Bezc63

Hi all,

Have been looking for a fair amount of time now and have found no definitive answer.

I picked up my C63 AMG PPP 2 months ago from a reputable dealer. It is still under warranty. 50k miles, mid 2011.

Im absolutely loving the car but have noticed that under partial throttle i get some vibration for a few seconds (the same feeling you get when you drive on the hard shoulder of the motorway) and the revs are inconsistent. Initially i thought it was the tyres but then i would notice it at other speeds.

It never has this issue when in neutral or being driven hard, but it is especially noticeable under partial throttle when going up a hill for example.
This is in comfort mode. It kinda feels like the gearbox is struggling at low revs and cant change. The power kinda stops while the vibration is happening and then it gets a gear and its all back to normal. It has happened a few times too when braking but nowhere near as often.

It doesnt really effect me but i seem to notice it a lot and im wondering what the issue is.

In summary:
Vibration and rev inconsistency at low RPM moderate throttle - hills especially
No issue at full throttle or neutral

Any ideas? Want to get this sorted under warranty.

Regards

- Bez

mr747

engine mounts maybe

Tonytoonz

99% sure its your torque converter. Mine does same. Does it at same rpms at all times on light throttle.
But.....check your Flex Discs on your driveshaft. Easy cheaper fix to try first.

thebug44

so you have to replace it? It happens to me too on my 2012 but not a big deal... I thought it was engine mounts. my car has 38k miles

G_Money

A 2012 doesn't have a torque converter.

Clutch packs are due at 40k mi tho.

thebug44

that just sounds expensive

G_Money

Well, it's not cheap.

BLKROKT

Clutch packs at 40k? First I’ve heard that one.

It’s likely your motor mounts or flex discs.

Jasonoff

Can you show everyone where in the service booklet that is stated?

https://www.mbusa.com/vcm/MB/Digital...ce-Booklet.pdf

Bezc63

Hi all thanks for responding.
I convinced myself that it was the spark plugs or an engine missfire that was causing the issue, but I just had a service today (new spark plugs, oil, filters, brake fluid) at a MB dealer and the issues still there. I never get CEL and no codes show up on the code reader.

In the UK we had the facelifted 204s since 2011. Mine is mid 2011 and is facelifted, new head bolts etc and engine number over 67000. Im almost certain it is identical to the 2012 onwards which is when the US got the facelift. I've been looking around and these cars have a wet clutch and not a torque converter so that can't be the problem.

I've therefore narrowed it down to two issues, and after searching the flex discs sounds like that's where the problem lies. I get vibrations that feel like they're coming from under me rather than the engine and when in manual or under full load it shifts perfectly so it's not a wider transmission problem. I'll look into engine mount issues but I will get it taken to a shop within the next few weeks and get this diagnosed and fixed, and feed back. Thanks for your help.

roadkillrob

What the crap are you talking about, there is no clutch pack replacement that is due and they generally last the life of the car.

Fluid is do at 40k but that is about it for trans maint around that time.

sventastic82

I know what the issue is.
its a design flaw, the steering wheel is on the wrong side.

Bezc63

Hahah

Bezc63

The thing that causes me to wonder is why it never happens when the cars cold or doing short journeys. I drive to the station every day which is about 2 miles and I NEVER get this vibration, whether going up a hill or whatever. Only when I drive to work and get the car up to temp and speed does this occur, and only under partial load when accelerating, not standing still or full throttle. I guess we will get it sorted soon hopefully.

princemarko

Same issue I had with my CL.. change tranny fluid

Bezc63

Thanks for the suggestion, this would make sense. Got it booked in at an indy on Friday who can check the basics. If no joy I'll take it to main dealer.

princemarko

make SURE they drain torque converter fluid also. You should notice a difference within 20 miles as new fluid cycles through.

Bezc63

Don't have torque converter mines a facelift with wet clutch (we got facelift cars from 2011 onward in UK, it's a 2012 equivalent in US)

princemarko

Had same issue with my CL63. Changed flex disc, Carrier mount, tranny mount and engine mount... Change your fluid and make sure they drain the torque converter fluid also. check the fluid with magnets and you'll see the fluid will be very dirty(hopefully no metal shards).

Bezc63

Don't have a torque converter on my car (it's a facelift UK C63)

BLKROKT

Maybe it’s your torque converter, I hear the fluid can get really dirty

Bezc63

You're a funny man

princemarko

clutch pack still gets dirty and causes shudder. Changing the fluid helps tremendously

Bezc63

Yeah just checked service history and last time transmission fluid was changed was 6 years 35k miles ago... Taking it to main dealer next week, will take the technician out to recreate the problem and get him to check fluid first before anything else

anthony02tolson

Im having the EXACT same issue with my w205. Please tell me it was a easy fix haha appreciate it!