Mazda Axela 2007 2.0 Ratling Noise when Accelerating

When accelerating, There is a rattling Noise coming from the engine bay somewhere and i cant seem to pin point the exact location.

it most likely is the original Belt tensioner, second owner with 80,000kms on the clock

Got a couple of videos.

https://youtu.be/Zu2j2DijRh4

In the first video, should the tensioner be moving back and forward like that?

and in the second video, at about 0:31 you can hear the sound very clearly! It happens when in drive or reverse only.

https://www.youtube.com/watch?v=-Jwjy6rFxXI&feature=youtu.be

What do you guys think it could be?
 
When accelerating, There is a rattling Noise coming from the engine bay somewhere and i cant seem to pin point the exact location.

it most likely is the original Belt tensioner, second owner with 80,000kms on the clock

Got a couple of videos.

https://youtu.be/Zu2j2DijRh4

In the first video, should the tensioner be moving back and forward like that?

and in the second video, at about 0:31 you can hear the sound very clearly! It happens when in drive or reverse only.

https://www.youtube.com/watch?v=-Jwjy6rFxXI&feature=youtu.be

What do you guys think it could be?

Hello!

First of all I'd like to say that im not an expert but I'm having issues with my Mazda 3 2010 also a rattling noise under engine load. You noise sounds incredibly similar to a worn out belt and potentially worn out pulleys. Also worth checking that the oil has been changed recently along with the oil filter. In my case the engine was neglected by the previous owner and as a result it was full of crud and oil deposits, a combination of engine flush with fresh Castrol oil and MAN oil filter along with Wynn's Extreme diesel cleaner and hydraulic valve treatment made a huge difference and the noise in my case has been reduced to a bare minimum, but I'm still investigating it further. Good luck and keep updating on your progress.
 
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