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      05-24-2019, 05:37 PM   #1
pachieh
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Bzzzzzz on accel/decel, weird noise

I've noticed as of late that from the right side of the car, when I accel/decel, I get a faint but noticeable 'bzzzzzz' that changes with RPMs.

It almost sounds like leaves or a plastic bag are stuck somewhere, but on visual inspection I can't see anything. Kinda reminds me of a cheap 4-cylinder engine sound.

I do have a broken exhaust hanger on my Eisenmann right at the weld, but it's definitely not the source.

Anyone else deal with this?
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      05-24-2019, 07:48 PM   #2
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i have not experienced this but check heat shields... they may be rattling against exhaust or the ones around the rotors may have some interference etc. outside of that not certain i could help without a sound clip.
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      05-25-2019, 05:35 AM   #3
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Is it happening when your climate control is on?
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      05-25-2019, 12:52 PM   #4
pachieh
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I'll try with climate off, but I don't hear it inside the car when the windows are up. Definitely outside...

I'll crawled around under and didn't see/feel anything loose...

Closer inspection of the broken exhaust hanger shows a hole where the hanger broke off. It's about two inches long and the exact shape of the weld on the hanger. I guess this COULD cause the problem with exhaust having a "flute like exit" disrupting the even flow out...
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      05-28-2019, 08:57 PM   #5
pachieh
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Yup, think this is solved. Exhaust shop rewelded the hanger back on and sealed up the hole on the pipe it caused when it ripped off.
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      05-28-2019, 10:23 PM   #6
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Ok perfect glad things worked out for you.
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      05-29-2019, 02:18 PM   #7
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looks like a defect to me. see if BMW will warranty it

Quote:
Originally Posted by pachieh View Post

Closer inspection of the broken exhaust hanger shows a hole where the hanger broke off. It's about two inches long and the exact shape of the weld on the hanger. I guess this COULD cause the problem with exhaust having a "flute like exit" disrupting the even flow out...
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      05-29-2019, 11:15 PM   #8
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Quote:
Originally Posted by pachieh View Post
I've noticed as of late that from the right side of the car, when I accel/decel, I get a faint but noticeable 'bzzzzzz' that changes with RPMs.

It almost sounds like leaves or a plastic bag are stuck somewhere, but on visual inspection I can't see anything. Kinda reminds me of a cheap 4-cylinder engine sound.

I do have a broken exhaust hanger on my Eisenmann right at the weld, but it's definitely not the source.

Anyone else deal with this?
YES! I had it on both my 2014 F15 and my 2017 F85. Only at freeway speeds and only when I decelerated. I couldn't hear it in acceleration. I would tell the service dept about it and they couldn't hear anything, even when I drove with them and pointed it out. It sounded like it was coming from the wheels and I figured it was a bearing or something that was at a frequency that not everyone could hear. That sounds crazy I know. Anyway, my wife just got an X7 and first thing I did was listen for it and it's not there or I'm no longer crazy.
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