Hey guys, i've been getting this random buzzing/vibrating sound from the engine lately after I got a tune. Car only has 3800 miles and service A was just done at 3700 miles. I got a EC tune basically right after service A was complete. I can't recall whether it was always on a cold start or warm start, but this video was taken during a warm start. Not sure if the tune even has anything to do with it but it did start happening after I tuned it. Doesn't happen every time though, I would say its happened 10% of the time I start the engine since the tune and it seems to go away once I drive the car a bit. Rest of the car is completely stock. Any idea what it is or is it normal?

Here's the video. I was in a rush to leave so I didn't pop the hood.

Can't see how this would be tune related but not sure what it is.
BTW great detail on your car, a real mirror finish!!

ive had that noise come up on cold days before. don't really think it's anything to be concerned about, but what do i know.

I have this exact sound... I am not 100% sure but I think its either the water pump or oil pump. but I think its normal and it goes away when the oil or water pump heats up. I think its like the sound of bearings or the likes.

sounds like power steering pump. check your fluid level

This has happened only when I let the car idle after a start. I think I generally miss it because it doesn't happen when engine is cold or operating temp. Only when in between, like when idling from cold for about 5-10 min.

Happend to mine after changed the plugs to the weistec ones. Gone away after about 6mths

I got that sound too. It's normal.

Is that the sound of the "fan" thing that heats up that catalytic converters?
That comes on for me on cold starts (mornings), and there is some fan thing that aids in heating the cats faster.
Had it on my ML63 too.