GTD CFGB Whistles After Startup

Hello,

I've recently been having a problem with my GTD.
Every time I start the car and then accelerate, especially when I press the gas pedal in first and second gear, I hear a very high-pitched whistling sound coming from the engine compartment (possibly the turbo?). After the second time I press the gas pedal, the whistling stops, and it only returns when I turn off the engine and the car has been sitting for a few minutes (like 5 minutes).
The sound is similar to the high-frequency whistling from the power steering pump in my ARL Golf, but slightly higher in frequency. The whistling is only audible under load, not when the car is stationary.

Does anyone have any idea what this could be? I'm still under warranty, so I might be able to get parts replaced!

Hello.

Sounds are always quite subjective. Do you have the possibility of recording the sound?
Then you can upload it here.

When I read your text, it reminds me a little of my old car. You can drive comfortably for miles, and everything is great.
Then the highway, without a speed limit, goes uphill, and you press the accelerator and keep your foot on it. After a short time: Whoosh!
Suddenly, you get a jolt and instinctively ease off the throttle, as the noise resembles a seized charging pump shaft or worn compressor impellers.

-> Check the turbocharger, specifically for shaft play and damage.
-> Check the turbocharger air intake and exhaust sides for leaks.

Ultimately, it turned out that the exhaust temperature sensor, which is screwed into the exhaust manifold, was not properly tightened. Under high load (high exhaust temperature), it apparently expanded to the point where it was slightly more leaky, and the escaping exhaust gases caused the extreme "iii" noises. I tightened the nut and everything was okay.

So, check all components on the intake and exhaust sides for leaks.

Of course, it could also be something completely different in your case (e.g., a belt drive with a pulley or guide roller with a defective bearing, or a belt that is slipping).

Quote:

The whistling sound is only audible under load, not when the device is idle.

However, this supports one of the former causes and argues against the belt drive.

Best regards, Rainer.
PS:

Quote:

comparable to the high-frequency whistling sound from the PD elements

I haven't encountered that yet. The pipes are relatively safe, never, except possibly from the last hole.

Hi, thanks for the reply.

"PDs all exhibit this high-frequency chirping sound under load."
It's really intense at my workplace.
The sound is similar, so I'm not sure if it's coming from the turbo. In the ARL models, it was the PD elements that made such noises, but those are usually static and normal. I think you can hear it with every PD.

slg60 wrote:

Hello, I've recently been having a problem with my GTD. Every time I start the engine and then accelerate, especially when I press the gas pedal in first and second gear, I hear a very high-pitched whistling sound coming from the engine compartment (possibly the turbo?). After the second time I press the gas pedal, the whistling stops, and it only returns when I turn off the engine and the car has been sitting for a few minutes (about 5 minutes). The sound is similar to the high-frequency whistling from the PD (plasma discharge) elements in my ARL Golf, but slightly higher in frequency. The whistling is only audible under load, not when the system is idle. Does anyone have an idea what that could be? I still have a warranty, so I could have parts replaced!

Hi,

I haven't encountered such a problem with either the car with 170,000 km on the odometer that I had serviced at the ASZ (authorized service center), nor with the one with 70,000 km that I owned (although it was a CBBB model).

In addition to Rainer's tips, I would suggest checking whether you are affected by the workshop campaign regarding the balancing weights on the fuel injection lines. There is a potential risk of resonant fractures in approximately 299,000 units of the 2.0 TDI CR engine. This is just a suspicion, and I have no experience with how such resonances might sound in practice with these very short lines. However, checking this will only take you a few seconds.

http://www.volkswagen.de/de/servicezubehoer/VolkswagenService/rechte_marginalspalte/abfrage_rueckrufaktionen.html