W205 Accelerating Noise help

[mansoor82]

Fix found, had vehicle repaired today and the noise is gone.

Can you confirm if the noise was something like this?

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[mansoor82]

Yes confirmed, same noise and same issue on my C180 w205 2014.


Problem has been resolved. The cabin noise was coming in via the steering shaft and its boot (in the driver's footwell).

A tip to diagnose is this: This cabin noise comes in even when the car is stationary, a very subtle ringing (this ringing is definitely coming in from the HPFP). Just rotate the steering a bit and it will change in intensity. This helped me diagnose the problem. Giving dealership a heads-up on the issue saved time and money.

They quickly figured out the problem and ordered new part for me. They even pushed a cloth inside the shaft to test the hypothesis and the noise was gone.

Many people change their HPFP or Wrist Pins because of this issue. It is not so uncommon, many cars are suffering from this issue and people do not know a fix.

Hope this helps!

 

[JamesPGUK]

Yes confirmed, same noise and same issue on my C180 w205 2014.


Problem has been resolved. The cabin noise was coming in via the steering shaft and its boot (in the driver's footwell).

A tip to diagnose is this: This cabin noise comes in even when the car is stationary, a very subtle ringing (this ringing is definitely coming in from the HPFP). Just rotate the steering a bit and it will change in intensity. This helped me diagnose the problem. Giving dealership a heads-up on the issue saved time and money.

They quickly figured out the problem and ordered new part for me. They even pushed a cloth inside the shaft to test the hypothesis and the noise was gone.

Many people change their HPFP or Wrist Pins because of this issue. It is not so uncommon, many cars are suffering from this issue and people do not know a fix.

Hope this helps!

Brilliant, thanks for posting. What was replaced and the cost please.

 

[MrGreedy]

Hi JamesPGUK, listening to the videos, they don't all sound like the same noise to me, and there could be different issues mentioned throughout this thread, which I will try to summarise as:

- Metallic rattle of turbo bypass valve
- Deterioration of one of the sound insulating boots in the driver’s footwell (steering shaft boot is mentioned in Mansoor82’s post, but you would need to check if there were other boots that could have come lose.
- You’re ‘raspberry’ noise. To me, this doesn’t sound the same as the metallic ‘rattle’, and does indeed sound a bit like a raspberry.

To me, just like an actual ‘blowing a raspberry’ sound, I am guessing that this is due to air escaping under pressure i.e. boost from the turbo. I’m not saying that ‘the turbo’ is necessarily the cause, but just that when the turbo is on boost, it creates enough pressure to force air out of somewhere.
If it is boost related, I'm guessing you can't get the car to do it when stationary, as there won't be enough load on the engine/transmission to require sufficiently high boost pressure.

I wouldn’t bother getting Mercedes to diagnose this due to cost and concerns about them being any use, and would definitely look for a local well respected Mercedes Independent garage specialist with STAR.

After a STAR diagnosis and in the event of no solid/certain error codes, the first port of call for me would be looking at anything that might have been disconnected whilst changing a NOx sensor that hasn’t been put back correctly. The Indy will know where to look. If the noise definitely appeared 'during' the NOx work at Mercedes, this is important info as it could help narrow down the likely issue significantly.
Has any exhaust been disconnected and not reconnected correctly? Is the NOx sensor fitted correctly?
After that, I would be checking all the turbo piping and seals for fit and damaged gaskets.

I will say I'm just a home hobbyist DIY mechanic tackling easy jobs. But I've been doing it for a couple of decades and read a lot of the problems and technical posts on here even if I don't have anything to contribute. So if I had to guess, the above is how I would start to track it down.

Good luck and keep us updated.

 

[mansoor82]

Brilliant, thanks for posting. What was replaced and the cost please.

These are the affected parts (taken from Rubb3rduck3d).

However, when I went to pick my car up, they said that they have repaired the steering shaft by introducing an insulation into it and the problem is solved. Saving me tons of money, in fact, I was charged only 30 USD for the repairs. So kudos to the Mercedes dealership in Islamabad for the help. Their senior manager spent considerable amount of time guiding the whole process.

The noise is not there anymore and I am a one happy Merc owner!

 

[JamesPGUK]

Hi JamesPGUK, listening to the videos, they don't all sound like the same noise to me, and there could be different issues mentioned throughout this thread, which I will try to summarise as:

- Metallic rattle of turbo bypass valve
- Deterioration of one of the sound insulating boots in the driver’s footwell (steering shaft boot is mentioned in Mansoor82’s post, but you would need to check if there were other boots that could have come lose.
- You’re ‘raspberry’ noise. To me, this doesn’t sound the same as the metallic ‘rattle’, and does indeed sound a bit like a raspberry.

To me, just like an actual ‘blowing a raspberry’ sound, I am guessing that this is due to air escaping under pressure i.e. boost from the turbo. I’m not saying that ‘the turbo’ is necessarily the cause, but just that when the turbo is on boost, it creates enough pressure to force air out of somewhere.
If it is boost related, I'm guessing you can't get the car to do it when stationary, as there won't be enough load on the engine/transmission to require sufficiently high boost pressure.

I wouldn’t bother getting Mercedes to diagnose this due to cost and concerns about them being any use, and would definitely look for a local well respected Mercedes Independent garage specialist with STAR.

After a STAR diagnosis and in the event of no solid/certain error codes, the first port of call for me would be looking at anything that might have been disconnected whilst changing a NOx sensor that hasn’t been put back correctly. The Indy will know where to look. If the noise definitely appeared 'during' the NOx work at Mercedes, this is important info as it could help narrow down the likely issue significantly.
Has any exhaust been disconnected and not reconnected correctly? Is the NOx sensor fitted correctly?
After that, I would be checking all the turbo piping and seals for fit and damaged gaskets.

I will say I'm just a home hobbyist DIY mechanic tackling easy jobs. But I've been doing it for a couple of decades and read a lot of the problems and technical posts on here even if I don't have anything to contribute. So if I had to guess, the above is how I would start to track it down.

Good luck and keep us updated.

Thanks for taking the time. Really appreciated!

 

[Bezzer88]

For anyone still having this problem it's an easy DIY fix. Check the image below and spray a very small amount of expanding foam from your local DIY store where the arrow indicates, this fills the shaded blue section and insulates the noise resonating up the shaft . Use the plastic nozzle provided with the foam applicator and insert a few mm into the shaft

There's a trim panel under the drivers side dash with 2x T20 torx screws and about 4 small connectors and the bonnet pull handle to be unplugged before the panel pulls down and away reavealing the top of the steering column .

Once applying a small blast of foam in there , wait with it and scrape any excess that protrudes upwards out the shaft. When it dries you can just scrape excess off with a screwdriver or similar anyway.

For anyone worried about the bottom end of the shaft exploding with foam, you are safe as the spline section is a tight fight and the foam is contained within the shaft . I double checked this under the vehicle.

Good luck and let me know if it helps.