So for the past 4 months or so my 2011 GTI has been making a rattling noise in the engine bay on startup and deceleration. On start up the sound will go away after 25 seconds. There haven't been any check engine lights, but a few misfires lights on occasion. It has been to the mechanic multiple times and we changed the fuel injectors, timing chain tensioner, and the main motor mount, and the sound is still there and won't go away! If anyone has any ideas or suggestions, they would be greatly appreciated!
Heres a clip of the sound:
https://youtu.be/mxcE4Pn28_0
Heres a clip of the sound:
https://youtu.be/mxcE4Pn28_0