Mazda 6 occasionally heard a loud noise from the nose during the hot car and driving, sometimes it disappeared after a minute, and occasionally it rang again.

Is it a slight noise? I asked the master of 4S and said it was the noise of throttle valve, which was normal.

Mine can only be heard when the cold car starts, and the sound is relatively small, so I can barely hear it in the car.

After opening the cover, you can hear the sound coming from near the throttle, that is, between the air cleaner and the engine.

If you think it's different from your situation, you'd better find a mechanic to make sure it's the reason.