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07-16-2023, 11:45 PM | #1 |
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Just went for a drive and noticed a constant, high pitched whistle sound. It didn’t sound nearly as loud as it does on the dash cam footage - I could only barely hear it with all the windows up and low RPM.
I recently had both belts, alternator, AC compressor, & idler pulley replaced. Any ideas what this could be? Oil pump? Dash cam video - E90 M3 engine whistle Last edited by jmw_m3; 07-18-2023 at 04:45 PM.. |
07-17-2023, 01:23 AM | #2 |
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07-17-2023, 01:59 AM | #3 |
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07-17-2023, 02:38 AM | #4 |
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07-18-2023, 11:58 AM | #5 |
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Update: I didn't hear the whistle/whine for the first 45 minutes of my morning commute in heavy LA traffic. As soon as it opened up and I did a pull, I heard the sound while decelerating. The sound stayed consistent right until I pulled into my parking spot, when it just completely went away.
Does anyone have any ideas? |
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07-18-2023, 06:31 PM | #7 |
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You know what it reminds me of? That feedback sound you get when the audio system isn't properly grounded. Did you make any audio changes recently?
Can the sound be heard from outside the car? Or only in the cabin. Try to disconnect the amp and see if it goes away. |
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07-18-2023, 09:51 PM | #8 | |
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I just took the below video and it’s definitely coming from under the hood. Kind of seems like the passenger side, but it’s so hard to tell. engine bay whistle |
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07-18-2023, 10:21 PM | #9 | |
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Could it be that OPs noise coincides with when the alternator is charging? |
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07-18-2023, 10:34 PM | #10 | |
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