C6309

Hi mbworld new to the site I just bought a 2009 c63 2months ago just did the 10000 mile service on it and had a tranny seal replaced I got the car back today and it seems slower then when I dropped it off not sure why It doesn't pick up as fast as it did before wen I floored it before it put you in your seat no matter what RPM or speed now it doesn't I can say the car did run rich before I dropped it off could it be the owner before me had a tune that's why it ran rich idk what happened can anyone help thanks

stangxs

Most likely had a tune, and the dealer reset your ECU to factory settings.

Either that, or they swapped your 6.2 for a 3.5

abcut973

So you had the transmission fluid changed and an oil service?
Normally MB will not play around with the ECU unless you ask them or they had to update the transmission software. In this case they might have reset your ECU. Ask them and you will know.
Did the seller inform you about a tune? Unless you know or you have read the ECU it is difficult to say if there is a tune on a car.

C6309

I bought it from a dealer so they don't know the past history on it I will contact MB and ask the service advisor if they reset my ecu thanks guy for the help and tuning a stock car does that really do anything

C6309

just talk to service advisor and they did nothing to ECU

Ingenieur

You 'feel' the car is slower
The butt dyno is not accurate
It's most likely all in your head

whoover

It's possible that some transmission adaptations got reset when they pulled the transmission. It's the famous "battery disconnect reset." If the car had been driven very aggressively, the reset would tend to make the shifts more tame.

If that's the case, just drive it hard for a few days and it will relearn your driving style. Those shift adaptations can make a difference in the perception of power.

Paculdo

for these ECU updates (or transmission updates) - should these be listed in the invoice?

Ingenieur

Usually
That wsy they can charge for them

You need a tool to do them
And they have to drive the car for a while for each gear

How many miles difference between in and out

whoover

Adaptations are not updates. They're the transmission learning the driver's style. They can be lost if power is cut to the TCU. They'll come back. It's not a software change, just a normal result of disconnecting the battery.

Ingenieur

disconnecting the battery will not erase the adaptations
at least in our TCU

and there are updates (TSB's, campaigns, whatever you want to call them) that perform an adaptation

eg, there were complaints about the 2-3 shift so if the customer complains about it the TSB says to run the adaptation routine for only that gear change
basically hook up the tool and erase/reset the old (only for the 2-3 shift)
drive the car at steady rpm, light load and shift 4 times 2-3 (some say 8 times)
park and let idle for > 10 minutes

there are settings for each upshift. each downshift and park to 1st and park to reverse iirc

whoover

Both the TCU and ECU have long-term adaptations and short-term adaptations. The former are stored in non-volatile memory while the latter are lost when power is disconnected for an extended period of time. The management computers apply short-term adaptations using long-term adaptations as a base. If the short-term adaptation gets large enough, it will be used to reset the long-term adaptation as the new baseline. Different management systems have different sets of adaptations, but the many, many people who report temporarily changed behaviors after a battery pull (either better or worse) are not crazy.

This is a great reference for people without access to the MB DAS system documentation:
http://www1.snapon.com/Files/Diagnos...AZ0025B41C.pdf

Ingenieur

in response to a querey about adaptation

ETC (TCU) Reset/Adaptation: 722.6xx
MBDoc
Moderator

Clearing the trans adaptation requires a "HIGH END$$" scanner like AST, Baum, Autologic, Car-soft, or the dealer SDS.
None of the listed methods will clear the codes OR adaptations. (the listed methods were - scan tool clear, batt disconnect, tps reset (ignition key/accel pedal reset), and the HVAC head unit code clear methods)
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)

whoover

That's talking about non-volatile (long-term) adaptations. A quick search will find dozens of people who have done resets of short-term adaptations with obvious results. I know I used to reset both my S65 and C55 often when my wife had "broken" them. The major adaptations can't be touched by anything but a DAS or equivalent, but there are plenty of short-term adaptations that have a noticeable impact on how the car behaves.

Ingenieur

he is talking about ANY adaptation period

the short term stuff is reset everytime you restart the car and will adapt with style during a given trip based on throttle use, shift mode, l,oad, etc.

whoover

Just to be clear, your opinion is that the MANY threads like
https://mbworld.org/forums/w211-amg/...set-works.html

and

https://mbworld.org/forums/cl55-amg-...-response.html

all represent mass hysteria?

Note that some of these include recommendations from MB techs to use the battery disconnect method rather than the accelerator pedal method, for instance.

Ingenieur

Not mine

This guys


MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)