W220 2006 S65 -- Whining / Whirring / Buzzing Sound in Engine Bay (Driver's Side)
Thread Starter
Junior Member
Joined: May 2016
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2006 S65; 2005 S600
W220 2006 S65 -- Whining / Whirring / Buzzing Sound in Engine Bay (Driver's Side)
The car, a W220 2006 S65, has 51k miles and is healthy and well maintained. After a spirited drive where the car was pushed to its limits, it developed a whining sound in the engine bay that changes tone with the RPMs. It almost sounds like a supercharger whine. A few videos:
1.
2.
Searching this forum, it sounds like the issue may be an ABC accumulator, but these posts are specific to the S55:
1. https://mbworld.org/forums/s55-amg-s...r-whining.html
2. https://mbworld.org/forums/s55-amg-s...need-help.html
Any tips would be appreciated.
1.
Searching this forum, it sounds like the issue may be an ABC accumulator, but these posts are specific to the S55:
1. https://mbworld.org/forums/s55-amg-s...r-whining.html
2. https://mbworld.org/forums/s55-amg-s...need-help.html
Any tips would be appreciated.
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Joined: Feb 2012
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From: Phoenix
222 S-65
Pulse dampener for ABC comes to mind.
Every time I have had one fail the reservoir is covered with ABC oil that has just been pushed out by the nitrogen bomb having a failure of its bladder.
Every time I have had one fail the reservoir is covered with ABC oil that has just been pushed out by the nitrogen bomb having a failure of its bladder.
Last edited by JohnLane; Nov 25, 2023 at 08:06 AM.
Senior Member
Joined: Aug 2010
Posts: 359
Likes: 291
From: Rockport, TX
2007 S65 AMG-Sold, 2007 SL55 P030 - 2016 GL450 - - 2017 AMG GTS - Sold - 2015 AMG S65
Judging by the sound produced by your video, the whining sound is coming from the combo ABC/Power steering pump. Did you check the fluid levels in their respective reservoirs?
Use an automotive stethoscope or long screwdriver touched to the body of the pump and connect it to your ear(s) and have rev the car and see if you can pick up the location of the sound.
Use an automotive stethoscope or long screwdriver touched to the body of the pump and connect it to your ear(s) and have rev the car and see if you can pick up the location of the sound.
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'06 MB S55 AMG; '04 Audi Allroad 4.2; '05 BMW M3 Conv.; '92 MB 500E
Tandem pump sounds near dry. Also, what are the conditions of your engine and transmission mounts. Sounds like they're resting on the chassis somewhere. I can't imagine that's not vibrating. If vibrations as well, check mounts. If no vibrations, then isolated to tandem pump.
What did you see when you checked the ABC fluid level?
maw
What did you see when you checked the ABC fluid level?
maw
Thread Starter
Junior Member
Joined: May 2016
Posts: 15
Likes: 3
2006 S65; 2005 S600
Thank you all for your suggestions. The tandem pump did have enough oil in it, so that wasn't the cause of the noise.
I had the sound diagnosed as coming from the ABC pump, but no specifics beyond that. The pump seems to be working fine, no leaks, no error codes, and the suspension raises and lowers with the button. My gut feeling is that the pump is okay and the sound may be coming from the Pulsation Damper.
The mechanic is not as experienced with ABC suspensions as I had hoped (even though is this is a highly respected Euro shop) so I will be taking it elsewhere for another opinion. If anyone knows a good Benz mechanic in the DFW area, please let me know.
I had the sound diagnosed as coming from the ABC pump, but no specifics beyond that. The pump seems to be working fine, no leaks, no error codes, and the suspension raises and lowers with the button. My gut feeling is that the pump is okay and the sound may be coming from the Pulsation Damper.
The mechanic is not as experienced with ABC suspensions as I had hoped (even though is this is a highly respected Euro shop) so I will be taking it elsewhere for another opinion. If anyone knows a good Benz mechanic in the DFW area, please let me know.
Last edited by alexio senchez; Dec 23, 2023 at 01:19 AM.
Senior Member
Joined: Aug 2010
Posts: 359
Likes: 291
From: Rockport, TX
2007 S65 AMG-Sold, 2007 SL55 P030 - 2016 GL450 - - 2017 AMG GTS - Sold - 2015 AMG S65
Call
Thank you all for your suggestions. I pump did not sufficient oil in it.
I had the sound diagnosed as coming from the ABC pump, but no specifics beyond that. The pump seems to be working fine, no leaks, no error codes, and the suspension raises and lowers with the button. My gut feeling is that the pump is okay and the sound may be coming from the Pulsation Damper.
The mechanic is not as experienced with ABC suspensions as I had hoped (even though is this is a highly respected Euro shop) so I will be taking it elsewhere for another opinion. If anyone knows a good Benz mechanic in the DFW area, please let me know.
I had the sound diagnosed as coming from the ABC pump, but no specifics beyond that. The pump seems to be working fine, no leaks, no error codes, and the suspension raises and lowers with the button. My gut feeling is that the pump is okay and the sound may be coming from the Pulsation Damper.
The mechanic is not as experienced with ABC suspensions as I had hoped (even though is this is a highly respected Euro shop) so I will be taking it elsewhere for another opinion. If anyone knows a good Benz mechanic in the DFW area, please let me know.
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Joined: Aug 2007
Posts: 1,833
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From: Pacific Northwest
2001 S600 V12 Sold, 2011 Jaguar XFR Sold, 2017 S550 4-Matic, 2018 S63 AMG Sedan
This problem cost me close to $6K to fix back when I had my S600, but this was almost 15 years ago. Nobody knew how to figure out what the heck was wrong with it; it was the pulsation damper. Actually not that difficult to fix, harder to find someone comfortable with it.
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MBWorld Fanatic!
Joined: Apr 2009
Posts: 1,264
Likes: 367
'06 MB S55 AMG; '04 Audi Allroad 4.2; '05 BMW M3 Conv.; '92 MB 500E
This problem cost me close to $6K to fix back when I had my S600, but this was almost 15 years ago. Nobody knew how to figure out what the heck was wrong with it; it was the pulsation damper. Actually not that difficult to fix, harder to find someone comfortable with it.
mww
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