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[Speitan]

Hi.

I've been asking this question from my local service and they don't know for sure what is wrong.

Here I have a video of my problem ->  http://www.youtube.com/watch?v=76TK8ygqKB4

In the service they thought that it might be the thing that is in this picture called "Magnetschalter Tankentluftung" in the upright corner.

http://img273.imageshack.us/img273/1516/motorgetriebeseite9gm.jpg

Has anyone else had the same kind of a problem? The problem persists only when car is on idle. Not while driving.

Thank you for your help in advance.

-Aki

[Kevin Wood]

That's the charcoal canister purge valve. I'd be surprised if it is causing that noise though. An easy way to tell would be to disconnect it from the back of the black breather cover on the top of the plenum (It's the larger of the two pipes in the centre of the four pipes that attach here) and see if the noise goes away. You may need to cover the outlet on the breather cover with your finger. If the noise still occurs it's not that.

The sound sounds more like an exhaust manifold gasket blowing or perhaps an inlet leak. Do you have an engine management light on or any stored fault codes?

Kevin

[Speitan]

That's the charcoal canister purge valve. I'd be surprised if it is causing that noise though. An easy way to tell would be to disconnect it from the back of the black breather cover on the top of the plenum (It's the larger of the two pipes in the centre of the four pipes that attach here) and see if the noise goes away. You may need to cover the outlet on the breather cover with your finger. If the noise still occurs it's not that.

The sound sounds more like an exhaust manifold gasket blowing or perhaps an inlet leak. Do you have an engine management light on or any stored fault codes?

Kevin

Ok, have to try removing the hose and check if the sound goes away.

There's no management light on and no fault codes. The car runs just fine. Only when engine is idling the sound comes. Sometimes it doesn't appear at all or it takes a long time to appear. In the end of the video you can hear the sound accelerating and stopping. When it stops, it takes a second and starts again. You can hear a little "tsup" in the end of the video. Sound is pretty loud. You can even hear it inside if you know what to listen

[Speitan]

Well, I found the reason to the sound. I used pliers and squeezed the pipe that Kevin mentioned and the sound stopped. When I released the pliers the sound started. Ok, clearly the sound was coming from the valve, Is this the charcoal canister purge valve? I have a picture of it here. Seems like it's missing a piece from the end. The other end has the pipe coming from the plenum and some electrical connector. What should there be in that other end that is broken??