Hello fellow Honda fans I am having a problem with my 97 civic ex, It seems there is a low humming sound coming from the air intake. The sound gets louder when I take off the cover like you would to replace the filter ( I have the stock air box ). Anyhow it does this when the car is idling around 800rpms. Does anyone have any idea what this could be? There are no other problems other than the noise but I am really scratching my head at what this is.