~85hp loss 2017 c43
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Newbie
Joined: Aug 2024
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W205 c43
~85hp loss 2017 c43
Hi all,
I been lurking these forums for a while, its time for my first post. I need help with my car, like the title says I been getting less power in the past month or so.
I first noticed it was a bit slower and thought I was crazy. Decided to run some 0-100km, preciousky my time was close to 4.8 - 5, this time around couldnt get it under 6.92.
I took it to the dealership and the mechanic said it seems like the car is shifting at 5800 instead of recline. He did some software update and was able to get the car to around 270hp when I bought it in it was around 260. The mufflers are removed( I plan on putting them back on) the mechanic at the dealership said "lack of back pressure from no mufflers is probably causing the rest if the powerless so put them back on and if issue persists bring it back".
I find it hard to believe lack if backpressure would have the power that significantly. Any ideas what this could be ?
Currently has 85000km spark plugs were changed at 83k.
I noticed the turbo gauge flutters a lot more and I can't seem to build brake boost. I mentioned this to the dealership and they claim.if anything was wrong with the turbo there would be an engine light so nothing is wrong.
Any help is appreciated!
TL;DR: car shifts at 5800 manual mode or not, hp number float close to 270 but go anywhere near what they used to.
I been lurking these forums for a while, its time for my first post. I need help with my car, like the title says I been getting less power in the past month or so.
I first noticed it was a bit slower and thought I was crazy. Decided to run some 0-100km, preciousky my time was close to 4.8 - 5, this time around couldnt get it under 6.92.
I took it to the dealership and the mechanic said it seems like the car is shifting at 5800 instead of recline. He did some software update and was able to get the car to around 270hp when I bought it in it was around 260. The mufflers are removed( I plan on putting them back on) the mechanic at the dealership said "lack of back pressure from no mufflers is probably causing the rest if the powerless so put them back on and if issue persists bring it back".
I find it hard to believe lack if backpressure would have the power that significantly. Any ideas what this could be ?
Currently has 85000km spark plugs were changed at 83k.
I noticed the turbo gauge flutters a lot more and I can't seem to build brake boost. I mentioned this to the dealership and they claim.if anything was wrong with the turbo there would be an engine light so nothing is wrong.
Any help is appreciated!
TL;DR: car shifts at 5800 manual mode or not, hp number float close to 270 but go anywhere near what they used to.
MBWorld God!
Joined: Dec 2019
Posts: 32,536
Likes: 6,358
Hi all,
I been lurking these forums for a while, its time for my first post. I need help with my car, like the title says I been getting less power in the past month or so.
I first noticed it was a bit slower and thought I was crazy. Decided to run some 0-100km, preciousky my time was close to 4.8 - 5, this time around couldnt get it under 6.92.
I took it to the dealership and the mechanic said it seems like the car is shifting at 5800 instead of recline. He did some software update and was able to get the car to around 270hp when I bought it in it was around 260. The mufflers are removed( I plan on putting them back on) the mechanic at the dealership said "lack of back pressure from no mufflers is probably causing the rest if the powerless so put them back on and if issue persists bring it back".
I find it hard to believe lack if backpressure would have the power that significantly. Any ideas what this could be ?
Currently has 85000km spark plugs were changed at 83k.
I noticed the turbo gauge flutters a lot more and I can't seem to build brake boost. I mentioned this to the dealership and they claim.if anything was wrong with the turbo there would be an engine light so nothing is wrong.
Any help is appreciated!
TL;DR: car shifts at 5800 manual mode or not, hp number float close to 270 but go anywhere near what they used to.
I been lurking these forums for a while, its time for my first post. I need help with my car, like the title says I been getting less power in the past month or so.
I first noticed it was a bit slower and thought I was crazy. Decided to run some 0-100km, preciousky my time was close to 4.8 - 5, this time around couldnt get it under 6.92.
I took it to the dealership and the mechanic said it seems like the car is shifting at 5800 instead of recline. He did some software update and was able to get the car to around 270hp when I bought it in it was around 260. The mufflers are removed( I plan on putting them back on) the mechanic at the dealership said "lack of back pressure from no mufflers is probably causing the rest if the powerless so put them back on and if issue persists bring it back".
I find it hard to believe lack if backpressure would have the power that significantly. Any ideas what this could be ?
Currently has 85000km spark plugs were changed at 83k.
I noticed the turbo gauge flutters a lot more and I can't seem to build brake boost. I mentioned this to the dealership and they claim.if anything was wrong with the turbo there would be an engine light so nothing is wrong.
Any help is appreciated!
TL;DR: car shifts at 5800 manual mode or not, hp number float close to 270 but go anywhere near what they used to.
Thread Starter
Newbie
Joined: Aug 2024
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W205 c43
the dealership told me they ran all the codes and nothing came up.
Newbie
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C43 AMG
I just changed both parts the other day because my car was doing 0-100 kmh in 5.6 seconds and took a long time to blow up. Also turbo control valve was making these sounds - https://drive.google.com/file/d/1VYr...21or4GL3J/view.
After changing it doing 4.6-4.8 sec to 100 kmh
The turbo control valve part number is A0001531800, check valve just some good one but make sure it's 3mm because I bought 5mm and it was too big.
Last edited by cheerfulxo; Aug 30, 2024 at 02:27 PM.
MBWorld God!
Joined: Dec 2019
Posts: 32,536
Likes: 6,358
hmm this might be it, my car had an issue a while ago which caused it to go into limp mode. I took it to the garage they checked everything cleared the codes and the car hasnt been in hard limp ever since. I'm starting to thing what if it's been in soft limp this whole time.
the dealership told me they ran all the codes and nothing came up.
the dealership told me they ran all the codes and nothing came up.
What you describe sounds very much like a problem with the turbo control and check valves. This video will explain the problem - youtu.be/XGa1R5uK54k?si=TAcyFPg-XL9dKQxd
I just changed both parts the other day because my car was doing 0-100 kmh in 5.6 seconds and took a long time to blow up. Also turbo control valve was making these sounds - drive.google.com/file/d/1VYrj8JGnD1Qj9MUOYc65MiB21or4GL3J/view.
After changing it doing 4.6-4.8 sec to 100 kmh
The turbo control valve part number is A0001531800, check valve just some good one but make sure it's 3mm because I bought 5mm and it was too big.
I just changed both parts the other day because my car was doing 0-100 kmh in 5.6 seconds and took a long time to blow up. Also turbo control valve was making these sounds - drive.google.com/file/d/1VYrj8JGnD1Qj9MUOYc65MiB21or4GL3J/view.
After changing it doing 4.6-4.8 sec to 100 kmh
The turbo control valve part number is A0001531800, check valve just some good one but make sure it's 3mm because I bought 5mm and it was too big.
Thanks for chiming in, hopefully that solves OP's issue.
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Thread Starter
Newbie
Joined: Aug 2024
Posts: 12
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W205 c43
What you describe sounds very much like a problem with the turbo control and check valves. This video will explain the problem - https://youtu.be/XGa1R5uK54k?si=TAcyFPg-XL9dKQxd
I just changed both parts the other day because my car was doing 0-100 kmh in 5.6 seconds and took a long time to blow up. Also turbo control valve was making these sounds - https://drive.google.com/file/d/1VYr...21or4GL3J/view.
After changing it doing 4.6-4.8 sec to 100 kmh
The turbo control valve part number is A0001531800, check valve just some good one but make sure it's 3mm because I bought 5mm and it was too big.
I just changed both parts the other day because my car was doing 0-100 kmh in 5.6 seconds and took a long time to blow up. Also turbo control valve was making these sounds - https://drive.google.com/file/d/1VYr...21or4GL3J/view.
After changing it doing 4.6-4.8 sec to 100 kmh
The turbo control valve part number is A0001531800, check valve just some good one but make sure it's 3mm because I bought 5mm and it was too big.
Also on a side note I am now able to build brake boost and the flutters seems to have been corrected with the software updates.
I got a creader elite coming in today hoping to see if any codes comes up.
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Thread Starter
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Joined: Aug 2024
Posts: 12
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W205 c43
No worries man i appreciate the help. Ill be trying the suggestion above. I also called a performance shop in my city and they recommend to bring it in for a compression test and smoke test for like 500 CAD. Not sure if that's a good prive or not
MBWorld God!
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Thread Starter
Newbie
Joined: Aug 2024
Posts: 12
Likes: 0
W205 c43
What you describe sounds very much like a problem with the turbo control and check valves. This video will explain the problem - https://youtu.be/XGa1R5uK54k?si=TAcyFPg-XL9dKQxd
I just changed both parts the other day because my car was doing 0-100 kmh in 5.6 seconds and took a long time to blow up. Also turbo control valve was making these sounds - https://drive.google.com/file/d/1VYr...21or4GL3J/view.
After changing it doing 4.6-4.8 sec to 100 kmh
The turbo control valve part number is A0001531800, check valve just some good one but make sure it's 3mm because I bought 5mm and it was too big.
I just changed both parts the other day because my car was doing 0-100 kmh in 5.6 seconds and took a long time to blow up. Also turbo control valve was making these sounds - https://drive.google.com/file/d/1VYr...21or4GL3J/view.
After changing it doing 4.6-4.8 sec to 100 kmh
The turbo control valve part number is A0001531800, check valve just some good one but make sure it's 3mm because I bought 5mm and it was too big.
Omg I think you solved it brother! I don't have the fart noises but there definitely oil coming out of the check valve here's a video https://drive.google.com/file/d/1rAQ...w?usp=drivesdk
How do I differentiate a good check valve from a ba done ? A quick search only shows me valves for like 10-20$ in the video he mentions a volvo valve couldn't seem to find any. Is there a part number ?
Thank you so much for the help!!
Newbie
Joined: Aug 2024
Posts: 5
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2020 C43 Coupe
Omg I think you solved it brother! I don't have the fart noises but there definitely oil coming out of the check valve here's a video https://drive.google.com/file/d/1rAQ...w?usp=drivesdk
How do I differentiate a good check valve from a ba done ? A quick search only shows me valves for like 10-20$ in the video he mentions a volvo valve couldn't seem to find any. Is there a part number ?
Thank you so much for the help!!
How do I differentiate a good check valve from a ba done ? A quick search only shows me valves for like 10-20$ in the video he mentions a volvo valve couldn't seem to find any. Is there a part number ?
Thank you so much for the help!!
Newbie
Joined: Aug 2024
Posts: 8
Likes: 0
C43 AMG
Hi all,
I been lurking these forums for a while, its time for my first post. I need help with my car, like the title says I been getting less power in the past month or so.
I first noticed it was a bit slower and thought I was crazy. Decided to run some 0-100km, preciousky my time was close to 4.8 - 5, this time around couldnt get it under 6.92.
I took it to the dealership and the mechanic said it seems like the car is shifting at 5800 instead of recline. He did some software update and was able to get the car to around 270hp when I bought it in it was around 260. The mufflers are removed( I plan on putting them back on) the mechanic at the dealership said "lack of back pressure from no mufflers is probably causing the rest if the powerless so put them back on and if issue persists bring it back".
I find it hard to believe lack if backpressure would have the power that significantly. Any ideas what this could be ?
Currently has 85000km spark plugs were changed at 83k.
I noticed the turbo gauge flutters a lot more and I can't seem to build brake boost. I mentioned this to the dealership and they claim.if anything was wrong with the turbo there would be an engine light so nothing is wrong.
Any help is appreciated!
TL;DR: car shifts at 5800 manual mode or not, hp number float close to 270 but go anywhere near what they used to.
I been lurking these forums for a while, its time for my first post. I need help with my car, like the title says I been getting less power in the past month or so.
I first noticed it was a bit slower and thought I was crazy. Decided to run some 0-100km, preciousky my time was close to 4.8 - 5, this time around couldnt get it under 6.92.
I took it to the dealership and the mechanic said it seems like the car is shifting at 5800 instead of recline. He did some software update and was able to get the car to around 270hp when I bought it in it was around 260. The mufflers are removed( I plan on putting them back on) the mechanic at the dealership said "lack of back pressure from no mufflers is probably causing the rest if the powerless so put them back on and if issue persists bring it back".
I find it hard to believe lack if backpressure would have the power that significantly. Any ideas what this could be ?
Currently has 85000km spark plugs were changed at 83k.
I noticed the turbo gauge flutters a lot more and I can't seem to build brake boost. I mentioned this to the dealership and they claim.if anything was wrong with the turbo there would be an engine light so nothing is wrong.
Any help is appreciated!
TL;DR: car shifts at 5800 manual mode or not, hp number float close to 270 but go anywhere near what they used to.
Omg I think you solved it brother! I don't have the fart noises but there definitely oil coming out of the check valve here's a video https://drive.google.com/file/d/1rAQ...w?usp=drivesdk
How do I differentiate a good check valve from a ba done ? A quick search only shows me valves for like 10-20$ in the video he mentions a volvo valve couldn't seem to find any. Is there a part number ?
Thank you so much for the help!!
How do I differentiate a good check valve from a ba done ? A quick search only shows me valves for like 10-20$ in the video he mentions a volvo valve couldn't seem to find any. Is there a part number ?
Thank you so much for the help!!
MBWorld Fanatic!
Joined: Dec 2011
Posts: 1,733
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From: Spain UTC/GMT +2 hours
W213 All-terrain
Hi all,
I been lurking these forums for a while, its time for my first post. I need help with my car, like the title says I been getting less power in the past month or so.
I first noticed it was a bit slower and thought I was crazy. Decided to run some 0-100km, preciousky my time was close to 4.8 - 5, this time around couldnt get it under 6.92.
I took it to the dealership and the mechanic said it seems like the car is shifting at 5800 instead of recline. He did some software update and was able to get the car to around 270hp when I bought it in it was around 260. The mufflers are removed( I plan on putting them back on) the mechanic at the dealership said "lack of back pressure from no mufflers is probably causing the rest if the powerless so put them back on and if issue persists bring it back".
I find it hard to believe lack if backpressure would have the power that significantly. Any ideas what this could be ?
Currently has 85000km spark plugs were changed at 83k.
I noticed the turbo gauge flutters a lot more and I can't seem to build brake boost. I mentioned this to the dealership and they claim.if anything was wrong with the turbo there would be an engine light so nothing is wrong.
Any help is appreciated!
TL;DR: car shifts at 5800 manual mode or not, hp number float close to 270 but go anywhere near what they used to.
I been lurking these forums for a while, its time for my first post. I need help with my car, like the title says I been getting less power in the past month or so.
I first noticed it was a bit slower and thought I was crazy. Decided to run some 0-100km, preciousky my time was close to 4.8 - 5, this time around couldnt get it under 6.92.
I took it to the dealership and the mechanic said it seems like the car is shifting at 5800 instead of recline. He did some software update and was able to get the car to around 270hp when I bought it in it was around 260. The mufflers are removed( I plan on putting them back on) the mechanic at the dealership said "lack of back pressure from no mufflers is probably causing the rest if the powerless so put them back on and if issue persists bring it back".
I find it hard to believe lack if backpressure would have the power that significantly. Any ideas what this could be ?
Currently has 85000km spark plugs were changed at 83k.
I noticed the turbo gauge flutters a lot more and I can't seem to build brake boost. I mentioned this to the dealership and they claim.if anything was wrong with the turbo there would be an engine light so nothing is wrong.
Any help is appreciated!
TL;DR: car shifts at 5800 manual mode or not, hp number float close to 270 but go anywhere near what they used to.
Turbo is just a transformer, it transform the exhaust energy into the intake energy. With a loss, of course. So you can monitor the back pressure with any diag system. The value should be higher than intake pressure
Thread Starter
Newbie
Joined: Aug 2024
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W205 c43
You're welcome, I got the OEM check valve, but since it goes as a repair package they don't have a part number (The service station sold it to me). Klifex is also a good option, I bought it but it was wrong so I returned it (I Chose Volvo not Mercedes and the Volvo one is bigger)
I ordered a klifex valve which only get here next week, so in the meantime I got a replacement from amazon and installed it today.
Its making a weird nose when I unplug the vaccum line from it. See video below:
https://drive.google.com/file/d/1s5k...usp=drive_link
Other than I did notice some torque gains and the boost is a lot more consistent not perfect but better. When I pull the vacuum line out the valve is sucking air in. thats the right direction right?
Thread Starter
Newbie
Joined: Aug 2024
Posts: 12
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W205 c43
The back pressure is needed for building the turbo boost, without back pressure the gases will not be forced to spin your turbine and will be free to go outside.
Turbo is just a transformer, it transform the exhaust energy into the intake energy. With a loss, of course. So you can monitor the back pressure with any diag system. The value should be higher than intake pressure
Turbo is just a transformer, it transform the exhaust energy into the intake energy. With a loss, of course. So you can monitor the back pressure with any diag system. The value should be higher than intake pressure
MBWorld Fanatic!
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W213 All-terrain
But without, why the gases will choose turbo impeller instead of getting free outside. Imagine a dam for forcing water to spin the turbine from power station
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'16 AMG GTS, '21 AMG GLE53
If issue creeps back up, could be wastegates at that mileage. I had loads of play in mine and dealer and Indy shop both said it was the culprit for no boost/no CEL condition. Boost would flatline and not come back til you restarted the car. Sometimes I could go all day after a restart and make full power, others it would never maintain. Indy said there’s no rebuild process or wastegate parts for M276 turbos so it was full replacement of both at $11,500
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W205 C43
I may be late on this, but when i first got mine, it was hardstuck at right around 270hp (like in your first post) and low 300s for ft lb torque. No CEL. The dealer DID tell me when i picked up the PE exhaust flap on one side was broken (which they fixed the following week after waiting on the part). Thought it would solve the issue but was STILL at those numbers. Took to the trusted MB indy place and they said the spring on the OTHER side was bad. About $90-100 and 1 hr later it was all fixed and back to the 362/384 numbers on engine data screen. You had mentioned the mufflers were taken off, so that was my first initial thought.
Looks like you have had good help on this already and hope you get it resolved asap!
Looks like you have had good help on this already and hope you get it resolved asap!
MBWorld God!
Joined: Dec 2019
Posts: 32,536
Likes: 6,358
I may be late on this, but when i first got mine, it was hardstuck at right around 270hp (like in your first post) and low 300s for ft lb torque. No CEL. The dealer DID tell me when i picked up the PE exhaust flap on one side was broken (which they fixed the following week after waiting on the part). Thought it would solve the issue but was STILL at those numbers. Took to the trusted MB indy place and they said the spring on the OTHER side was bad. About $90-100 and 1 hr later it was all fixed and back to the 362/384 numbers on engine data screen. You had mentioned the mufflers were taken off, so that was my first initial thought.
Looks like you have had good help on this already and hope you get it resolved asap!
Looks like you have had good help on this already and hope you get it resolved asap!
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Joined: Dec 2025
Posts: 31
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C43
