Quote:
Originally Posted by andrewwynn
That sounds like DSC erroneously kicking in (clue is reduced power).
I had a wss lose than gave me a very similar sound/sensation.
What scanning solution do you have? Can you realtime read your wheel surf sensors?
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I do, I have a laptop with INPA/ISTA loaded and have used it in the past. I won't be able to do this for a few days. This was an issue this morning, but I just had my rear subframe welded along with fresh bushings and new lemforder parts (the FCP kit) at a shop. They outsourced their alignment to a firestone shop and the steering wheel slipped 2-3 degrees off over Fri-Mon so it's back there to determine the issue and re align it.
Quote:
Originally Posted by wpoll
Did this issue show up around the time you replace the actuator gear? Just askin'... 
Also, when you replaced the fluid in the Xdrive (transfer case) did you perform the required reset/adaptation? This requires BMW-specific software/hardware to do (BMW DIS, BMW ISTA-D or a Foxwell scanner).
And as andrewwynn has asked, are you able to scan for codes etc? |
I don't think this appeared when I did the actuator gear, I checked my photos and apparently it was May 2022 that I replaced the gear. It's made this noise it since pre-pandemic times.
I did not check if the shop that serviced my diff/tc fluids did the reset adaptations. I just called and left a message, they closed 15 minutes ago. My TC drain bolt was stripped so I had them cut it and break it loose. Whoever serviced it in the past used an air gun and didn't torque it.
Quote:
Originally Posted by X5chemist
Sticky caliper?
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I don't know how to determine that.. I had a rotational grind forever on my car from the passenger front side and determined it was a bent disc protector plate thingy. I bent it a little bit and it stopped making that sound. In the past when I've done brake service I haven't thoroughly cleaned the caliper pistons. I cleaned it, but not well enough to be proud of it.
For more information about how the grind sounds/feels: it's inconsistent when it happens. It's not a rotational or speed-increasing sound/feeling through the chassis. It's erratic like if someone threw something into a gear by hand at their discretion, but frequent. LOL.
It sounds as if it comes from the center in front of me, which made me assume pulleys as it sounded far enough forward that it wasn't the transmission/TC.
The drum-finger-rub sound I described that happens simultaneously with the grind, that sound is consistent. It's so shortlived. It's pitched, starts a bit higher, goes to a lower pitch and stays there, then pitches back up and disappears.
I haven't had the balls to give it the beans when this is happening, so the reduced power I mentioned is inferred by my experience lightly tapping the gas and
maybe not experiencing the same amount of power as I would expect.. I'll back out of a driveway onto a residential street, experience it for 10-15 seconds, then by the time I come to a stop and accelerate again to merge onto a road it's gone.
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EDIT: I forgot to mention, I appreciate y'all so much. I love this car to death, I'm still rocking no roof 2 years after replacing my pano tray. idgaf it's such a great drive.