Lumpy acceleration?
 

I've got a 2014 E350 4-matric w/ 22k miles, CPO. I notice on mild acceleration up to say 50mph that sometimes it feels like it's "missing" or clutch is slipping. I doubt either is the case, as I've also felt it in Volvo and sedans. But I'm curious if it's transfer case related and pretty common for the car? I know some complaints about this transmission is commonplace in general and especially in the 3-4 gear area. Doesn't really bother me, but just want to confirm that it's normal, and/or anyone have any tricks to reduce it (say upgraded transfer case fluid?)

thanks!!

Is it turbo lag? I haven't really driven cars with turbos but I know people complain about turbo lag a lot.

14 e350 got turbos?

Oops, thought they transitioned to turbos the same time the E550s did in 2012 :B

I wish it had a turbo, that'd be sweet!!! I love love love turbos and what they do to the torque curve. My other car is a MK7 ('15) GTI that is one of my all-time favorite vehicles.

The lurchie (if that's even a word) feel of the power delivery at gentle acceleration in the MB feels like a transfer case trying to divide the power displacement. Hard to describe, but feels kind've rubbery like. It's not every time, and only in a narrow range of power delivery (little more gas, doesn't happen. Little less gas, doesn't happen). I don't think it's engine related (missing). I do note in the car fax history that around 3,000 miles the car computer was reporogrammed, so I suspect the original owner was trying to figure it out too.

Only some of 2014 E350 have this trans problem. When you bring into dealer they say they cannot duplicate it. I for one would never have bought the car had I known that it had this problem and MB has no solution. You learn to live with it. The best or nothing. Worst trans on a car I have ever owned out of about 30 cars.

I totally agree! I, too, have this crazy issue with my car. Of course, when you take it the dealership, they provide their overall generic answer: "cannot duplicate issue".

What they need is someone on this site must be a Lawyer and have the Lawyer open up a class action suit. I bet there are thousands of us with this problem. I know if the car was a GM vehicle it would have been on a recall already

So, I take it that I've centered in on the hot button for a few of us, eh? :-)

I can totally see how this would infuriate many who've got this issue. I'm not quite at that level with it probably because 90% of the miles I put on my cars are "cruise control" miles at 70mph, outside of the range for this problem. While not happy to see that it's a common issue and I'm not looking at an isolated issue with mine, I'm sorry to see that it detracts so much from the enjoyment of the car for others. Any specific idea what causes it? Is it the transfer case? Torque converter?

PS used to have a Volvo XC90. Every loaner I got while it was in the shop (a lot) had this same feeling but a 1,000 times worse.

Interesting to me (having never owned an MB before). So does this plague only the 4matics, or is this across the entire 2014+ E350 line? Does the RWD have the same trans and it's an AWD issue, or do the 4matics have different trannies?


Edward

one member had his dealer replace parts on the trans and it went away the other had the throttle control sensor replaced and it went away. I myself think it is the throttle control sensor is to sensitive. Just some dealers just do not care and use I could not duplicate the problem. You drop off car at 8:00 am and at 3 Pm you call about the car and they have not looked at it yet. Then you get the excuse.

no idea but I know only some of the 2014 e350 have the problem. I have driven some with no problem. some of us were just lucky to get the problem. The best or nothing.

Let's get together to file a petition. Maybe we can enact class action lawsuit. :naughty:

I would join

after my K1 Piston replaced, and transmission rebuilt, under warranty. and after 1000miles, I do feel the sensitivity in the acceleration (sometimes).


It is really hard to see what I'm trying to explain, because, the camera is windshield mounted and not much of a stationary object to compare with. But, from driver seat, for a split second, you feel like the vehicle is going to take off.
Is that the same you guys feel too?

Actually that channel was to note down flaws or features, looks like, I need a dedicated channel for Mercedes benz problems (recurring).

My rear parking sensors (not the cameras) doesn't work, even after hitting something.

My Bluetooth stereo still skips a beat (the SA simply says, they couldn't reproduce).

I sent an email to MB customer service, seeking help. The reply will decide for my future car purchases and relationship with Mercedes.

I know too much electronics is not good, but, shouldn't be this bad.

Is there any vehicle with electronics to the minimal and required, and everything else as manual in the past 5 years? Like essentials would be electronic: Steering, ABS (anything else?) and everything else should be manual, including transmission.

If not, my dream is to built one like that, which will never fail.
Porsche is similar to that, but, not reliable transmissions, I believe.

Sorry to hijack the thread.

If it is feedback, I wouldn't care, but, law suit, sounds attractive. It will make Mercedes listen I guess. So, I'm in.

The quick acceleration is what some of us feel

Well you guys are lucky. My "lumpy" acceleration is defined as laggy and hesitant.

I had this issue early on. The dealer found I was low on tranny fluid (at 17k miles) added about a quart and the problem has not returned.

Interesting...
Can you describe, precisely, what your exact issue was? I think some of us are experiencing the issue on different ends of spectrum and I want to make sure we are talking about the same thing.

Thanks!!!

The car hesitated, almost stalled, starting off from a stop in "C" mode. So the shift from 2nd to 3rd was way too early and caused hesitation, stumbling or 'lumpy' acceleration. This happened a number of times before I took it to the dealer. It is my understanding that shifts are partially controlled by the pressure of transmission fluid in various solenoids, I could be wrong, but insufficient volume of fluid would decrease pressure and cause early/mistimed shifts. Seems to make sense to me, but would love to have an expert explain how the transmission really works.

Oh ok, mine is not quite like that; it doesn't feel like it's gonna stall. I guess the best way to describe mine would be akin to being in the car with someone who has never driven a car before: they press and release the accelerator pedal once every .5sec over and over again because they are scared to give it too much gas (hence giving the feeling of buggy accel). Even though I give it constant, steady pedal input---it feels like it hesitates as if the throttle is electronically limited at 5-10mph.

Good description of what our cars do!!!! Same problem but cannot be duplicated

Thanks---I was hoping my description translated correctly. Glad someone else understands it. :y