W221 S500 M273 noise
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Junior Member
Joined: Oct 2022
Posts: 17
Likes: 3
MB S500L 2006 (W221)
W221 S500 M273 noise
I have a 2006 500S(S550) M273 on the engine. Mileage 360,000km. It runs just fine, the power is there and the consumption is not so bad now... But
When accelerating, especially if you're going uphill at around 3000rms, you can hear a wonderful knocking. The sound can also be heard
standing still, but a much softer sound. As if it were coming from below. When the engine is cold, there is almost no sound.
Replaced, all roller, alternator, water pump, multi-groove and it doesn't seem like it's part of the auxiliary equipment, although I doubt the ABC pump a bit.
What could be the reason?
When accelerating, especially if you're going uphill at around 3000rms, you can hear a wonderful knocking. The sound can also be heard
standing still, but a much softer sound. As if it were coming from below. When the engine is cold, there is almost no sound.
Replaced, all roller, alternator, water pump, multi-groove and it doesn't seem like it's part of the auxiliary equipment, although I doubt the ABC pump a bit.
What could be the reason?
Super Member
Joined: Dec 2018
Posts: 857
Likes: 501
From: Washington, DC
2007 S600, 2007 Chrysler 300 SRT8, 2000 C5 Corvette, 2017 Mustang GT, 2023 300C, and a 2019 Lincoln
Any diagnostic codes? It sounds to me like a bad anti-knock sensor. Are you using high octane fuel? Check codes and keep us posted.
MBWorld Fanatic!
Joined: Oct 2010
Posts: 5,141
Likes: 1,293
From: Southern US
2010 E550, 273 Engine: 2012 S550, 278 Engine
I have a 2006 500S(S550) M273 on the engine. Mileage 360,000km. It runs just fine, the power is there and the consumption is not so bad now... But
When accelerating, especially if you're going uphill at around 3000rms, you can hear a wonderful knocking. The sound can also be heard
standing still, but a much softer sound. As if it were coming from below. When the engine is cold, there is almost no sound.
Replaced, all roller, alternator, water pump, multi-groove and it doesn't seem like it's part of the auxiliary equipment, although I doubt the ABC pump a bit.
What could be the reason?
When accelerating, especially if you're going uphill at around 3000rms, you can hear a wonderful knocking. The sound can also be heard
standing still, but a much softer sound. As if it were coming from below. When the engine is cold, there is almost no sound.
Replaced, all roller, alternator, water pump, multi-groove and it doesn't seem like it's part of the auxiliary equipment, although I doubt the ABC pump a bit.
What could be the reason?
I still don't know how this would cause the sound under acceleration but it did.
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Joined: Apr 2021
Posts: 846
Likes: 559
From: San Jose, CA
11 E550, 16 AMG GTS, 13 S550
yeah i can't tell you whats going on til I see under the car, could be driveshaft couplers, suspension, strut mounts, BJ's, etc. congratulations on a long life with that car btw
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