Quote Originally Posted by Mattglas View Post
I did the test and this is what I found. When the key was turned the valve instantly turned all the way to the right (right being towards the center of the engine). Then, it held that position for about 10 seconds and slowly/smoothly went back to the original position.

I also noticed that the inside of the valve was coated with black soot.

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the black soot it normal but you can clean it. Was movement fairly smooth. Movement you observed would be Normal, so long as it didn't stutter during the sweep.