Random buzzing sound from engine
Thread Starter
Newbie
Joined: Oct 2013
Posts: 6
Likes: 0
From: Socal
13 C63
Random buzzing sound from engine
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.
Here's the video. I was in a rush to leave so I didn't pop the hood.
Member
Joined: Feb 2012
Posts: 131
Likes: 1
C63 ML350
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.
MBWorld Fanatic!
Joined: Nov 2008
Posts: 1,624
Likes: 107
From: SoCal
2018 AMG GTR, 2017 GLS63, 2019 C63s
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.
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Jun 2012
Posts: 1,744
Likes: 8
From: Sydney, Australia
2010 C63 Estate
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.
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.
