A high pitch "squeak" coming from the pulley starting. (see video, the pulley on the right side)
They noise can be heard from the cabin, especially if no music is playing.
https://drive.google.com/file/d/0B-C...ew?usp=sharing
https://drive.google.com/file/d/0B-C...ew?usp=sharing
I timed it, and it seems as it happens approximately every 30 seconds. (the 48sec one was missed)
https://drive.google.com/file/d/0B-C...ew?usp=sharing
Have any of you experienced this in your 86?