BMW howling sound from the rear end.

A

arny14

Member
Hello,

[E85_200_3.0_6_speed_manual]

I have this weird noise https://www.youtube.com/watch?v=_GPyuxuyJRw around 20-30km/h (12-18mph) during the acceleration. Now I changed the differential, but the issue is still the same. :headbang:
I have poli bushings, but the noise was noticeable with the originals too.
Maybe every diff has this sound? Or coming from the different area? Any idea?
 
Something to do with the prop shaft ? Universal joint, is there a clunking noise when you lift of the accelerator?
 
If it's at just those speeds is it resonance? Something vibrating at just that frequency?
 
I had a wah wah wah wah noise from the rear, turned out to be the rear tyre's had gone out of shape.
Nice and quiet now
 
Hey, no clunking noise, but the howling only come during the acceleration, also changed the tires 2 weaks ago. Yes maybe resonation, but i cannot find any loosen suffs, and i think it should resonate both during accel-deccel.
 
Do you have split rims, are the screws tight? Someone else on here had an odd noise and the screws were loose.
 
MikeyH said:
Someone else on here had an odd noise and the screws were loose.
Click to expand...
There are a few on here with a screw loose, mate! :D
 
2011 z4 30I
I'm getting a slight humming sound from the rear differential area. changes intensity with the rpm change? I've changed the fluid but noise still there? 105k miles any one have any ideas?
 
ml1nov1980 said:
2011 z4 30I
I'm getting a slight humming sound from the rear differential area. changes intensity with the rpm change? I've changed the fluid but noise still there? 105k miles any one have any ideas?
Click to expand...
Check your rear tyre's, mine had gone out of shape, I thought my diff was going. New tyre's and nice and quiet now.
 
Don't under estimate how much noise tyres can make. I had a set of cheap tyres on an E85 I bought and I stopped 3 times on the way home that day they made so much noise - thought a wheel bearing was disintegrating! Put new tyres on a week later and silence.
 
[ref]firebobby[/ref], from ml1nov1980. When you were getting noise from your tires did the noise go up and down with the rpm's?? The noise I have will increase slightly in sound when I accelerate and then stop when I let off the gas?? So It must only make the sound when it is under load or torque? I'm thinking tires would be a constant hum sound and not change with the rpm?? Your thoughts!! I do have the run flat tires on the car, very noisy, and rough riding but still in good shape! Thanks for the response! Mike
 
ml1nov1980 said:
[ref]firebobby[/ref], from ml1nov1980. When you were getting noise from your tires did the noise go up and down with the rpm's?? The noise I have will increase slightly in sound when I accelerate and then stop when I let off the gas?? So It must only make the sound when it is under load or torque? I'm thinking tires would be a constant hum sound and not change with the rpm?? Your thoughts!! I do have the run flat tires on the car, very noisy, and rough riding but still in good shape! Thanks for the response! Mike
Click to expand...
I'm not sure, but think it did. I found run flats, terrible for handling on my car.
How old are they, try jacking the rear up and running it in gear, see if the tyre's are out of shape.
Like I said, my tyre's were the cause of the noise, and it sounded like the diff/bearing noise.
Hope that helps
 
arny14 said:
https://www.youtube.com/watch?v=_GPyuxuyJRw
Click to expand...

This is the most uncharacteristic Z4 video I have ever seen - roof up in sunny weather and an inordinate amount of indicating :rofl:
 
I found that the noise is the pinion gears😩😩😩 Also found it is cheaper to change the entire diff with a used one than to put in new pinion gears!!
 
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