Hi guys!

Attached is a video of an engine rattling when coming down to idle/revving. Car has no CEL and drives perfectly fine and makes great power.

Any idea on what this rattle could be? TCT, tensioner and idler pulley bearings brand new. The rattle goes away when revving/driving.

The car also has this hum/buzz at around 3500-4500rpm regardless of throttle position or cruising. Feels like it’s coming from the transmission tunnel. Doesn’t have a heat shield and have checked all the bolts/header and notorious bolt/flange. Have also checked if there was an oil cap wedged between gearbox. Has an invidia decat too so not loose insides either.

The main concern is the rattle on idle/when revving/letting revs drop to idle but appreciate help for everything else. I hope the specialist Billman can help too

 

Video of buzz at 4000rpm when accelerating regardless of throttle. I have pinpointed the buzz within the video (not the deceleration clutch buzz)