wanchu83

Do your W204 does this?
when I go in to praking garage and pull up and stop and put on R and press the gas, the car just roar little bit second and gear will grap very roughly and backs up.
Ok it might be way I drive, but it's so slow changing to R and drive reverse.

Basically when I try to parallel park, pull up to next car, and stop(Almost completely), and put on R and press gas, then it won't back up till car is standing still and my car will jerk while gets into R and move reverse.

I drove lots of sport car and they goes in to R and able to go back right away, but C is slow response to changing to R.

Is it just me? or your cars too?

raver

Same here.

Agree that its reverse gear is much less responsive than other cars that I have driven...think it is intentional

german-anger

Should be just a slow response theres a second of noticable 'lag'. But you can easily adapt to it. As in shift into R and then within one second you'll be slowly rolling back.

Ron Jr

I have this once in awhile, usually when I am in a hurry.

f4i 954

I think there is a tsb on that, not to sure, i will due some research & post back if i find anything.

aowhaus

I never experienced this with my 2008 sport, but then again I had the software/transmission reprogrammed twice which may be the reason I don't experience it.

Recently I had a 2009 sport as a loaner and I really noticed the accerlation lag when going in reverse and I can't believe how noticable it is.

S204HONGKONG

I am from Hong Kong, and my car also has this irritation. It's much slower to engage Reverse than my previous car, an E46 330i

f4i 954

There is a tsb on this topic, but for model year 2009.
Make sure you got the latest transmission & engine softwere

wanchu83

My car is 2009 c300 sport. yay. Can you link the tsb for me?

451/443=EW

Yes I have had this issue too. But now it just stoped. Anyway MB doesnt yet have a flash to fix it, but rest assure your cars are fine and I personaly think it will be looked after in the near furture.

jamaicakevkev

This transmission is really annoying me... guess I wont keep this car 2 long... I think this 7 speed transmission is more complicated than need be... I find that when I don't stop completely that this delay happens... like when I am truly in a rush... Got my car with 16 miles and have hated the way it shifts from day one...coming from a few lexus models a SC-"soarer gt twin turbo" and a ES-"windom 3.0" that were smooth as silk the reliability of this transmission going forward is a major concern...

Glyn M Ruck

All Benz auto transmissions are slow to lock up in reverse. Just calm down the way you drive. The transmissions are bullet proof as long as you maintain them. Everything in a Benz is programmed for smooth operation. Even the aircom has a programmed delay.

With the 7G, while you should make sure you have the latest software flashed, you also need to drive properly & the two of you will get on much better. They like to be driven deliberately. Bad drivers who play yo yo with the throttle will never come to terms with them. Constant throttle variation will mess heavily with the learning on the box & have it hunting between gears all the time. If you want to apply 50% throttle then do that & hold the pedal constant & the box will perform as designed. On/off throttle actions are no good - you would be surprised how may drivers don't even realise they are doing it. It is also a big fuel waster.

tchockie

i have no issues with the 7G going forward, but to say that these electronic 7G gearboxes are reliably "bulletproof" is just wrong information. ask any tow service guy and they'll tell you that these transmissions are one of the top reasons to see our mercs on a flatbed. and its not all because these drivers are going crazy with their throttle all the time.

getting back on topic though, the reverse delay is very real and very annoying at time. in a casual parking lot it's not really an issue at all, but when you're parallel parking on a crowded narrow street with cars backed up behind you, that extra couple seconds seems like a very long and unnecessary lag. not to mention embarrassing when the car jerks back as it catches the gear.

it may or may not be intentional as many speculate, but its hard to believe that it's serving a really protective function. even after the lag, the gear catches rather abruptly. of course, waiting for the driveshaft to stop before engaging the gear is essential, but is it really doing that? then why is there no lag when you shift from rev to D?

Glyn M Ruck

Not so - As long as you don't think that the 7G is filled for life - these transmissions have already run up huge trouble free mileage in W203s & other models - the box has not changed. Benz make some of the finest auto gearboxes around. Even the 5 speed suffers lock up lag in reverse. It is crucial that you allow full engagement before you accelerate in reverse. There should be no lock up shock or you will indeed do damage over time.

The 7G is a proven & reliable unit in ROW where no filled for life claims were made. It needs an oil change at between 40 & 60,000 mile intervals depending on conditions.

OpAmp

I have this exact same problem, except the other way around, and it only occurs at an incline.

If I reverse DOWN an incline, stop, and then put the transmission into D, it doesn't get going immediately. There is a 2 second lag, followed by a noticeable tud, and then I can start moving.

f4i 954

If I`m correct You dont have a problem, its called hill assist, look in the manual.

OpAmp

Are you sure? This always happens even if there is the slightest incline. I'll check it out in the manual though...

f4i 954

Best way to check is at night, after you release the brake pedal (look at your brake light reflection on the ground) you will see that the brake lights stay on for 2 more seconds, or till you hit the gas pedal.
I notice all the time when i back into my garage at night (I can see in the rear view mirror that after i release the brake pedal, mi brake lights will stay on for a couple of seconds.

RLE

Are you a left foot braker?

RLE

Hill Start Assist works ONLY when the car is headed up an incline, in Drive, and it holds the brakes for 2-3 seconds after you lift your foot off the brake pedal. Just enough time to move your foot from the brake to the accelerator. If you fail to depress the accelerator, the car will roll back. it's been said that the E and S classes will hold the brake until the accelerator is depressed no matter what the delay but I have no personal knowledge of this.

Absolutely does not work on a downslope although some have imagined that it does on previous threads at least a year ago.

f4i 954

how does the angle sensor now if the car is in a downslope or incline?

whiteongrey

Had the same issues like lag in response and gear changing first few thousand miles - now 100% better

jstaneff

My timer's off then. I get upwards of 5-6 seconds before the car starts to roll backward, and more than once, it's just sat there for 20 seconds or more.