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Old 16th November 2020, 07:54 PM
vajper vajper is offline
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Join Date: Aug 2020
Location: Sweden, Skåne
Posts: 33
Default 4.2 TDI engine noise

So, recent week my car has grown some kind of RPM-related engine noise. 2005 A8 D3 4.2 TDI (BVN)

It's not related to transmission or speed, present when in N/P just revving the engine. Cool/warm motor doesn't matter. Same goes for any load, present all the time but most apparent around 1000-1800 RPM, above that the engine itself drowns the noise.

Haven't been able to really locate the source but a qualified guess is anything going on the belt such as water pumps, AC compressor, etc.

Tried to turn off the ACC with the On/off button on the dash but not sure if there is any AC compressor clutch on this car. Turning off the ACC doesn't change the sound. Should turning off the ACC disengage the compressor?

Anyway, what is the best way to troubleshoot this? Hanging off the belt and see if goes silent?

Here's a video where the noise is present. You can hear a high-but-not-very-high pitched noise, a little bit like a sewing machine or something that follows the engine RPM.

https://youtu.be/sEZqyww4H8Y

Any ideas would be appreciated
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