This evening after I got back from Atco Raceway, I still had my buddy’s RS5 so I thought that it would be a good idea to tinker and look around a little bit. I got permission to take things apart and look before removing anything. Also PsYkHoTiK asked about carbon buildup on the RS5s so I was interested.
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Took the big middle engine cover off and there are two PCV valves. One behind each throttle body. Each valve cover has a line that goes off it to the corresponding PCV valve. That is different from the other FSI V8s. The B7 RS4s have a plastic line that comes of each valve cover and then merges into one line at the one PCV valve on the back of the intake manifold. The low revving FSI 4.2s like in the Q7, 2007+ C6 A6, 2007+ facelifted D3 A8s, and B8 S5 coupes have one plastic line that goes off the driver’s side/bank 2 valve cover to the PCV valve and then the passenger’s side/bank 1 valve cover is capped off.
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I took the cap off the left/driver’s side PCV valve and the rubber diaphragm and spring came off with it. This is a different style then the low revving S5 that I have been working on recently. Part of a flap of the diaphragm is going through the end of the spring. There was also traces of liquid oil inside the PCV internals.
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My buddy was curious of carbon buildup on this car. It has just over 26K miles and he hasn’t been driving it very much lately since he has been playing with his other Audi. So I got a chance to try out my Snap-On camera some more. I took off the driver’s side intake hose from the throttle body and then snaked this camera down into the intake manifold.
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After a few minutes of wiggling the camera end around and playing with it to get it directed at the valves, I saw this. It would seem that the RS5s have three piece plastic intake manifolds just like the later 2009+ V8 S5 coupes. There is the one big upper intake manifold and then two smaller side intake manifolds with the vacuum operated intake manifold flaps inside. So I applied vacuum to the vacuum nipple of the passenger’s side/right intake manifold and then the flap moved out of place.
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This was the best picture that I could get of the intake valve somewhere along the passenger’s side of the cylinder head. It has a decent amount of carbon buildup with just over 26K miles. There is a small chunk on the valve stem starting to appear. I don’t know which valve and port it is because I had no idea where the camera probe went once it was past the throttle body. The only way that I can tell that it is one of the passenger’s side intake valve and port is because I tried moving the intake manifold flaps on the driver’s side and the flap on my camera probe screen wouldn’t move.
http://i284.photobucket.com/albums/ll37/Jimmybones777/BK560008_zpsadfn4gyl.jpg
Definitely not the highest quality pictures from the camera probe but that is to be expected. Hope that this helps clear up a few things.