M272 warm startup knocking
Thread Starter
Newbie
Joined: Sep 2024
Posts: 3
Likes: 0
M272 warm startup knocking
Hi
I have w204 with m272 engine and 119k mi
Recently I am having knocking only when warm startup and its start after 2 seconds of the engine start and keeps going for 2 seconds only
But the funny part is there's no sounds what so ever in cold startup !
Here's 2 videos on YouTube who have similar problems
Thanks
https://youtu.be/D-95-cyv7B4
https://youtu.be/n0uwx2Nn2W4
I have w204 with m272 engine and 119k mi
Recently I am having knocking only when warm startup and its start after 2 seconds of the engine start and keeps going for 2 seconds only
But the funny part is there's no sounds what so ever in cold startup !
Here's 2 videos on YouTube who have similar problems
Thanks
https://youtu.be/D-95-cyv7B4
https://youtu.be/n0uwx2Nn2W4
Super Member
Joined: Apr 2008
Posts: 765
Likes: 171
From: Walnut Creek, CA
325Ci, 325Cic, C300
I’ve had the same noise in the same conditions since new. 2008 C300. 250k mi and16 years later, it’s still there. Call it character and don’t you dare crack open an otherwise healthy 272. There’s nothing to gain.
Thread Starter
Newbie
Joined: Sep 2024
Posts: 3
Likes: 0
What about diagnosis from mechanics or anything? Aren't you curious to know whats the problem?
For me i added lucas synthetic stabilizer and changed oil filter but no luck ...
Junior Member
Joined: Jun 2007
Posts: 27
Likes: 2
Hi
I have w204 with m272 engine and 119k mi
Recently I am having knocking only when warm startup and its start after 2 seconds of the engine start and keeps going for 2 seconds only
But the funny part is there's no sounds what so ever in cold startup !
Here's 2 videos on YouTube who have similar problems
Thanks
https://youtu.be/D-95-cyv7B4
https://youtu.be/n0uwx2Nn2W4
I have w204 with m272 engine and 119k mi
Recently I am having knocking only when warm startup and its start after 2 seconds of the engine start and keeps going for 2 seconds only
But the funny part is there's no sounds what so ever in cold startup !
Here's 2 videos on YouTube who have similar problems
Thanks
https://youtu.be/D-95-cyv7B4
https://youtu.be/n0uwx2Nn2W4
Super Member
Joined: May 2024
Posts: 506
Likes: 124
From: Northern Indiana
2014 c300 w204.080 3.5 v6
Cars can make crazy noises as they go over 100K so if it causing no problems its prolly not worth looking at. Also since it only does it at certain times it will prolly be difficult to find and fix.
