Jun 15, 2015, 04:28 PM
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Engine knocking sound at start up
Junior Member
Joined: May 2021
Posts: 17
Likes: 1
From: Morwell Victoria Australia
Mercedes w204 2007
Same problem
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
Junior Member
Joined: May 2021
Posts: 17
Likes: 1
From: Morwell Victoria Australia
Mercedes w204 2007
Question
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,
Junior Member
Joined: May 2021
Posts: 17
Likes: 1
From: Morwell Victoria Australia
Mercedes w204 2007
Anyone know what the knocking is
No one can tell me what the knocking sound is. My car has it occasionally. Has anyone repaired the issue? Funny thing is it rarely does it on cold starts usually does it when warm or hot after stopping the car for a hour then re starting. It's pissing me off, I'd really like to know what causes it. My engine doesn't suffer from the bad batch of timing chains, balance shaft or guides but still occasionally makes this bottom end knocking for 2 to 3 seconds then goes away as soon as oil pressure comes on. It has to be a oiling issue. I'm almost tempted to stop using expensive oil and putting Castrol magnatec in to see if it stops this knocking sound
Member
Joined: May 2012
Posts: 101
Likes: 19
From: Orange County, CA
08 E350
Many M272 engines exhibit this behavior. My car does it too and it's currently at 195k miles. On an oil forum this problem was discussed and they tried to come up with a solution, as in to what oil to use to not have this issue. Nothing really helped. I have noticed it less with Liqui Moly 5W-40 than the Mobil 1 0w-40 (which I wouldn't put in my car anymore as it burns a quart every 5k or so). It also occurs less than Mobil with the Castrol 0W-40 that is currently in the car. Bottom line was it may be rod bearings and we can't do much other than change those or live with it as it's only for a couple of seconds and not every time.
Junior Member
Joined: May 2021
Posts: 17
Likes: 1
From: Morwell Victoria Australia
Mercedes w204 2007
Found the knocking noise
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.
MBWorld Fanatic!
Joined: Jul 2012
Posts: 4,511
Likes: 1,513
From: Orbiting the planet
This place is a joke.
There is a bulletin from MB regarding this sound. The remedy is to replace only the upper half of the crankshaft bearings with a tighter spec clearance bearing. Somewhat of a big job, especially in a 4matic vehicle. With 182k miles on mine, it's not worth the work or expense.
Newbie
Joined: Oct 2021
Posts: 13
Likes: 3
2009 E550
Someone on another forum managed to get Mercedes-Benz to confess that this specific 2 to 3 second knocking sound is actually a titled piston. Apparently almost all m272 engines make this noise randomly at times upon start up. Nothing can be done about it and apparently Mercedes-Benz say it does not cause the engine any harm, and at 215,000km I'd say they are correct. So many new m272 engines under 80,000km and 50,000km reported making this knock so I'd say they may be telling the truth.
Junior Member
Joined: May 2021
Posts: 17
Likes: 1
From: Morwell Victoria Australia
Mercedes w204 2007
Knocking sound
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Junior Member
Joined: May 2021
Posts: 17
Likes: 1
From: Morwell Victoria Australia
Mercedes w204 2007
your rattle is most likely the camshaft adjusters, they were a common fault as well
Member
Joined: Dec 2021
Posts: 192
Likes: 50
E350 4matic Wagon
More like a rattle
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,
I am at 247,600 and this is where I am at. I have at least two valves that are leaking - you can tell this from pulling and inspecting the spark plugs. Mine is a 2007. Unfortunately it is time for me to invest in another vehicle.
Junior Member
Joined: May 2021
Posts: 17
Likes: 1
From: Morwell Victoria Australia
Mercedes w204 2007
First, how many miles do you have on the car? Second, if you are having a rattle that occurs at start up only (as the engine settles to under 1,090 rpm and it goes away within seconds, then you are likely a) low on oil; b) burning oil; c) have some chain wear happening; and d) like me, in for some larger repairs on your car.
I am at 247,600 and this is where I am at. I have at least two valves that are leaking - you can tell this from pulling and inspecting the spark plugs. Mine is a 2007. Unfortunately it is time for me to invest in another vehicle.
I am at 247,600 and this is where I am at. I have at least two valves that are leaking - you can tell this from pulling and inspecting the spark plugs. Mine is a 2007. Unfortunately it is time for me to invest in another vehicle.
Newbie
Joined: Oct 2021
Posts: 13
Likes: 3
2009 E550
Junior Member
Joined: May 2021
Posts: 17
Likes: 1
From: Morwell Victoria Australia
Mercedes w204 2007
Just drove it pretty hard today and I couldn't hear the rattle at all. It only seems to do this occasionally. If you don't mind me asking, how can I confirm the cam adjusters are the source of the sound, and by cam adjusters do you mean the actual adjusters (very expensive if I need to do all four) or just the magnets?
Junior Member
Joined: Jul 2022
Posts: 28
Likes: 7
w202, w212
Hi guys, my mercedes e350 w212 with engine m272 sometimes has the same rattling sound at startup. I hear that noise only for 2-3 seconds and it is more louder after the car has been parked for 3-4 hours. At cold start the sound is almost not noticeable.
It is the same sound as in the clips
Does somebody find a solution?
It is the same sound as in the clips
Does somebody find a solution?
Newbie
Joined: Sep 2022
Posts: 12
Likes: 1
W211
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
Newbie
Joined: Dec 2013
Posts: 13
Likes: 1
2013 C300 4matic
I have the same issue with the noise on startup, I replaced with updated tensioner and check valve for the right side. The issue still the same, no improvement..... I turn the engine and found one of the Sprocket solenoid on the intake side is spiting out oil. At this point I don't know what I need to replace. I don't even know how to determine if the chain is no good or not. Or even the sprocket, Anyone can help me? or share some experience?
The whole thing started with engine misfire cylinder 1 (P0301) and now engine shakes at low speed and when you press the gas. I heard this rattle noise is pretty common issue with m276.
The whole thing started with engine misfire cylinder 1 (P0301) and now engine shakes at low speed and when you press the gas. I heard this rattle noise is pretty common issue with m276.
