Looking for any ideas as MB techs seem clueless
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2019 C43 AMG
Looking for any ideas as MB techs seem clueless
I have loved my Mercedes (owned a 2016 CLA45, 2018 C43 and now a 2019 C43.
Mysterious Grinding noise:
Timeline since November 10th with local MB dealership here in Calgary trying to fix it:
- Replaced drive shaft centre bearing and rubber mount
- Replaced the left turbo charger assembly, diverter and right side diverter
- Replaced the front axle propeller shaft assembly
- Replace intake and exhaust cam solenoids
- Replaced transmission assembly without the torque converter
- Replaced transmission torque converter
- Replaced flywheel bolts
- Replaced front propeller shaft bolts
Noise is still present and is getting worse which has been acknowledged and confirmed by technician on January 5th 2021.
Not sure what to think anymore and they still have no idea what is causing the noise.
Mysterious Grinding noise:
Timeline since November 10th with local MB dealership here in Calgary trying to fix it:
- Replaced drive shaft centre bearing and rubber mount
- Replaced the left turbo charger assembly, diverter and right side diverter
- Replaced the front axle propeller shaft assembly
- Replace intake and exhaust cam solenoids
- Replaced transmission assembly without the torque converter
- Replaced transmission torque converter
- Replaced flywheel bolts
- Replaced front propeller shaft bolts
Noise is still present and is getting worse which has been acknowledged and confirmed by technician on January 5th 2021.
Not sure what to think anymore and they still have no idea what is causing the noise.
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2019 C43 AMG
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A thought ... my C63 S had some strange buzzing-like noises under certain types of acceleration in lower gears. I suspected vibrating under panels and/or heat shields. After talking to the (excellent) shop foreman at my dealership, he indicated that that type of problem does occur.
Since it was faster/easier for me to look/adjust/test, the next time I did an oil change, I carefully examined the under panels and heat shields, tapping them at various points to see whether they'd vibrate against adjacent pieces. Wherever I found suspect places -- primarily multiple heat shield locations -- I adjusted the clearance and/or made sure the fastener was properly holding. One of the "center expanding plastic insert thingie fasteners" was loose so I replaced it with a larger one. For my case, that session completely eliminated the buzzing-like noise.
Since it was faster/easier for me to look/adjust/test, the next time I did an oil change, I carefully examined the under panels and heat shields, tapping them at various points to see whether they'd vibrate against adjacent pieces. Wherever I found suspect places -- primarily multiple heat shield locations -- I adjusted the clearance and/or made sure the fastener was properly holding. One of the "center expanding plastic insert thingie fasteners" was loose so I replaced it with a larger one. For my case, that session completely eliminated the buzzing-like noise.
Thread Starter
Member
Joined: Mar 2018
Posts: 198
Likes: 40
2019 C43 AMG
A thought ... my C63 S had some strange buzzing-like noises under certain types of acceleration in lower gears. I suspected vibrating under panels and/or heat shields. After talking to the (excellent) shop foreman at my dealership, he indicated that that type of problem does occur.
Since it was faster/easier for me to look/adjust/test, the next time I did an oil change, I carefully examined the under panels and heat shields, tapping them at various points to see whether they'd vibrate against adjacent pieces. Wherever I found suspect places -- primarily multiple heat shield locations -- I adjusted the clearance and/or made sure the fastener was properly holding. One of the "center expanding plastic insert thingie fasteners" was loose so I replaced it with a larger one. For my case, that session completely eliminated the buzzing-like noise.
Since it was faster/easier for me to look/adjust/test, the next time I did an oil change, I carefully examined the under panels and heat shields, tapping them at various points to see whether they'd vibrate against adjacent pieces. Wherever I found suspect places -- primarily multiple heat shield locations -- I adjusted the clearance and/or made sure the fastener was properly holding. One of the "center expanding plastic insert thingie fasteners" was loose so I replaced it with a larger one. For my case, that session completely eliminated the buzzing-like noise.
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C190
I have loved my Mercedes (owned a 2016 CLA45, 2018 C43 and now a 2019 C43.
Mysterious Grinding noise: https://youtu.be/LGqSwAXVlRM
Timeline since November 10th with local MB dealership here in Calgary trying to fix it:
- Replaced drive shaft centre bearing and rubber mount
- Replaced the left turbo charger assembly, diverter and right side diverter
- Replaced the front axle propeller shaft assembly
- Replace intake and exhaust cam solenoids
- Replaced transmission assembly without the torque converter
- Replaced transmission torque converter
- Replaced flywheel bolts
- Replaced front propeller shaft bolts
Noise is still present and is getting worse which has been acknowledged and confirmed by technician on January 5th 2021.
Not sure what to think anymore and they still have no idea what is causing the noise.
Mysterious Grinding noise: https://youtu.be/LGqSwAXVlRM
Timeline since November 10th with local MB dealership here in Calgary trying to fix it:
- Replaced drive shaft centre bearing and rubber mount
- Replaced the left turbo charger assembly, diverter and right side diverter
- Replaced the front axle propeller shaft assembly
- Replace intake and exhaust cam solenoids
- Replaced transmission assembly without the torque converter
- Replaced transmission torque converter
- Replaced flywheel bolts
- Replaced front propeller shaft bolts
Noise is still present and is getting worse which has been acknowledged and confirmed by technician on January 5th 2021.
Not sure what to think anymore and they still have no idea what is causing the noise.
More obvious when you switch the stock air box to an aftermarket intake. If I used a K&N drop in, it was also audible, but just barely.
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2019 C43 AMG
The "grinding" noise which starts around the 4 second mark and happens 3 times consecutively has never happened before. I've had a 2016 CLA45 and a 2018 C43 and never had this noise before. And this noise wasn't present until about 3-4 month ago.
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C190
Are you referring to the blow off?
The "grinding" noise which starts around the 4 second mark and happens 3 times consecutively has never happened before. I've had a 2016 CLA45 and a 2018 C43 and never had this noise before. And this noise wasn't present until about 3-4 month ago.
The "grinding" noise which starts around the 4 second mark and happens 3 times consecutively has never happened before. I've had a 2016 CLA45 and a 2018 C43 and never had this noise before. And this noise wasn't present until about 3-4 month ago.
Do you have an aftermarket air intake installed. It makes it very much more obvious.
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2019 C43 AMG
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C190
Yup, I tend to describe it as groaning and it is repetitive when it occurs. Bad toilet plumbing as I would say on other threads in this forum.
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2019 C43 AMG
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2019 C63CS
I could be wrong, but this sounds like turbo flutter, which is caused by a compressor surge. It's like a choo-choo sound, which is also the slang term for it. Should only occur in an unvented turbocharged engine, or if the diverter valve is not releasing the pressure, but I see they replaced your diverter valves already. Maybe the replacements aren't working correctly, either.
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2019 C43 AMG
I could be wrong, but this sounds like turbo flutter, which is caused by a compressor surge. It's like a choo-choo sound, which is also the slang term for it. Should only occur in an unvented turbocharged engine, or if the diverter valve is not releasing the pressure, but I see they replaced your diverter valves already. Maybe the replacements aren't working correctly, either.
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2019 C63CS
You'd be surprised how often replacement parts arrive defective. They are often carelessly stored in warehouses w/o much packaging or any packaging at all and the shippers are not particularly careful, either. I went through three transmission oil pans on my previous car for example, because the first two were bent when they arrived and leaked. They didn't even install the second one, because they measured it before installing. Third one was finally good. This was with Audi at the time, but it's the same everywhere. They should test it to make sure the valves are actually doing their job.
Last edited by superswiss; Jan 10, 2021 at 09:00 PM.
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2019 C43 AMG
You'd be surprised how often replacement parts arrive defective. They are often carelessly stored in warehouses w/o much packaging or any packaging at all and the shippers are not particularly careful, either. I went through three transmission oil pans on my previous car for example, because the first two were bent when they arrived and leaked. They didn't even install the second one, because they measured it before installing. Third one was finally good. This was with Audi at the time, but it's the same everywhere. They should test it to make sure the valves are actually doing their job.
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2019 C63CS
Well, by now they should have brought in a field engineer, but I understand that's a bit difficult with the current COVID situation. As far as I know MB and others are currently not sending out field engineers. Not sure how your dealership is equipped, but I thought MB corporate was putting video conferencing in place so they can help diagnose and fix issues virtually. In my case above, Audi immediately flew out a field engineer when I brought the car back for the second time and he stayed until the issue was fixed. You should ask for the issue to be escalated. There's a process for that, but I can't remember at the moment what it's called, but if invoked AMG engineers get involved.
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If you remove the baffles inside or use a drop-in panel filter, it also makes it louder.
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2019 C43 AMG
It’s likely a 2019 model thing. Among my C43 group locally, the 2019 models exhibit that behaviour and that’s why none of them run BMS or MST intakes as it makes the awful sound louder. They sound okay on pre-facelift models though.
If you remove the baffles inside or use a drop-in panel filter, it also makes it louder.
If you remove the baffles inside or use a drop-in panel filter, it also makes it louder.
I've had a 2018 C43 and now this 2019 and the noise was non-existent on the 2018. It's not the blow off sound I'm referring to. It's the choo-choo-choo sound at around the 4 second mark.
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Last edited by TModelle; Jan 11, 2021 at 10:35 AM.
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2019 C43 AMG
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2019 C43 AMG
Do you happen to have sound clips of that noise happening on your car you could share?
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2020 C43
i have a 2020 c43 with BMS intakes. I have the exact same sound that you have in your video that starts around 4 seconds. It only happens when I accelerate very lightly and am only partially under load. I thought it was normal and to me it sounds like its the diverter valves opening and closing because you are basically in between building boost(load) and no load releasing pressure.
