10-04-2019, 07:36 PM | #1 |
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B58 metallic fluttering sound
Hey everybody. 2016 340i xDrive I bought it about a year ago with one year left on the warranty and 20000 km on the engine. For the first six months all was nice I love the sound of the engine and the exhaust I drove with the windows down everyday. At about the 6-month mark and 25000km I started to develop a ticking or fluttering sound when giving 30 to 60% throttle between 1000 and 3000 RPM which is pretty much where it's driven 80% of the time around town. It could only be heard with the passenger side window down and driving next to something that would reflect the sound back into the vehicle. It continued to increase as time went on. I tried changing from 91 octane to 94 Chevron or shell v-power and it made no difference. The sound is most noticeable on cold start idle and in the first 15 minutes of driving it does quiet down a little bit when the engine is warm but is still quite loud. I took it into the dealership a few months ago to have a broken exhaust valve spring replaced and ask them to look into possible noisy injectors and they said that everything was normal. Couple days ago I took the car in for its last warranty oil service and requested a test drive with the lead hand technician in the shop. During the test drive he commented that he could definitely hear the noise I was referring to and was thinking it could have something to do with a loose wastage or other turbo issue. To compare engine sounds we took out another 440i with the b-58 to see how it sounded. The 440 sounded just like mine did when I first bought it no metallic flutter nice and smooth and sporty. The car has since been in their shop for about 4 days unfortunately they have not tracked down the source of the metallic flutter but they definitely agree there is an issue there I will report back their findings when I know.
If anybody else has experienced this please comment. On a side note this has unfortunately prevented me from installing my new KW SC coilovers that were scheduled to go in two days after the service so I had to cancel the appointment. |
10-04-2019, 09:11 PM | #2 |
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Update. Dealer just called said they traced it to vant valve that circulates emissions. EGR valve? Hopefully it fixes the noise. I will report back once the repair is complete
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10-04-2019, 10:54 PM | #3 |
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Drives: 2007 E90 335i, 2016 F80 M3
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Sorry for your luck, keep us updated! The B58 has been pretty solid for the most part!
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2016 F80 M3 6MT Azurite Black/Sakhir Orange Full Leather
2007 E90 335i 6MT Black Sapphire Metallic/Terra Brown Leather 2017 F32 440i xDrive 6MT Alpine White/Coral Red Leather (SOLD) 2006 E90 330i 6MT Arctic Metallic/Lemon White Leather (SOLD) |
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10-04-2019, 11:06 PM | #4 |
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I believe I hear the same sound on mine. Loaner 40i didnt do it (I havnt talked to the dealer about this noise though, i was in for another issue). Please keep us posted, as my car does it under the same conditions.
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10-05-2019, 06:42 PM | #5 |
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Does your sound also not increase or decrease with rpm? Im having a massively similar issue in my 340i.
Like you, it's only really audible with windows down and next to a wall or something that reflects the sounds back. I always thought mine was coming from the rear of the car but sounds do travel. |
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10-06-2019, 12:05 AM | #7 | |
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10-06-2019, 09:07 AM | #8 | ||
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10-07-2019, 12:09 AM | #9 | |||
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10-08-2019, 12:57 PM | #11 | |
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So back to shop it goes today. I will update when I have some info. |
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10-10-2019, 02:02 AM | #12 | ||
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10-10-2019, 05:11 PM | #13 | |||
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10-14-2019, 12:46 AM | #14 |
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got my car back for a second time all they did was make some adjustments to some metal shielding around the air filter and did an ECU reprogram and said they couldn't hear it anymore. took it out for a drive sound is still there left it at the dealership. hopefully third time is a charm but it doesn't seem like they're interested in replacing any parts to fix the issue. I have a funny feeling it's just noisy injectors but the noisiest you've ever heard.
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10-19-2019, 12:03 AM | #15 | |
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10-22-2019, 01:39 AM | #17 |
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'16 340i same noise on cold startup and for first few miles, afaik. (i always drive with windows up) Going to pay more attention to it now, I'll report back in a few days.
Edit: 26k miles |
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10-29-2019, 06:53 PM | #18 |
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UPDATE: BMW called today said the new turbo is installed and road tested. They say the metallic flutter noise is gone! They are going to keep it over night and take a final road test in the morning to make sure it's good on a cold start. It's been near freezing here in the mornings so should be a good test. Keeping my fingers crossed on this one cause they've said this before but still I'm excited it's been 3 weeks.
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10-30-2019, 06:11 PM | #19 |
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got the car back just drove it home and the mettalic flutter is gone and I couldn't be happier. I can enjoy the sweet sound of the i6 again. time to get the kw's installed!
edit: just want to add that the technician said it was the turbo wastegate that was the issue |
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11-02-2019, 08:02 PM | #20 |
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Do you know, or did he say if it was harmful, or just annoying?
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11-02-2019, 10:37 PM | #21 | ||
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He didn't say. The word from the SA was the lead hand said the waste gate was acting up. Don't really know what he meant by that. It didn't sound like the vids I watched of the waste gate issues the older 335's so not sure. It could be in my head but it does feel like there's a little more low end pull. To me it sounded like an exhaust leak so maybe the waste gate wasn't sealing properly. |
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08-21-2020, 09:13 AM | #22 |
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Just came across this thread and I've experienced the same noise since I've owned my 2016 340i. It's been to the dealer before for wastegate ticking noise on cold start (it's more noticeable in cold weather) but BMW said it's normal.
Car is going back to the dealer next week for inspection and low coolant so maybe they can look at this fluttering noise again. |
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