Jun 15, 2015, 04:28 PM
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Engine knocking sound at start up
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 22
Likes: 1
From: Atlanta, USA
2009 E350 Luxury P1
Engine knocking sound at start up
After having the car sitting for a few hours or when first cranking in the morning the engine gives a knocking sound, almost sounding like drums, and it disappears after a couple seconds.
I currently have 5-30 synthetic oil in it, tomorrow putting 0W-40 with a Mann OEM filter. Will that solve my issue?
Should I be concerned about this or should I take in to a dealer? I hate to take it to the dealer since I barely trust any of them, and they usually always fix one thing and brake another...
I heard this on several M272 engines, then again, some don't do it. So I am wondering if the oil should take care of it.
Thanks,
I currently have 5-30 synthetic oil in it, tomorrow putting 0W-40 with a Mann OEM filter. Will that solve my issue?
Should I be concerned about this or should I take in to a dealer? I hate to take it to the dealer since I barely trust any of them, and they usually always fix one thing and brake another...
I heard this on several M272 engines, then again, some don't do it. So I am wondering if the oil should take care of it.
Thanks,
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 22
Likes: 1
From: Atlanta, USA
2009 E350 Luxury P1
Timing chain loose? What about after those 3 seconds? It tightens itself? It's a knock that appears to go away as soon as the oil pressure gets up.
Well I will just leave it like this, as some say its normal and some don't. I don't want the dealer to come up with decisions to take engine apart, as I know they only want to take advantage of warranty and just replace something to make money.
Well I will just leave it like this, as some say its normal and some don't. I don't want the dealer to come up with decisions to take engine apart, as I know they only want to take advantage of warranty and just replace something to make money.
Member
Joined: Sep 2011
Posts: 216
Likes: 2
From: Bristol, CT
06 S211 E500 4Matic
Loose timing chain or tensioner will sound more like a chainsaw and will be constant. As far as I know, timing chains/tensioners have not been problematic on the Mercedes engines.
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 22
Likes: 1
From: Atlanta, USA
2009 E350 Luxury P1
When sitting in the back seat I kind of feel the vibration.
What could this be?
Junior Member
Joined: May 2013
Posts: 28
Likes: 1
W 211 E 320 cdi amg
Yes,it is sound from chain area.Go to the dealer or some other workshop for diagnose and my teory will be confirmed.It is not normal sound and with time it will be louder and it will last longer...
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 22
Likes: 1
From: Atlanta, USA
2009 E350 Luxury P1
Knock at engine start after sitting overnight has been identified: Main bearings, too much clearance... Need to replace them under warranty.
I wonder what else may pop up in the life of the vehicle, right now just 42k miles on the clock..
I wonder what else may pop up in the life of the vehicle, right now just 42k miles on the clock..
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Member
Joined: Sep 2011
Posts: 216
Likes: 2
From: Bristol, CT
06 S211 E500 4Matic
I can't hear anything out of the ordinary in the clip you posted. Can you hear it outside? It's hard to hear anything from the inside due to the plethora of sound insulation. With 42k miles on the car, I highly doubt that it's timing chain or tensioners. That problem is more common at 100k-150k miles.
This is what a loose chain/tensioner sounds like:
This is what a loose chain/tensioner sounds like:
Last edited by 06E5004ME; Aug 1, 2013 at 03:56 PM.
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Member
Joined: Sep 2011
Posts: 216
Likes: 2
From: Bristol, CT
06 S211 E500 4Matic
Could you be a bit more specific? Which bearings? I'd like to know just so I can keep an eye out.
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 22
Likes: 1
From: Atlanta, USA
2009 E350 Luxury P1
But here is a video from youtube with the same engine noise at start up that I have:
Junior Member
Joined: May 2013
Posts: 28
Likes: 1
W 211 E 320 cdi amg
How did they come to conclusion that bearings are bad? Did they dismantled the engine? Did they at least take off oil pan? There is no other way to diagnose bearings without one of actions what i mentioned.Sound from bad main bearings will go louder when engine reaches operating temperature and it is noticed any time you hit throtlle,it can't be heard only on engine startup.In yours case there is some other things hangin around,not just main bearings...
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 22
Likes: 1
From: Atlanta, USA
2009 E350 Luxury P1
How did they come to conclusion that bearings are bad? Did they dismantled the engine? Did they at least take off oil pan? There is no other way to diagnose bearings without one of actions what i mentioned.Sound from bad main bearings will go louder when engine reaches operating temperature and it is noticed any time you hit throtlle,it can't be heard only on engine startup.In yours case there is some other things hangin around,not just main bearings...
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 22
Likes: 1
From: Atlanta, USA
2009 E350 Luxury P1
Thanks man, but do you think the car is gonna last after that engine rebuild, as some say it will have problems down the road since engine has been taken out and worked on?
Thread Starter
Junior Member
Joined: Jul 2013
Posts: 22
Likes: 1
From: Atlanta, USA
2009 E350 Luxury P1
Just a call from MB dealer, knocking is normal and won't affect performance or longevity of the engine. The ticking that I showed in one of my videos is coming from a purge valve, they will replace it under warranty.
The knock will be documented as "normal" for future protection when I'm out of warranty.
Anyways, I have to trust them and I will live with it.
No faulty bearings whatsoever.
Thanks
The knock will be documented as "normal" for future protection when I'm out of warranty.
Anyways, I have to trust them and I will live with it.
No faulty bearings whatsoever.
Thanks
Newbie
Joined: Aug 2013
Posts: 2
Likes: 0
2010 c63 AMG
Had a similar problem on my C63. The dealer did the following and its fixed. Replace intake and Exhaust CAM Adjusters. Under warranty, otherwise cost $ 3 grand. Kept the car fora week.
dearer did a great job.
dearer did a great job.
Junior Member
Joined: May 2008
Posts: 21
Likes: 2
'16 C300
There is an open campaign to replace the boot on the adjusters. Warranty should replace the bad adjuster.
Super Member
Joined: Jun 2013
Posts: 804
Likes: 74
From: Staten Island, NY
2010 MB S550, 2017 MB SLC 300
Sounds like piston slap to me. Used to get a similar noise on one of my N* motors. From what I understand piston slap develops when there is too much carbon in the engine. The solution is to do a WOT as often as possible.
Newbie
Joined: Jun 2012
Posts: 8
Likes: 0
2010 GLK350 4matic
Cold engine Start up noise
I also own a 2004 C230K. I used 0W-40 and Mann filter. When it gets cold outside and the car sits for a while, I get a rough engine noise and very weird and loud but quick rattle in about 2 sec after start. I did a lot of research. read many threads. took the car to many places including the dealer. No one can legitimately or accurately diagnose this issue. My latest finding is that it is oil related but more so the 0W-40 oil. While it is a great oil, it is too thin for this engine. Most if not all the oil settles at the bottom of the pan and especially when its cold outside. 0W-40 is designed so that it is thin when cold and thick when it warms up. so the colder it is the more likely you will hear the noise versus hot days or warm engines/Oil.
That being said, I have yet to find a better oil or an additive for this engine [M271] that is Mercedes approved and fixes this issues without causing other problems. in my opinion, a thicker oil or an additive or even an external oil pump along with the engine oil pump that can start prior to starting the engine could be a good fix especially if implemented before any wear has taken place.
No healthy engine should sound like this.
That being said, I have yet to find a better oil or an additive for this engine [M271] that is Mercedes approved and fixes this issues without causing other problems. in my opinion, a thicker oil or an additive or even an external oil pump along with the engine oil pump that can start prior to starting the engine could be a good fix especially if implemented before any wear has taken place.
No healthy engine should sound like this.
Newbie
Joined: Jan 2018
Posts: 2
Likes: 0
E230, 2009
I will post more detailed info when I get the car back with the input from the dealership.
But here is a video from youtube with the same engine noise at start up that I have:
http://www.youtube.com/watch?v=D-95-cyv7B4
But here is a video from youtube with the same engine noise at start up that I have:
http://www.youtube.com/watch?v=D-95-cyv7B4
I just joined and need help. Could anyone diagnose and help with the above noise. The video above !
I have a 2009 E230 and makes exactly the same noise as in the video.
Sincerely,
3164MALIK
Newbie
Joined: Jan 2021
Posts: 2
Likes: 0
E class 220d w213 2016
E class 220d 2016
I’ve just bought My car from a private seller and it is having exactly same noise and it happens even when car isn’t start., if I just press start button once quickly abs have ignition on, the noise will come after few minutes for few seconds abs go away and will come back after 10 mins or so and keep doing it same.
can someone advise what to do as many people have advised different solutions for this problem.
can someone advise what to do as many people have advised different solutions for this problem.
Newbie
Joined: Apr 2021
Posts: 1
Likes: 0
From: Singapore
2010 W212 E300
Was anyone ever able to find a definitive cause to this noise (as in the second video above)? I recently bought a 2010 E300 (W212) and while the car is noise free on cold starts or even if shut down for a short duration, i have the exact same “clunking” that occurs for about 3-4 seconds only when the engine has been left idle for about 1-2 hours after being run (water temp indicating between 40-60 degrees C instead of the usual 85deg C).
Thank you for any info....
Thank you for any info....
Senior Member
Joined: Feb 2021
Posts: 278
Likes: 146
From: Canberra ACT
2013 E350 Facelift (Japan Import) 2007 E350 Elegance Wagon, 2014 E350 Wagon facelift model Jap Model
My E350 does this dull knock knock knock sound on cold starts, after sitting over night, not every time but occasionally. My mechanic friend said it's most likely piston slap on start up, he said my engine has 170,000km on it and it's not unusual for its mileage.
Yours is much newer so I would be very concerned it's getting this noise on start up.
Yours is much newer so I would be very concerned it's getting this noise on start up.
