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I have a 2000 1.8T with a little over 200,000 miles on it. Lately (the past few weeks) it's been making a really loud whining/squealing noise when I accelerate. It doesn't make the noise when the engine is cold, but it is very loud when the engine is warm or I'm going up a hill. Has anyone heard this noise before and fixed the problem? It seems to interfere with the amount of power the car has when going up hill or accelerating, and I am planning a 2,500 mile trip next week, so this is somewhat urgent for me to fix. Thanks in advance for y'alls help! :)

Here is a link to a video I made while driving the other day:

https://youtu.be/aEN_AircAXs
 

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Classic issue; check boost related issues. In this case; the diverter valve can have a hole in it or some of the boost hoses or others, like the vacuum hose to the brake booster, can have a hole in it.

You can test the diverter valve with a vacuum gauge; check out these videos on the top of the page:

https://www.google.com/search?q=div...rome..69i57.7046j0j7&sourceid=chrome&ie=UTF-8

if you need a new one; stick with oem, like Kayser.

VW part #: 06A145710N

https://www.google.com/search?ei=QD.......0...1.2.64.psy-ab..0.0.0....0.deLd7WGRn-w
 

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Discussion Starter #3
@billymade:

Thanks for the recommendation to check the diverter valve! Turns out it wasn't holding vacuum, so I replaced it this afternoon with the part you recommended. It made a huge difference in the amount of power I have while driving... however, the squealing noise is still there. So I guess that wasn't the problem... ugh. A little more on the sound, I've been looking for other videos on YouTube to see if I can find someone with a similar problem and I haven't found anything that sounds anything like my problem. I tried rolling down the windows while driving to see if I can hear it outside the cab, but it seems like you can only hear it from the inside (it sounds like it's coming from the gas pedal itself.)

If I can't figure it out on my own, I guess I'll have to take it to the dealer!

Thanks for your help.

- Duskylite
 

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Follow the brake pedal to the fire wall the booster is on the other side. The actuator rod connects the brake pedal in to the back of the brake booster. It is 10 or 12 inches around. I never heard that before but I could imagine a rupture in the brake booster diaphragm might sound like that. And the vacuum leak would have an effect on your performance.
 
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