Hi all, I have a 2014 s9 5sp auto 2.5td which has a whistle (dentist drill like), but only in second gear. It kicks in as soon as it changes into second gear and dies out once it goes into third. It increases with acceleration but the noise is there even if I'm crawling down hill with foot off the accelerator. It's only in that gear.
Mechanic said that there was a crack in EGR pipe assembly and so replaced that, but the whistle is still there. Mechanic now says that he thinks the turbo needs to be replaced but can't really explain why it's only in second gear and completely non existent in other gears other than to say that second gear must hit a sweet spot.
Here's a recording https://drive.google.com/open?id=11wRUfDPEGvUvsmqGG1xELjOx9D9zDTnm
As you can hear, it happens in second gear, all of second gear and nothing but second gear.
Any ideas?
Mechanic said that there was a crack in EGR pipe assembly and so replaced that, but the whistle is still there. Mechanic now says that he thinks the turbo needs to be replaced but can't really explain why it's only in second gear and completely non existent in other gears other than to say that second gear must hit a sweet spot.
Here's a recording https://drive.google.com/open?id=11wRUfDPEGvUvsmqGG1xELjOx9D9zDTnm
As you can hear, it happens in second gear, all of second gear and nothing but second gear.
Any ideas?