A video of the sound would help figure out what it is. The forum won’t take video uploads but you can link to icloud or google drive, youtube, etc.
The more detail you provide the more clues there will be. For example, although you only hear it at low speed, are you throttle-off coasting, steady cruising, or accelerating?
It lasts about one second – is that because you’re accelerating through a certain speed that seems to create the sound? Does the sound happen only once during the first start of the day while the car is cold, or does it happen intermittently throughout the drive one second at a time, every time you drive at low speed?
