03-25-2019, 08:59 PM | #1 |
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Buzzing sound...normal?
I just starting hearing this buzzing sound. The car was cold, drove it for about 5 minutes.
After I heard the sound, drove it for another minute, and it went away, couldn't replicate it. But likely to come back... Something to worry about? Any thoughts would be appreciated |
03-26-2019, 02:22 AM | #2 | |
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definitely get it checked
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03-26-2019, 12:38 PM | #4 | |
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I scheduled a 55-pt. inspection next week with the dealership, at which I will address this issue (along with an issue that I am having with the clutch/transmission when the car is warm). But it would be great to have some insight before then so that I have an idea of what I am talking about... |
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03-26-2019, 01:03 PM | #5 |
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Which engine and which year? Try to blip the throttle a little bit when you have the sound and see if it goes away. If yes to that, early N55 and if the sound comes from the turbo direction it can be the boost solenoid.
https://www.youtube.com/watch?v=IYt8fLTzh_U |
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03-26-2019, 02:13 PM | #6 |
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Sounds like a B below middle C to me, more of a hum than a buzz. That rules out the usual suspects. Does the pitch change with engine speed?
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03-26-2019, 03:25 PM | #7 | |
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Maybe something to do with the waste-gate solenoid? |
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03-26-2019, 06:32 PM | #8 |
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I have a similar intermittent buzz coming from my pwg N55. I've read it could be the boost solenoid, apparently also called the turbo pressure converter. The replacement part for my car is about $160. Thinking about just replacing it, partly as preventative maintenance, partly in hopes it eliminates the buzzing.
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03-26-2019, 06:33 PM | #9 |
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Weird buzz sound on passenger side on engine bay https://f30.bimmerpost.com/forums/sh....php?t=1563523
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03-26-2019, 08:33 PM | #11 | |
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Thanks! |
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03-27-2019, 07:40 AM | #12 |
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In my experience the boost solenoid buzzing occurs as the revs drop to idle. So once engine is warm so that it has the normal low idle revs then give throttle a short tap. As it then returns to idle revs it sometimes starts buzzing and sometimes not.
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03-27-2019, 08:54 AM | #13 |
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That's why I asked if the pitch changed with the engine revs. It would go up and down with the revs if it was mechanical, but would probably stay constant if electrical.
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03-27-2019, 09:18 AM | #14 | |
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If it comes back, I will certainly check whether the buzz/hum changes with the revving of the engine. |
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03-27-2019, 12:05 PM | #15 |
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If it's serious it should show up on a scan with a good quality OBD diagnostic tool. Once out of warranty you really should have one, not only to know when you have a problem but also to know when you don't. Mine paid for itself the first time I used it.
http://f30.bimmerpost.com/forums/sho...2#post23288222 |
03-27-2019, 12:50 PM | #16 | |
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https://www.amazon.ca/Diagnostic-FOX...gateway&sr=8-1 |
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03-27-2019, 01:14 PM | #17 |
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I have the NT 510, the NT 520 is a newer version but the only advantage to it is it can store data for more car brands. If you have trouble with it go here:
http://www.foxwellsupport.com/tag/foxwell-nt510/ |
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03-28-2019, 10:43 AM | #18 | |
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By the way, did the dealer share any details about any stored codes? |
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03-31-2019, 07:45 PM | #20 |
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Update: heard the whirring/buzzing noise just now; started as I was slowly backing up, continued as I was idling; I revved the first time, it went away; I revved again, it came back, but slowly dissipated; I revved again, and it came back, and slowly dissipated etc.
I'll update after my 55-pt. inspection this week. |
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04-10-2019, 05:18 PM | #21 |
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Dear all,
I am posting another video of the sound. It is becoming more frequent. I have located it on the passenger side of the engine (please see video). The sound does not get louder or softer with engine revving. It will generally go away once I rev. As always, all comments are much appreciated. |
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