5/21/2012
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago
Roger
Roger, BMW Master Tech
Category: BMW
Satisfied Customers: 5,895
Experience: 10 yrs. experience as BMW Master Technician, shop foreman and dealer.
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Hello,

This could be a few things but the most likely cause is a bad wheel bearing. The symptoms of a wheel bearing can vary to noise at certain speeds to noise when turning. The first thing I would recommend would be to swap your rear tires to the front to see if the noise moves. This will help rule out that this is not a tire noise issue from irregular wear on the tires or a bad belt inside the tire. If it does move to the front then the tires are the main issue.

You can try to turn tight circles and see if the noise occurs while turning in a circle. This helps to load each side and can help localize which side the wheel bearing may be bad but I have seen both go at the same time. If the noise persists then the next step will be to have it checked on a lift and using a stethoscope the wheel bearings can be checked for noise to localize if it needs one or both wheel bearings.

Please leave a short positive comment on feedback such as (ex. Thank you). This would be greatly appreciated.

Thank you.

Roger
Roger, BMW Master Tech
Category: BMW
Satisfied Customers: 5,895
Experience: 10 yrs. experience as BMW Master Technician, shop foreman and dealer.
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Customer reply replied 5 years ago
I already change my wheel bearing and all rear bushing cmplated. Before this no noise. But my mountting absober rear crack now. This effect noise?
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago
Hello,

To clarify please, are you referring to the rear shocks or the mount for the rear differential? Thank you.
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Customer reply replied 5 years ago
How about the my axle sir? Can this noise from my load axle when running car? Because if we rest pedal for 55 - 65MPH, the noise come very load, and if we relase my pedal, noise gone. My transimation is auto.
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago

Thank you for the replay back.

It is not overly common but I have seen a few drive shafts cause some noise. This occurs in two ways that I have seen. There is an inner sleeve inside the drive shaft that can detach and make a noise under load but this often sounds metallic.

The other item is the center bearing on the drive shaft. I have seen this make noise under load. This center bearing can be replaced separate than an entire drive shaft which is good. The difficulty with a problem like this is that noises in the drive train telescope in the entire system. So what often sounds like a bad differential for example is really a bad wheel bearing or drive shaft. Since the wheel bearings where replaced and replacing the center bearing may be the best step.

I have seen bad wheel bearings out of the box so keep this in the back of your head in case the noise is still present. If you raise the rear axle and drive it with it in the air you can use a long screw driver like a listening device with your ear on the handle to see if the noise is from a wheel bearing or hold the spring and feel for the vibration in the spring which is another good test. If the bearings check out good then the drive shaft would be my next step as well.

I hope this helps.

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Customer reply replied 5 years ago
Ok sir...we try you suggestion, wheel bearing out this problem because we replace few day. We try check again centre bearing because my car have small vibration.Mybe my centre bearing crack. But.. centre bearing put location in the centre from car body, why noise come from botom rear my car sir? I have jack and try running car for high milige, but my car not running because my ABS functional and break my whell. So how we try to running my car if we stand jack?
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago

The noise often can travel (telescope) through the drive train. This is very common and makes noise locating difficult when looking into a noise like this. It would travel down the driveshaft and possibly even into the rear differential. The same is for bad wheel bearings.

To check this in the air, press and hold the DSC button in the vehicle while the car is running. This will disable DSC and allow it to be checked while lifted. This may set wheel speed sensor faults that will need to be then cleared out of the DSC/ABS unit with a scan tool.

I hope this helps! :)

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Customer reply replied 5 years ago
Ok sir... try to slove. Thanks for answer.. we ask later or give fadeback my car. First we check my centre bearing because we completed recheck my wheel and axle oil no problem.
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago
Thank you :)
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Customer reply replied 5 years ago
Hello sir... why my car BMW E46 down power when we press pedal running after stop in junction.
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago

Hello,

 

I hope you have been well :)

Do you have any check engine light on or any warning lights coming on? Do you hear any noises during acceleration? Can you explain the first time you noticed this and any other symptoms you have?

 

Thank you.

Kind Regards,

Roger

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Customer reply replied 5 years ago
No any indicator light, still normal. But when i rest padel for 20mph, have noise air. I dot know why but the noise air come from slincer. And when we stop my car, we try paster running and rest pedal, but my car not running and engine down but not stop. We relase pedal and rest slow for running car.
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago

Thank for the information. This may be an unmetered air leak, a problem with the DISA flap or clogged air filter to name a few items.

 

The first thing to check is the throttle boot near the elbow that goes to the idle air control valve. The throttle boot can crack from age and cause a noise and loss of power. The best way to find an unmetered air leak is to have a smoke test performed. This costs about 1 hour diagnosis. Or take a good look at the throttle boot for any signs of cracking. Especially in the folds of the throttle boot.

 

Here is a DIY for checking the throttle boot that I like:

http://forum.e46fanatics.com/showthread.php?t=754766

 

Also you can check the DISA flap. I have a video of a failed DISA flap I made that can cause problems.

http://www.youtube.com/watch?v=4KcakwwF0Bc

 

If all this checks out then take a look at the engine air filter and replace if it looks dirty.

If nothing can be found then this may be a bad mass air flow sensor. The best thing to do would be to have the dealer test fit one for you so that you do not have to pay for the part unless you know it fixes the problem.

 

I hope this helps. Please press the feedback tab and leave a short positive comment.

Thank you. :)

 

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Customer reply replied 5 years ago
Ok sir... we try next to workshop. Thanks for idea slove.
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago
You are very welcome I hope this helps!
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Customer reply replied 5 years ago
Hello sir... My automatic transimition very good running, when my car 100k milage, my transimation not power. We try change oil with filter fan after that. But my automatic transimition not perfomace and I feel 20% reduce power. My engine high rest, but my car not pickup. What problem my automatic transimition sir?
BMW Mechanic: Roger, BMW Master Tech replied 5 years ago

Hello,

 

This is a common failure on the E46. The transmission would often not last past 100k and a replacement is needed. Since you have already checked the fluid level and attempted a repair the next step unfortunately is a replacement transmission or having it rebuilt at a transmission shop.

 

The internal clutches slip which causes the high rev. I am sorry to hear you have had this failure. I wish you the best with your repair.

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