05-24-2019, 05:37 PM | #1 |
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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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2017 X5M, Donnington Grey, Aragon Brown
Eisenmann Pro, Dinan Intake, BM3 Stage 1, XHP Stage 3 21" Vossen VFS-1 on Michelin PSS |
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, 12:52 PM | #4 |
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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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2017 X5M, Donnington Grey, Aragon Brown
Eisenmann Pro, Dinan Intake, BM3 Stage 1, XHP Stage 3 21" Vossen VFS-1 on Michelin PSS |
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05-28-2019, 08:57 PM | #5 |
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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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2017 X5M, Donnington Grey, Aragon Brown
Eisenmann Pro, Dinan Intake, BM3 Stage 1, XHP Stage 3 21" Vossen VFS-1 on Michelin PSS |
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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
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05-29-2019, 11:15 PM | #8 | |
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