Problem c450 help
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Joined: Sep 2020
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From: España
C450
Problem c450 help
I’m having a problem with my Mercedes C450 AMG. The car used to run fine, but for some time now, when I lift off the accelerator, there’s a noise coming from the left side of the engine, as if something were loose. At the workshop they told me it’s something related to the turbo — the linkage/rods — and that the turbo needs to be replaced.
Also, when I try to do a 0–100 launch, the car goes into limp mode and loses power. We even tried changing the tune/remap, but it still does the same thing. At this point I don’t know what else to do.
And to make matters worse, we changed the water pump and the thermostat, but sometimes the oil temperature and coolant temperature drop, and it takes a while for them to stabilize.
The car pulls well and accelerates strongly during normal driving. It regains speed without any problem. The issue only happens when I try to use launch control.
I feel really frustrated. I keep replacing parts, but we still can’t figure out what the problem is. I’m from Spain.
Also, when I try to do a 0–100 launch, the car goes into limp mode and loses power. We even tried changing the tune/remap, but it still does the same thing. At this point I don’t know what else to do.
And to make matters worse, we changed the water pump and the thermostat, but sometimes the oil temperature and coolant temperature drop, and it takes a while for them to stabilize.
The car pulls well and accelerates strongly during normal driving. It regains speed without any problem. The issue only happens when I try to use launch control.
I feel really frustrated. I keep replacing parts, but we still can’t figure out what the problem is. I’m from Spain.
Last edited by guillelrd; May 2, 2026 at 06:11 PM.
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I’m having a problem with my Mercedes C450 AMG. The car used to run fine, but for some time now, when I lift off the accelerator, there’s a noise coming from the left side of the engine, as if something were loose. At the workshop they told me it’s something related to the turbo — the linkage/rods — and that the turbo needs to be replaced.
Also, when I try to do a 0–100 launch, the car goes into limp mode and loses power. We even tried changing the tune/remap, but it still does the same thing. At this point I don’t know what else to do.
And to make matters worse, we changed the water pump and the thermostat, but sometimes the oil temperature and coolant temperature drop, and it takes a while for them to stabilize.
The car pulls well and accelerates strongly during normal driving. It regains speed without any problem. The issue only happens when I try to use launch control.
I feel really frustrated. I keep replacing parts, but we still can’t figure out what the problem is. I’m from Spain.
Also, when I try to do a 0–100 launch, the car goes into limp mode and loses power. We even tried changing the tune/remap, but it still does the same thing. At this point I don’t know what else to do.
And to make matters worse, we changed the water pump and the thermostat, but sometimes the oil temperature and coolant temperature drop, and it takes a while for them to stabilize.
The car pulls well and accelerates strongly during normal driving. It regains speed without any problem. The issue only happens when I try to use launch control.
I feel really frustrated. I keep replacing parts, but we still can’t figure out what the problem is. I’m from Spain.
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As always a difficult question requires a person with expertise @CaliBenzDriver
Thread Starter
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From: España
C450
Out Of Control!!
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
tuned 276 racing
As always a difficult question requires a person with expertise @CaliBenzDriver
- inspect vacuum pump check-valve.
- empty oil from wastegate diaphragms
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MBWorld God!
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Thread Starter
Junior Member
Joined: Sep 2020
Posts: 34
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From: España
C450
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Sorry for the confusion but you quoted the wrong person, all credits goes to forum member CaliBenzDriver.
MBWorld God!
Joined: Dec 2019
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Likes: 6,275
MBWorld God!
Joined: Dec 2019
Posts: 32,217
Likes: 6,275
As for the check valve:
https://mbworld.org/forums/w212-amg/...ve-repair.html
Have a look at this as well:
https://mbworld.org/forums/e-class-c...e-upgrade.html
As for buying a check valve directly from pump manufacturer https://klifex.com/mercedes-vacuum-p...365-2762300265
https://mbworld.org/forums/w212-amg/...ve-repair.html
Have a look at this as well:
https://mbworld.org/forums/e-class-c...e-upgrade.html
As for buying a check valve directly from pump manufacturer https://klifex.com/mercedes-vacuum-p...365-2762300265
