Hey guys, recently I've been noticing this whirring noise that seems to come from my engine and I'm not exactly sure what it is and how worried i should be about it. When i turn the car on it has this whirring noise while idling (it's not really loud but enough to annoy me if I don't have music on). As for how it sounds, sounds kinda like the noise when going in reverse. While driving it'll get louder and softer with the rpm. Any advice?