2011 W212 - Whistling/Squeaking sound when accelerating
Thread Starter
Junior Member
Joined: Feb 2023
Posts: 16
Likes: 1
From: New York
2011 E350
2011 W212 - Whistling/Squeaking sound when accelerating
Hi all,
I am having a noise issue when I accelerate. Initially I thought it was brakes as it would squeak when I would brake. Took it to dealership, and it was resolved when they installed new brake pads and rotors.
Immediately after picking up my vehicle and driving it back home, I noticed the sound was gone when I would brake. But there was a new sound when I would accelerate and it appears to be coming from the engine. Took it back to the dealership twice now and they cannot seem to find the issue, but do acknowledge that there is a noise. They checked EVERYTHING and said it’s good, including all belts and pulleys. In fact they even lubed up the belts the 2nd time around thinking the noise would go away but it didn’t.
Attaching 2 short videos for reference of the sound which you can hear at the beginning as I begin to accelerate. It continues and never stops, but due to the size and length I cut the clips short.
ANY help is much appreciated.
I am having a noise issue when I accelerate. Initially I thought it was brakes as it would squeak when I would brake. Took it to dealership, and it was resolved when they installed new brake pads and rotors.
Immediately after picking up my vehicle and driving it back home, I noticed the sound was gone when I would brake. But there was a new sound when I would accelerate and it appears to be coming from the engine. Took it back to the dealership twice now and they cannot seem to find the issue, but do acknowledge that there is a noise. They checked EVERYTHING and said it’s good, including all belts and pulleys. In fact they even lubed up the belts the 2nd time around thinking the noise would go away but it didn’t.
Attaching 2 short videos for reference of the sound which you can hear at the beginning as I begin to accelerate. It continues and never stops, but due to the size and length I cut the clips short.
ANY help is much appreciated.
Last edited by Tennislegend; Apr 14, 2024 at 06:03 PM.
Joined: Nov 2016
Posts: 7,847
Likes: 3,496
From: Maryland
2015 SL400 (M276 Turbo), 2014 C350 Sport (M276 NA), 2004 SL500 (M113), 2004 Audi TT225 (BEA)
Sorry, don't hear anything unusual. No squeaking, etc.
But if you hear it, it is likely a vacuum leak somewhere. You don't have a turbo.
But if you hear it, it is likely a vacuum leak somewhere. You don't have a turbo.
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
sounds ok
+1 I side with JR: it sounds like a good car. 
Not belt and not brakes...
PCV whistling?
The release to open the engine hood is located on the driver side. Perhaps better chance to hear and identify something there.
What's the mileage and service record???
🤞
Not belt and not brakes...
PCV whistling?
The release to open the engine hood is located on the driver side. Perhaps better chance to hear and identify something there.
What's the mileage and service record???
🤞
Newbie
Joined: Oct 2022
Posts: 8
Likes: 0
2010 E500
Can hear the faint squeaking sounds, if you bounce the car can you hear it? does it sound like is associated to going over bumps?
Do you hear the noise when Park and free revving?
Do you hear it stalling the car up on the brakes?
I know how annoying it can be to track down sounds, I've been trying to nail one down for over a year.
Do you hear the noise when Park and free revving?
Do you hear it stalling the car up on the brakes?
I know how annoying it can be to track down sounds, I've been trying to nail one down for over a year.
Thread Starter
Junior Member
Joined: Feb 2023
Posts: 16
Likes: 1
From: New York
2011 E350
Thread Starter
Junior Member
Joined: Feb 2023
Posts: 16
Likes: 1
From: New York
2011 E350
Can hear the faint squeaking sounds, if you bounce the car can you hear it? does it sound like is associated to going over bumps?
Do you hear the noise when Park and free revving?
Do you hear it stalling the car up on the brakes?
I know how annoying it can be to track down sounds, I've been trying to nail one down for over a year.
Do you hear the noise when Park and free revving?
Do you hear it stalling the car up on the brakes?
I know how annoying it can be to track down sounds, I've been trying to nail one down for over a year.
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MBWorld Fanatic!
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Try to inspect heat shield near propeller shaft tunnel. See anything is touching the propeller/main shaft from tranny to differential. The nylon plastic nut get lost often at that area
I got twice weird case, read here : https://mbworld.org/forums/e-class-w...expensive.html
I got twice weird case, read here : https://mbworld.org/forums/e-class-w...expensive.html
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Newbie
Joined: Nov 2024
Posts: 1
Likes: 0
Hi there
Hi all,
I am having a noise issue when I accelerate. Initially I thought it was brakes as it would squeak when I would brake. Took it to dealership, and it was resolved when they installed new brake pads and rotors.
Immediately after picking up my vehicle and driving it back home, I noticed the sound was gone when I would brake. But there was a new sound when I would accelerate and it appears to be coming from the engine. Took it back to the dealership twice now and they cannot seem to find the issue, but do acknowledge that there is a noise. They checked EVERYTHING and said it’s good, including all belts and pulleys. In fact they even lubed up the belts the 2nd time around thinking the noise would go away but it didn’t.
Attaching 2 short videos for reference of the sound which you can hear at the beginning as I begin to accelerate. It continues and never stops, but due to the size and length I cut the clips short.
ANY help is much appreciated.
I am having a noise issue when I accelerate. Initially I thought it was brakes as it would squeak when I would brake. Took it to dealership, and it was resolved when they installed new brake pads and rotors.
Immediately after picking up my vehicle and driving it back home, I noticed the sound was gone when I would brake. But there was a new sound when I would accelerate and it appears to be coming from the engine. Took it back to the dealership twice now and they cannot seem to find the issue, but do acknowledge that there is a noise. They checked EVERYTHING and said it’s good, including all belts and pulleys. In fact they even lubed up the belts the 2nd time around thinking the noise would go away but it didn’t.
Attaching 2 short videos for reference of the sound which you can hear at the beginning as I begin to accelerate. It continues and never stops, but due to the size and length I cut the clips short.
ANY help is much appreciated.
Thread Starter
Junior Member
Joined: Feb 2023
Posts: 16
Likes: 1
From: New York
2011 E350
Coincidentally, I am having the same issue again which appears to be coming from the rear rotors/brake pads.
Last edited by Tennislegend; Nov 27, 2024 at 07:59 AM.
