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Old 09-18-2022, 09:55 PM   #1
mcgurj
 
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Grinding Noise

So Iíve been dealing with an annoying grinding or vibration noise coming from somewhere in the drivetrain. IĎve got the A8 transmission. Multiple service departments have been ďunable to reproduceĒ the issue, but one went ahead and did the transmission flush for me anyway. I donít think itís the usual shudderÖitís definitely a sound and not a feeling while Iíve heard the shudder is more of a sensation in the steering wheel. Itís worst up hill and always during acceleration. At first I thought it was during gear changes but I threw it into manual mode and it still happened. I was finally able to get some audio of it, itís not as good as being there live but you can definitely hear it when it happens. I even added some cues to make it easier to spot. 😄

Anyone familiar with this mystery sound?

https://youtube.com/shorts/1qSbB85HwkA?feature=share
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Old 09-18-2022, 10:53 PM   #2
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This sounds much more like gear grinding than rumble strips, I'm also leaning towards this being a different issue.

It's the first time I'm hearing this specific noise, so I don't think I can help, hopefully someone with more experience will
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Old 09-18-2022, 11:17 PM   #3
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That would annoy the heck out of me….Just from the video, it sounds like a low rpm on throttle metal on metal vibration. Possibly the exhaust rubbing, maybe something else (although kinda hard to tell not being there) Do you have NPP? If so, I’d pulling the NPP fuse to deactivate a possibly noisy valve. If that doesn’t quiet it down, I’d be checking the rest of the exhaust and heat shields.

Good luck, mystery noises can be a PIA.
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Old 09-19-2022, 08:25 AM   #4
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Quote:
Originally Posted by Chutzpah View Post
That would annoy the heck out of meÖ.Just from the video, it sounds like a low rpm on throttle metal on metal vibration. Possibly the exhaust rubbing, maybe something else (although kinda hard to tell not being there) Do you have NPP? If so, Iíd pulling the NPP fuse to deactivate a possibly noisy valve. If that doesnít quiet it down, Iíd be checking the rest of the exhaust and heat shields.

Good luck, mystery noises can be a PIA.
Itís annoying alright! And more than a little embarrassing to take off from a stoplight and have it grind like thatÖsounds like I donít know how to drive a stick (though itís actually an automatic.) Definitely sounds like metal on metal but thereís no felt vibration anywhere. Not the steering wheel, shifter, or in the seat.

I donít have NPP.
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Old 09-19-2022, 10:43 AM   #5
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Quote:
Originally Posted by mcgurj View Post
Itís annoying alright! And more than a little embarrassing to take off from a stoplight and have it grind like thatÖsounds like I donít know how to drive a stick (though itís actually an automatic.) Definitely sounds like metal on metal but thereís no felt vibration anywhere. Not the steering wheel, shifter, or in the seat.

I donít have NPP.
Does yours have cylinder deactivation? If so, it could also be one of the AFM valves needing to be lubricated. Just throwing things out thereÖ
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Old 09-19-2022, 06:00 PM   #6
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Grinding Noise

It does have the AFMÖI read somewhere that that might cause a noise.

I also wonder about hill start assist, if the clutch may have an issue or something since it always seems to get worse uphill.


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Old 09-22-2022, 11:53 AM   #7
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Quote:
Originally Posted by Chutzpah View Post
Iíd be checking the rest of the exhaust and heat shields.
I also favor this theory. AFM is in that ballpark.
This sounds like you are hitting a resonance frequency and something is vibrating.
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Old 09-22-2022, 10:28 PM   #8
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Thank you both, I will take a look for something loose.


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