i was told that the pcv has gone bad on my sir2 motor cause the mechanic showed me that "what looked like the pcv" was making a noise periodically and when you put your finger on it, when it's making the noise, you can put your finger on the plastic peice and feel some pulsating. Now i tried to follow the instructions out of a haynes for a usdm si motor but it looks like the plastic piece is not ment to come out. What is making that noise and feel from that plastic piece?!!! please, anyone?!!!