Hi all, new to all this but i got an issue that need help with on a c220 cdi

[Calcs]

I Got a rumble and slight judder when accelerating over 40mph. I jave had a full diagnostic and nothing come up. They did say I need front right drop link soon but could find the issue. Another mechanic said there wasn't an issue with it. I think I'm going mad but it's definitelythere. It's more when accelerating over 40 50 mph and you put your foot ( on motorway ) It's like a rumble and slight judder / vibration. You hear it but no loss in power.

 

[davemercedes]

I recently had a similar problem on my 2007 C-Estate (S203). I was rather suddenly aware of a judder when braking fairly hard. It was irritating because my main pleasure with the car has always been its "refined" feel - I used to comment that although the years had gone by, it still felt like driving a new car.

Cutting this story short, new pads and discs solved the issue totally so I feel like I have my "new" car once again. Buit's at least 8, maybe 10 years since I had them replaced previously so the annual cost is bearable.

I'm sure you'll find a reasonable solution, Calcs. Good luck!

 

[Taffy7hfa]

Worth having your tires checked, low speed shimmy through the steering wheel can sometimes be tires.

 

[mioba]

Could be many many things.

I would first question your mechanic who says nothing wrong, when you clearly know there is something wrong being the person who drives it all the time. The owner of a car knows always when something doesnt seem right.
Could be suspension related, drive shaft, mounts, any of the above. Not helpful I know but it. really needs going up on a lift for a good inspection.

Are the mechanics MB indies, Did they get the car up and inspect or just run a diags via a code reader.

Good luck. you will get there!

 

[Calcs]

It's not the breaks or tyres, there all good and checked, but thanks for the input. It's was a full diagnostic, found a minor problem but nothing to do with the mechanics. The car went up in the as well, what they did I don't know lol. They did think drive shaft but said it was all OK and they did say the drop link is on its way. Most of the time it's OK but if you on a motorway and over take that's when you feel it. The car has been taken out and driven but they said it was OK.
I think I'm going to get them to run it down the motorway.
Going to get a friend I trust to look at the MAF sensor, egr values, injectors, turbo pressure sensor, cv joint and exhaust manifold as that breaks down. That's the list I found so far.....

 

[Droverunner]

Is it only under power, does it totally go as speed levels off? Who has decided tyres are ok and with what checks?

 

[SmartAmg]

Welcome.

 

[Calcs]

Is it only under power, does it totally go as speed levels off? Who has decided tyres are ok and with what checks?

There new tyres and balanced. It's only under power when you first put your foot down, mainly forth and fifth. As soon as you ease off it seems OK. You can Just about feel it on cruise control when you hit a hill. It's like a rumble and almost a judder, not a miss fire. My head is telling me you can push through it, so maybe it's only a second or two. Not sure if fuel or air. I trust the people who have looked at it. Its fine under 40 and acceleration at and under this. I need to get them on the motorway really I think. The car came from a Mercedes Specialist and had a b service a year ago and less than 1000 miles done since

 

[Droverunner]

New tyres make it less likely they are the problem but tyres can give some really odd effects and I've known folks change shock absorbers, wheel bearings etc and then find the problem was a tyre that was balanced but had a tread distortion. In many ways tyres are often the cheapest way and step one to resolve a vibration fault so I look super hard at them by jacking up and rotating each tyre against a fixed pointer across the whole tread and the sidewalls.

A buckled alloy can do the same.

It ought to be possible to separate the feel to be either engine induced or drivetrain related. If drivetrain and tyres OK then thoughts might turn to the transmission, propshaft, diff and driveshafts.

 

[Calcs]

New tyres make it less likely they are the problem but tyres can give some really odd effects and I've known folks change shock absorbers, wheel bearings etc and then find the problem was a tyre that was balanced but had a tread distortion. In many ways tyres are often the cheapest way and step one to resolve a vibration fault so I look super hard at them by jacking up and rotating each tyre against a fixed pointer across the whole tread and the sidewalls.

A buckled alloy can do the same.

It ought to be possible to separate the feel to be either engine induced or drivetrain related. If drivetrain and tyres OK then thoughts might turn to the transmission, propshaft, diff and driveshafts.

Mmm not sure if buckled wheel but would assume you would feel it at cruzing speed and not just under acceleration?? They did check the prop and drive shaft, all OK. Also advised drive chains OK. Personally I think its engine end. The guys have been all over and I trust them, just no roads local to put your foot down. I have read it might be a exhaust manifold breakdown which causes issues with the turbo???

 

[LostKiwi]

If 5he problem has 9nlynbern there since new tyres fitted there is your answer.

 

[Droverunner]

I'm a bit "tyres first" obsessed when I hear of such problems as I've seen the tyres quickly skipped as "they balanced OK" many times.

Example... I bought an Audi A3 for daughter from the middle of the city and didn't test drive as the speeds I could have achieved would have been meaningless. On collection and leaving the city over 50mph a vibration started that felt like the driveshafts were about to come through the floor, much worse under power. Tyres all OK and the fronts (Chinese) quite new with balance weights still shiny. For a moment thought I'd bought her a dog needing a new transmission or something. Quick check of tyres jacked up and spun against a pointer showed some out of round on the fronts so for initial test swapped front to back. With them off the driven wheels an 80% improvement. Fitted new set of decent tyres and it was totally smooth.

 

[pgh13]

When was transmission fluid and filter last changed?

 

[5w155t0ny]

Got a s

It's not the breaks or tyres, there all good and checked, but thanks for the input. It's was a full diagnostic, found a minor problem but nothing to do with the mechanics. The car went up in the as well, what they did I don't know lol. They did think drive shaft but said it was all OK and they did say the drop link is on its way. Most of the time it's OK but if you on a motorway and over take that's when you feel it. The car has been taken out and driven but they said it was OK.
I think I'm going to get them to run it down the motorway.
Going to get a friend I trust to look at the MAF sensor, egr values, injectors, turbo pressure sensor, cv joint and exhaust manifold as that breaks down. That's the list I found so far.....

similar thing with mine and I am leaning towards an engine or gearbox mount as the resonance is only at certain times under a specific engine load.
Definitely think it is a rubber bush or mount of some kind.