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Roman, Technician
Category: Audi
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Experience:  over 20 years vw audi and porsche technical repair
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Roman- I just notice the squealing sound actually continues

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Roman- I just notice the squealing sound actually continues even after the engine has stopped, like pressure is escaping, thoughts? You helped me earlier with a belt tensioner question...

Roman : Hello ,Here to answer automotive questions and make you feel comfortable and become familiar with your product. With the engine stopped? Do you mean when you shut off the engine you ca
You can hear a whistle winding Down? Is the check engine light on? Have someone shut off the engine as you listen. Put you ear near the oil cap and dip stick and also around the top of the valve cover. There is a black breather valve on top of the engine that sometimes does this. Take a listen and let me know.
Customer: replied 3 years ago.

hello, yes the engine light is on, the whining noise seems to be coming from the back of the engine. I listened to top of valve cover and turned engine off and whining stops slowly . This sound only happens when iding in or out of gear...

You may have a large vacuum leak.


This is why the engine light is on. A vacuum leak will cause the emissions to go up ultimately wasting fuel and causing a rough running engine.


You have a 2.0 turbo?


On top of the valve cover, under the plastic engine cover, there is a valve for the emissions system which internally leaks, in some cases it fails and causes the sound you are hearing.


Also make sure the oil filler cap is closed tight and the oil dipstick is secured in it's place.








Also called the "breather valve" or "oil separator"

For vehicles with FSI engine only, must be used with ES2214976

If you’re getting puzzled by drivability problems take a close look at this pressure regulator valve or PCV. When these fail, the engine will lose boost pressure and also have trouble idling. It can also affect performance by not letting your engine receive all the boost air it is making. The part itself acts as a valve, providing a one way exit for gasses built up in the crank case, while retaining oil in the engine. When ruptured, it basically acts as a vacuum leak only less noticeable. If your car is showing some of these symptoms take a close look at this valve.

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Hi Brett

I'm just following up with you to see how everything is going. Did my answer help? Let me know when you have any additional questions

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