2015 e63 knock sound at idle - sounds expensive
Thread Starter
Junior Member
Joined: Nov 2018
Posts: 70
Likes: 11
2015 E63 AMG-S
2015 e63 knock sound at idle - sounds expensive
hello everyone
started my car this morning and hearing a loud rattle/ knock from engine bay. it only happens at idle. when I increase RPM the sound goes away.
no warning indicators at all.
the sounds not the best in this video clip but hoping some well trained troubleshooters on here have any ideas what it could be?
started my car this morning and hearing a loud rattle/ knock from engine bay. it only happens at idle. when I increase RPM the sound goes away.
no warning indicators at all.
the sounds not the best in this video clip but hoping some well trained troubleshooters on here have any ideas what it could be?
Out Of Control!!
Joined: Apr 2019
Posts: 12,253
Likes: 6,912
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
What's your current mileage ??
sounds related to... exhaust pipes ??
Hope it's not a turbo wobling
Inspect running serpentine visually
Next: capture closer sound from the engine bay.
sounds related to... exhaust pipes ??
Hope it's not a turbo wobling
Inspect running serpentine visually
Next: capture closer sound from the engine bay.
Last edited by CaliBenzDriver; Jun 20, 2026 at 09:38 PM.
Thread Starter
Junior Member
Joined: Nov 2018
Posts: 70
Likes: 11
2015 E63 AMG-S
no after market exhaust.
I've attached a new video from engine bay...seems louder towards back of engine?
really puzzling that noise abates when I give some gas
Out Of Control!!
Joined: Apr 2019
Posts: 12,253
Likes: 6,912
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
closer by sound
Engine sounds smooth and unaffected.
Based on the aboves, I'd check freeplay of :
- turbo waste gates
- serpentine idlers pulleys
Last edited by CaliBenzDriver; Jun 21, 2026 at 09:13 PM.
Thread Starter
Junior Member
Joined: Nov 2018
Posts: 70
Likes: 11
2015 E63 AMG-S
again I really appreciate your time and help!
Out Of Control!!
Joined: Apr 2019
Posts: 12,253
Likes: 6,912
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
up inside closer
you need to remove engine covers to gain physical access.
Last edited by CaliBenzDriver; Yesterday at 12:00 AM.
