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      08-09-2015, 11:46 AM   #1
dL.
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Strange Engine Whirring Noise at 70-75mph

Hey guys,

So I have this really strange and faint whirring/whining somewhat-high-pitch noise coming from the engine area since day 1. The noise is quite faint but noticeable once you know how to detect it. I have tested many scenarios and it only happens when:

- I am not pressing the pedal
- When speed is 110-120km/h or 70-75mph, different RPM does not alter the sound

The moment when I step on the pedal at that range (even the slightest press), the noise stops. If I drive faster than 75mph and let go of the gas, it also stops but will come back when it hits that speed range. Speed below 70mph will also not cause this noise.

I have no idea what's going on. I have a 2015 335i xDrive with the M Power Kit and my previous 2013 335 without power kit doesn't do that.

Has anyone experienced this before?

dL
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      08-31-2015, 01:15 PM   #2
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I have a very similar sound happening between 65 and 80. When letting off the gas and coasting it will make a noise that sounds like whining gears/noisy diff. It's hard to describe the noise but it only happens between these speeds. I've been trying to figure out what is causing the noise and I'm almost certain it's the transmission, one of the diffs or the transfer case.

When driving in EcoPro mode there is a "coasting" feature that will decouple the trans to allow the car to coast without any engine braking. This happens when you let off the gas at hwy speeds.

When you activate EcoPro the display under the speedo changes from "instant mpg" to "power/charge" There is a little arrow that will slide back and forth over the "power/charge" section. The power and charging indication is separated by a small square box. This arrow will normally be white; when "coasting" is active it will be in the little box and change to blue.

When the car it goes into "coasting" mode the noise completely stops.

Does this describe your situation?

Try this scenario out and see what happens. Maybe it's normal, maybe it's not. Either way its extremely annoying to hear this sound.

Below is taken from BMW's product dealer information:

Powertrain. Pressing down on the accelerator, the driver encounters a “plateau” of resistance at the end of the high-efficiency range. (However, the driver can get maximum acceleration by flooring the pedal.) Transmission upshifts and downshifts occur at lower speeds. In most 2015 models, ECO PRO provides a “coasting” mode that disengages the engine from the drive wheels when the driver lifts off the accelerator at cruising speeds up to 100 mph.




Last edited by skiingmav; 08-31-2015 at 01:22 PM.
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      09-03-2015, 11:36 AM   #3
dL.
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Yes you nailed it. I tried Eco pro mode and the noise is gone when it's coasting.

Have you figured out what the problem or fix might be? Has anyone else encountered this as well?

dL
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      09-03-2015, 11:32 PM   #4
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This might sound like a dumb question, but do you have run-flats? You'd be surprised at the kinds of strange "engine like" sounds run-flats can produce on clean pave.
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      12-03-2016, 04:57 AM   #5
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Sorry to revive an old thread, but has anyone found a solution to this issue. I was noticing the exact same "whine" that sounded like bad differential when I let off the accelerator between 75mph to about 60mph. It goes away immediate if I get back on the throttle. I can't tell if it's drivetrain or the runflats. And I also have a 2015 335ix. Thanks folks!
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      12-03-2016, 09:00 PM   #6
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I had the same issue you describe. Dealer found the issue was the transfer case. Replaced under warranty and the sound no longer happens. Mine is a 2016 435ix.
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      12-05-2016, 02:32 AM   #7
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Quote:
Originally Posted by BHK View Post
I had the same issue you describe. Dealer found the issue was the transfer case. Replaced under warranty and the sound no longer happens. Mine is a 2016 435ix.
Thanks for the quick reply! I really appreciate it. I will make a note of it to the dealer the next time I head in. It doesn't seem to cause any issues thus far. But I'd better have it looked at.
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      09-13-2017, 03:35 PM   #8
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Transfer case whine from tires not being worn the same front/back

I have a 2016 F36 w/xDrive and both M performance packages on it. I love driving the car (so responsive compared to my 328i) but about 6 months into owning it, I noticed a low-pitched whine that starts at 65 mph and carries through to 75 mph...then disappears. It is louder when the throttle is slack, and it doesn't seem to matter what gear I am in while going through that speed range (or RPM level). I recently took it into the BMW dealership and had the shop foreman come for a ride and he definitely heard it loud and clear, noting the difference in sound when letting the throttle off in that range. They didn't think it was tires, as they checked everything...and they even took another used F36 out they had on the lot and it did it too. Their conclusion: this is just normal for the car. After talking to the service manager and him confirming that multiple other customers have complained of the same thing, I escalated to BMW Canada. They sent me to another dealership and ended up with a new transfer case...but the sound didn't go away (slightly different but still there)! After re-measuring the tires (2mm difference in wear between front and backs, which should not cause any issues), they decided to experiment with a set of used back tires that had the same wear as my fronts...and the sound went away! So, this means that after 4 months of driving on my tires, they ended up not being the same wear and the sound started...so even buying new tires I'm going to have the issue every 4-5 months! BMW dealer is still looking into it, as they don't think the 2mm difference should cause the noise in the transfer case...but it does. Anyone else have this?
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      09-13-2017, 10:38 PM   #9
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Quote:
Originally Posted by DrivingInOttawa View Post
I have a 2016 F36 w/xDrive and both M performance packages on it. I love driving the car (so responsive compared to my 328i) but about 6 months into owning it, I noticed a low-pitched whine that starts at 65 mph and carries through to 75 mph...then disappears. It is louder when the throttle is slack, and it doesn't seem to matter what gear I am in while going through that speed range (or RPM level). I recently took it into the BMW dealership and had the shop foreman come for a ride and he definitely heard it loud and clear, noting the difference in sound when letting the throttle off in that range. They didn't think it was tires, as they checked everything...and they even took another used F36 out they had on the lot and it did it too. Their conclusion: this is just normal for the car. After talking to the service manager and him confirming that multiple other customers have complained of the same thing, I escalated to BMW Canada. They sent me to another dealership and ended up with a new transfer case...but the sound didn't go away (slightly different but still there)! After re-measuring the tires (2mm difference in wear between front and backs, which should not cause any issues), they decided to experiment with a set of used back tires that had the same wear as my fronts...and the sound went away! So, this means that after 4 months of driving on my tires, they ended up not being the same wear and the sound started...so even buying new tires I'm going to have the issue every 4-5 months! BMW dealer is still looking into it, as they don't think the 2mm difference should cause the noise in the transfer case...but it does. Anyone else have this?
Damn... I'm having this same issue - f30, 335, staggered tires.

From about 65-70 under load i get a whine noise thats pretty feint, but I can hear it...

I'm going to take it to the dealership later this week. We'll see what happens. I'll update when I find out but it'll be a late update.
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      Yesterday, 04:03 PM   #10
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Same issue here, 19" staggered setup.

50000 km's

RFT tires have 3mm front and 2mm rear tread left.

is there a way to know for shure its the transfercase ?

dont want to bring it to the stealer.
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      Today, 06:50 AM   #11
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Interesting. I have the same. Looks like all X drive cars, too, in this thread.
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      Today, 01:41 PM   #12
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First post here; been lurking for a while. This thread goaded me into registering. I have a 328xi and heard a similar noise while under cruise control on the highway this weekend. My first long trip with the car. Right around 80mph (2000-2200 rpm) I heard what sounded like , well, whirring or maybe the engine being under load? At the time I thought it sounded like what a motor would sound like without enough oil lubrication. Only really heard it when the radio volume was low or when the road pavement was smooth (no road noise). I'm going to an indy for an oil change in about a week and will ask them for their input.
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