Hey guys so I have a 08 TL Type-S AT, and lately during my cold start up in the morning its been making a weird flapping noise when I put the car in reverse. Sometimes when I start it up it makes the noise at idle but its very faint. It does not make the sound at all during the day while its hot. I'm not sure what the problem is and I couldn't find anything searching on the forums. Anyone have a idea? Thanks in advance.

Here is a youtube video of the closest thing I could find of the noise. It sounds like a spinning wheel start on 23seconds.

 

Make a video of the actual sound too

 

I can make 1 in the morning.

 

Does it do it at idle in park at all?

 

Sometimes It makes that sound at idle but its not as bad as when i put it in reverse and when it goes in drive it goes away.