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Hmmm this is weird, I don't see at idle how such a sound could be produced even by a leaking intake system.
If you are a bit handy, you can make sure that the accordion section of the intake system is still well clamped, but other than that I can't see what it could be base on the info I have.
Maybe PCV system?
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TOTALED  | 2011 E90 335i xDrive - BMS Cold Air Intake - ETS Charge Pipe - ETS 7" FMIC - MHD Stage 2+ - GFB DV+ - PE Mod - VRSF Catless Downpipe - xDelete - xHP Stage 3
2015 E84 X1 35i M-Sport
Last edited by TheGoodTheBadTheUgly; 03-08-2020 at 10:41 PM..
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