E 400 4matic vibration
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e320
E 400 4matic vibration
Hi I have vibration issue with e400 4 matic while in gear stoped in D or R in (neutral it does not vibrate ). Changed motor mounts and transmission mounts twice, no check engines , no vacuum leaks, no misfiring, when it drives it’s perfect what cloud it be?
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Because this vibration happens vehicle stopped, we can mostly rule out 4Matic bearings to focus on engine itself -- Vehicle drives with stock vibration under load.
- What is vehicle current mileage ? (120k)
- What are the LTFT: 1;2 ? (lean)
- What were recently services items ? (plugs,...)
- How often is oil replaced ? (5/10k)
- What oil grade/type ? (w30/w40)
- How much oil is consumed between service ?
- what is engine response like after clearing faults ??
- Can you bore scope cyls. #4 ? (smooth, scored)
I believe vibrations are caused by uneven cyl. contributions. Possibly injectors, ignition, A/F mixture, leaky cyl.
Pls record a 30sec sound at a fixed 1000.Rpm in Park to hear how well engine is running.
Last edited by CaliBenzDriver; Apr 10, 2026 at 05:28 PM.
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
When was last tranny oil change ? Including the 4-matic DIFF oil.
I don't know the 4 matic part, but I do know well the RWD version of this car, mine.
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e320
Mileage on it 78000, oil being changed 10 k miles plugs changed already still the same also there’s no fault codes oil type I don’t remember but I buy it from Mercedes dealership for specific vin number of the car . On neutral the car work perfectly no vibration at all and there is no oil consumption maybe half the bottle missing (maybe cause there’s small oil leak I saw) the engine idle perfectly does not jump
You are feeling engine vibrations at idle in "D" despite all new mounts, no misfiring or code.
Because this vibration happens vehicle stopped, we can mostly rule out 4Matic bearings to focus on engine itself -- Vehicle drives with stock vibration under load.
I believe vibrations are caused by uneven cyl. contributions. Possibly injectors, ignition, A/F mixture, leaky cyl.
Pls record a 30sec sound at a fixed 1000.Rpm in Park to hear how well engine is running.
Because this vibration happens vehicle stopped, we can mostly rule out 4Matic bearings to focus on engine itself -- Vehicle drives with stock vibration under load.
- What is vehicle current mileage ? (120k)
- What are the LTFT: 1;2 ? (lean)
- What were recently services items ? (plugs,...)
- How often is oil replaced ? (5/10k)
- What oil grade/type ? (w30/w40)
- How much oil is consumed between service ?
- what is engine response like after clearing faults ??
- Can you bore scope cyls. #4 ? (smooth, scored)
I believe vibrations are caused by uneven cyl. contributions. Possibly injectors, ignition, A/F mixture, leaky cyl.
Pls record a 30sec sound at a fixed 1000.Rpm in Park to hear how well engine is running.
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Joined: Aug 2010
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e320
Th car mileage now 78k ,Transmission oil change have been done around 65k miles. Differential oil never been changed
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Joined: Apr 2019
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Mileage on it 78000, oil being changed 10 k miles plugs changed already still the same also there’s no fault codes oil type I don’t remember but I buy it from Mercedes dealership for specific vin number of the car. On neutral the car work perfectly no vibration at all and there is no oil consumption maybe half the bottle missing (maybe cause there’s small oil leak I saw) the engine idle perfectly does not jump
It would be beneficial for your engine protection not to run old oil for recommended 1Yr 10k service schedule. 5,000.Mi is a prefered interval.
Last edited by CaliBenzDriver; Apr 11, 2026 at 01:26 AM.
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From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
While stopped in D or R, you got the vibration, but not in Neutral.
Is the vibration strong and get stronger as wheel speed or engine RPM rises ? .......but you said that when it DRIVES it is perfect.
Who replaced your engine mounts (2) and tranny mount (1) and are they genuine Mercedes Benz ? But your replaced twice, twice in how many KM or miles of ownership ?
Tell us the backstory.
How may miles when you got this car and how many months ago ?
This vibration thingy is new to you or come with the car when bought ?
M276.8 3.0 Turbo is super smooth engine at idle or up to 4,500 RPM ish, when its induction system starts roaring.
========
What is your engine idle speed at brake hold in D or R when airconditioner is on ?
It should not be lower than 550 RPM, otherwise engine running too low an RPM can "shake" when in brake hold at D or R which is a loaded state.
Note : I am using OBD2 digital tachometer which is very precise to show 550 RPM. I suggest you do the same using a scanner , as the analog RPM gauge is not good enough for idle RPM check.
Is the vibration strong and get stronger as wheel speed or engine RPM rises ? .......but you said that when it DRIVES it is perfect.
Who replaced your engine mounts (2) and tranny mount (1) and are they genuine Mercedes Benz ? But your replaced twice
, twice in how many KM or miles of ownership ?Tell us the backstory.
How may miles when you got this car and how many months ago ?
This vibration thingy is new to you or come with the car when bought ?
M276.8 3.0 Turbo is super smooth engine at idle or up to 4,500 RPM ish, when its induction system starts roaring.
========
What is your engine idle speed at brake hold in D or R when airconditioner is on ?
It should not be lower than 550 RPM, otherwise engine running too low an RPM can "shake" when in brake hold at D or R which is a loaded state.
Note : I am using OBD2 digital tachometer which is very precise to show 550 RPM. I suggest you do the same using a scanner , as the analog RPM gauge is not good enough for idle RPM check.
Last edited by S-Prihadi; Apr 11, 2026 at 04:27 AM. Reason: ADD INFO
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(2008 Audi a4 Quatto 2.0t S-line)(2016 E400 Coupe)
make sure your battery is topped up, I trickle charged my 2016 E400 battery overnight and my engine idle much smoother, had better throttle response and downshifted better going up hills. Recently replaced my transmission mount at 65k miles. Turns out I may not have even needed one much yet. These batteries being at high voltage are very crucial for these Mercedes.
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
BATT FLOAT EMPOWERMENT
make sure your battery is topped up,
I trickle charged my 2016 E400 battery overnight and now :
my engine idle much smoother,
had better throttle response and
downshifted better going up hills.
Recently replaced my transmission mount at 65k miles. Turns out I may not have even needed one much yet.
These batteries being at high voltage are very crucial for these Mercedes.
I trickle charged my 2016 E400 battery overnight and now :
my engine idle much smoother,
had better throttle response and
downshifted better going up hills.
Recently replaced my transmission mount at 65k miles. Turns out I may not have even needed one much yet.
These batteries being at high voltage are very crucial for these Mercedes.
WILLKOMMEN to the club of advanced users.
These chassis are seriously voltage sensitive... That's both ways:
- higher
- lower
Even without Bosch variable voltage "ALT-LIN MOD" powertrain still responds to batt. floating.
There is an interesting root cause that needs to be uncovered right there.
Something about :
- F32 power distribution
- Undersized wiring harness
- marginal connections drop voltage
- ECU specific circuits: coils + piezo...
- .??.
What should we do to help identify that ?
create a new thread to swap notes & progress.
How many members out of warranty can handle non-standard exprimental VOLTAGE testing (near 14.15V) ??
As far as I know... this poor voltage control helps derate the engine block single coolant temp circuit (besides the internal mapped tStat control).
Last edited by CaliBenzDriver; Apr 11, 2026 at 08:12 PM.
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I'm experiencing the same issue with my 2022 E 400 4matic, it's a subtle vibration that seems to be coming from the front end, have you tried cleaning the sensor that controls the 4matic system or checking for any loose parts in the suspension?
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Joined: May 2018
Posts: 6,651
Likes: 6,598
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
200% brilliant observation!
WILLKOMMEN to the club of advanced users.
These chassis are seriously voltage sensitive... That's both ways:
Even without Bosch variable voltage "ALT-LIN MOD" powertrain still responds to batt. floating.
There is an interesting root cause that needs to be uncovered right there.
Something about :
What should we do to help identify that ?
create a new thread to swap notes & progress.
How many members out of warranty can handle non-standard exprimental VOLTAGE testing (near 14.15V) ??
As far as I know... this poor voltage control helps derate the engine block single coolant temp circuit (besides the internal mapped tStat control).
WILLKOMMEN to the club of advanced users.
These chassis are seriously voltage sensitive... That's both ways:
- higher
- lower
Even without Bosch variable voltage "ALT-LIN MOD" powertrain still responds to batt. floating.
There is an interesting root cause that needs to be uncovered right there.
Something about :
- F32 power distribution
- Undersized wiring harness
- marginal connections drop voltage
- ECU specific circuits: coils + piezo...
- .??.
What should we do to help identify that ?
create a new thread to swap notes & progress.
How many members out of warranty can handle non-standard exprimental VOLTAGE testing (near 14.15V) ??
As far as I know... this poor voltage control helps derate the engine block single coolant temp circuit (besides the internal mapped tStat control).
Has to record StuggardtHorses voltage and amperage as per Instrument cluster during the "vibration" or not smooth idle, to see if he is seeing much deficit from battery and/or alternator in ECO mode.
Charging battery overnight ..........IF the deficit part with LIN connected on the alternator is still happening, it is only a delay mechanism and not a proper cure.
Remember my hot alternator load test, only 60 amps capable the 200A alternator is, when engine/alternator is hot already and brake hold in D at 550 RPM. If 600 RPM or more is okey, alternator can catch up.
This is with LIN disconnected, I don't know if with LIN connected will it be worse ?
NOTE : This is HVAC blower at max, usually a LIN connected alternator will react with maximum alternator power.
https://mbworld.org/forums/e-class-w...soak-test.html
What I am trying to say is, it does make sense if our aging alternator or very screwed up ECO charging profile is causing power deficit for combustion and engine management,
when at the right time where the electrical load is HIGH at that LOW idle brake hold RPM.
Heat soaked alternator capable of only 60 amps at 550 RPM in brake hold D or R already causing deficit, for a cold country car with lots of electrical heater power is quite a trouble.
Last edited by S-Prihadi; Apr 12, 2026 at 02:29 AM. Reason: ADD INFO
