PCV Valve
I am wondering what would a bad PCV valve do? My car had a Check Engine light on and when i changed the air filter it went off. I had it checked when it was on and my mechanic said it was some sort of emissions valve?? He said it could be fixed but he would have to take some parts off to get to it?? If it was busted would it cause a rattle at idle that you can only hear with the hood open (my cars symptoms) or something else?? I hear if its the PCV than thats not good so if its broke i want it fixed!!!!