Engine vibrates occasionally
Thread Starter
Junior Member
Joined: Jan 2021
Posts: 26
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e350 2014 CLS450 2021
Engine vibrates occasionally
I just purchased a new 2021 CLS450. It now has 250 miles. This is my first turbo engine car after a very long time (my last one was Mazda RX-7). long story short the engine caught on fire and I never purchased any turbo cars anymore. I have a 2018 Lexus LX570 and the V8 engine is buttery smooth. The Mercedes starts good but after 2~3 minutes in idling shakes for no reason. It does this a few times. Also on the road at the traffic light sometimes same happens. Has anyone experienced this?
Newbie
Joined: Sep 2014
Posts: 14
Likes: 3
From: Toronto
2019 CLS 53
Could this be the ECO start/stop function? It will automatically switch off the engine if vehicle is stopped and certain conditions are met, and then automatically restart the engine as needed. This is rougher and more noticeable in some vehicles than others. It helps MB keep their fleet wide fuel consumption stats down.
There should be a button on the middle console to disengage. By default ECO start/stop is engaged on startup and the button shows a green light, pressing the button turns off ECO start/stop and the light goes out. The symbol on the button is "A" with an arrow around it in a circle. This feature is documented in the Owner's Manual.
There should be a button on the middle console to disengage. By default ECO start/stop is engaged on startup and the button shows a green light, pressing the button turns off ECO start/stop and the light goes out. The symbol on the button is "A" with an arrow around it in a circle. This feature is documented in the Owner's Manual.
Thread Starter
Junior Member
Joined: Jan 2021
Posts: 26
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e350 2014 CLS450 2021
This only happens in the beginning few minutes. On the road, all goes well including auto start-stop function. Then if I break the journey the car will do the same vibrations and then going smooth after 2~3 minutes. I can take it to the dealer but with my personal past experience with my 2014 e350 Mercedes, I do not want a dealer mechanic touching the car unnecessarily.
Junior Member
Joined: Sep 2002
Posts: 48
Likes: 11
From: San Diego
2022 CLS450 2011 Boxster Spyder 2022 Bayliss V2
I have the exact same issue on my 2022 which I bought October 2023 brand new. I posted a different thread - didn't see this one. I took it to the dealer and they ran diagnostics but did not find anything. I feel like the problem went away temporaily after long road trips - but came back with around the town traffic. I noticed it again yesterday.
Last edited by kdub; May 16, 2024 at 04:07 PM.
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MBWorld Fanatic!
Joined: Jan 2024
Posts: 2,525
Likes: 903
From: DFW
SL63
My first suspicion is loose hardware, fitting or connection.
Sometimes when hardware is loose, it can’t back out all the way from installation interference.
Anything loose will have a harmonic with engine vibration.
It could set up this harmonic vibration at certain engine speeds, in this case idle.
It might go away as the engine heats up, and seats better in its recess.
The best way to ferret out a vibration like that is to use a stethoscope and replicate as best you can the conditions where you routinely observe it.
Sometimes when hardware is loose, it can’t back out all the way from installation interference.
Anything loose will have a harmonic with engine vibration.
It could set up this harmonic vibration at certain engine speeds, in this case idle.
It might go away as the engine heats up, and seats better in its recess.
The best way to ferret out a vibration like that is to use a stethoscope and replicate as best you can the conditions where you routinely observe it.
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Newbie
Joined: Jun 2014
Posts: 9
Likes: 0
From: Oklahoma
2023 E450 4matic 2021 GLE350
Engine Vibrates occasionally
I just purchased a new 2021 CLS450. It now has 250 miles. This is my first turbo engine car after a very long time (my last one was Mazda RX-7). long story short the engine caught on fire and I never purchased any turbo cars anymore. I have a 2018 Lexus LX570 and the V8 engine is buttery smooth. The Mercedes starts good but after 2~3 minutes in idling shakes for no reason. It does this a few times. Also on the road at the traffic light sometimes same happens. Has anyone experienced this?
Regards.
Junior Member
Joined: Sep 2002
Posts: 48
Likes: 11
From: San Diego
2022 CLS450 2011 Boxster Spyder 2022 Bayliss V2
I have a 2023 CLS450 and had a similar issue and took to my dealer in Oklahoma City. The shop foreman check my car and suspected it was the firing timing. He reset the timing and the problem went away. I only noticed shaking in the steering wheel when the RPM at an idle would go from 500 to 800 rpm. I can provide you with the name of the shop foreman if you need. Send me an email.
Regards.
Regards.
Junior Member
Joined: Sep 2002
Posts: 48
Likes: 11
From: San Diego
2022 CLS450 2011 Boxster Spyder 2022 Bayliss V2
I just had my service done - around 7,500 miles on the clock. Believe it or not the dealer was able to observe the issue! I told them about the timing reset. They said instead there was a software update and it resolved the issue. I just got the car back - so TBD if it’s resolved.
Newbie
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