08-15-2019, 07:02 PM | #1 |
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What is this squealing noise? [Solved]
Hi everyone,
2015 BMW M3 There is this squealing noise coming from the engine bay area. Sounds like it's closer to the driver side. You could hear it pretty loud by the wheel well. The noise is not there or that noticeable on cold start. You start to hear it when it's warmed up. You don't hear it when you RPM is above 2500. Turning off the A/C didn't change anything. Thank You for the help. **SOLVED** So it was a faulty valve cover assembly, or it could just be the PCV valve/crankcase vent valve that is bad but it's built into the valve cover so BMW replaces the whole valve cover to fix the issue. If you have this whining/whistling noise link in the video and you open the oil cap (where to add oil to the engine) and the noise goes away or lessens, then it's your PCV valve/crankcase vent valve that's bad. I'll attached the receipt from BMW. Last edited by iendless; 08-28-2019 at 11:50 PM.. Reason: SOLVED |
08-16-2019, 11:19 AM | #2 |
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Sounds like alternator bearings in my opinion. The fact that you hear it lower in the wheel well also corroborates this since it's mounted lower in the engine bay. In any case that needs to go in and be properly diagnosed.
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08-18-2019, 11:25 PM | #3 | |
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08-20-2019, 02:53 PM | #4 |
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Some more details about the issue/sound.
I got under the car today and remove the covers under the car. The sound seems to be coming from somewhere around the transmission or so. Here is a video of it, |
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08-20-2019, 06:49 PM | #5 |
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I guess you may have missed this thread below which sounds like the same issue.
https://f80.bimmerpost.com/forums/sh....php?t=1587003 |
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08-20-2019, 07:55 PM | #6 | |
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I will be dropping the car off at BMW next Monday. |
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08-20-2019, 07:59 PM | #7 |
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I would visually inspect around the valve cover and also see if you can feel air being pushed out. Sounds like an easy DIY fix to change a valve cover and seal. I'm sure you can google it and get a tutorial for it. $2000 for that job is highway robbery.
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08-20-2019, 08:47 PM | #8 | |
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Even if air is being pushed out around the valve cover, would that whining sound come from around the transmission below the car? Because I don't really hear the whining sound around the engine bay or near the valve cover, it's the loudest around the transmission under the car(you can really hear it in the 2nd video I posted). Thanks again. |
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08-28-2019, 11:46 PM | #9 |
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So it was a faulty valve cover assembly, or it could just be the PCV valve/crankcase vent valve that is bad but it's built into the valve cover so BMW replaces the whole valve cover to fix the issue.
If you have this whining/whistling noise link in the video and you open the oil cap (where to add oil to the engine) and the noise goes away or lessens, then it's your PCV valve/crankcase vent valve that's bad. I'll attached the receipt from BMW. |
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12-03-2019, 09:53 AM | #10 | |
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12-04-2019, 11:34 PM | #11 | |
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It only occurs once the car is warmed up and then, only at idle and up to ~2k RPM. Thank goodness for the extended warranty. Just sucks that it's quoted as an approximately 10hr job.
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03-02-2022, 12:45 PM | #13 |
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04-19-2022, 01:34 PM | #15 |
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It's about $700 for an OEM valve cover from FCP Euro. The job is tedious but not really difficult and took me about 4-5 hours. I'd recommend replacing the vent hose that attaches to the front of the valve cover while you're there since it tends to get brittle.
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