Changed my pcv valve the other week as I noticed wasn't working properly took it off and the valve inside wasn't working so ordered a new one it's in about a week and I noticed a humming noise last night thought it was my fan but It got worse so started looking around the engine and could just hear this whistling noise sounded like it was coming from the air filter box took the breather pipe off and the noise stopped when I covered the end of the pipe and then let go it made a long chirping noise anyone ever seen that before? Tried to post a video of it but it won't upload
