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What is this noise :-(

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Old 09-08-2021, 04:25 PM
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GLC Coupe, S63L W222
What is this noise :-(

Hello all,
(S63L W222 (2016) AMG with M157 engine) - 50k Miles

I'm getting this noise when I heavily accelerate or lets just say put my foot down in 1st gear

No issues with power or performance, Star Xentry showing nothing.

But noise is quite loud, it comes and goes I think.
Any help would be appreciated as the Mercedes technicians here in the UK play a lot of guess games and I would rather point them in an area they can look as my car has gone in to dealers now.

Many thanks

(Didn't have any luck here so removed the videos.)

Last edited by sambam2006; 09-15-2021 at 06:35 PM.
Old 09-09-2021, 10:47 AM
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GLC Coupe, S63L W222
Dealer has got back to me and said it could be Pulley, Belt or Turbo.

Car is performing exceptionally well, no smoke, acceleration is excellent, surely can't be?
Old 09-25-2021, 07:40 PM
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Update: Issue resolved. The transmission required 2 liters of oil, the noise went away.
Old 11-07-2021, 10:30 AM
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Originally Posted by sambam2006
Update: Issue resolved. The transmission required 2 liters of oil, the noise went away.
Wow! Hopefully no harm was done.
Old 08-06-2024, 02:10 AM
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@sambam2006 You had a few vids on this issue on MBUK, but they were private. Could you post them here please? I think ive ghot the same issue and just want to confirm.
Old 08-06-2024, 05:30 PM
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Send me your videos, upload on youtube and post link here, I'll check for you thanks
Old 08-09-2024, 01:15 AM
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Originally Posted by sambam2006
Send me your videos, upload on youtube and post link here, I'll check for you thanks
Hi sambam2006. Im finding it difficult to get the noise on video. Would it be a problem for you to link me your videos, please?
Old 08-17-2024, 12:25 PM
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Originally Posted by Sterlingdave
Hi sambam2006. Im finding it difficult to get the noise on video. Would it be a problem for you to link me your videos, please?

I believe it’s similar or exact to this sound, when undrr heavy accel and during up shift only.
Attached Files
File Type: mov
RPReplay_Final1723911228.mov (13.71 MB, 5 views)
Old Yesterday, 02:14 PM
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Originally Posted by E63SAMG2014
I believe it’s similar or exact to this sound, when undrr heavy accel and during up shift only.
That's your blow off valve, or in the case of MB it's the turbo wastegate. I can't hear it on my S63, but that's a totally normal sound for a wastegate to make. Rice tuners use this process to make all kinds of fun sounds, but normally it's quieter on MB cars. Point being, the turbo wastegate is what's making that noise, but yours sounds like it's not letting the turbo get to max pressure before releasing, therefore channeling the turbo pressure out of the intake. If it is in fact behaving abnormally your car won't accelerate as hard as it would otherwise.

But it makes that sound normally when the transmission shifts. So if it does that when shifting, or anytime you lift off the accelerator pedal, it's totally normal.

Last edited by carlosinseattle; Yesterday at 02:18 PM.

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