Jerseyjules

I have a 2006 AMG with 75000 miles on it and at time I feel like the transmission is kind of the bleh part of this car. in Sport or comfort it doesn't seem to have the response I would expect. On a few occasions, most recently just now at cruising speed 30-35mph I gave it a fast stab of the accelerator pedal and the car revved, didn't really accelerate and then seemed to BANG into gear, was very weird. Was not a transmission slip otherwise it would have redlined, more like an extreme lag then downshift and noticable bang.
. It's not the transmission or motor mounts those were just done. What are some common things to look at on the drive line or actual transmission. The car has no codes at all, none..

E55KOMPRESSED

https://mkultraelectronics.com/produ...03-06-e55-amg/

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Jerseyjules

I don't understand what a TCU tune is going to do for me if I have a mechanical failure, which is kinda what it felt like.

MJBelcher500

You might want to check the fluid level (you will need to buy the tool for that). If the transmission has been leaking a low level might be causing your issue.

Jerseyjules

Is that the same tool used for the oil level? Or do I got to buy another special Mercedes tool to check my fluids well?

MJBelcher500

No, the transmission tool is different.

Jerseyjules

great....😂😂

MJBelcher500

They are cheap. Under $12

C_Note

what amg do you have, 55 or 63? If it’s a 55, that’s just kinda how they shift… The lag and “bang” you describe sound like supercharger engagement. At 30-35 your rpm’s won’t be high enough to get boost on initial pedal push! You won’t make boost until 2200-2500 rpm and up. At around that rpm the supercharger kicks in and may feel like the “bang” of a downshift.

The clutched sc pulley takes some getting used to. There is a slight amount of “lag” to it. I have a fixed pulley that gives almost instant boost. Boost comes on MUCH sooner than a clutched pulley. I’ll never do clutched again

Jerseyjules

Well one thing I did notice is that my locking transmission filler cap is completely missing from the car. I guess I bought it this way and never really looked. So I'm assuming over the years of that missing there has to be some moisture and dirt in the fluid so I just ordered a fluid change kit and I'm going to do that this week. I'm pretty sure it's running on the original fluid for 75,000, miles. For not I added under a half of quart just to be safe till my dipstick arrives. I'm sure the fluid is dirty, burnt and low...lol

machild

You may want to also replace the conducter plate and the bushing (electrical connection) as both at this point can be an issue. The bushing can allow trans fluid to migrate up to the TCU and ruin it. Service time for the trans is 40,000 miles. Early is never a problem.

Jerseyjules

What I did observe is that if I go into manual mode in 2nd or 3rd and stab the throttle, no bang or anything, the car just accelerats. In S or C mode of you stab the throttle fast it bangs pretty harsh. Like the transmission is very sluggish and then grabs and the acceleration feels kinda crappy. Of I got WOT it shifts fine then if I let off before redline it seems to hang up in that particular gear till I slow way down...
Is it just that they have crappy feeling transmissions??

nd-photo.nl

Things to consider:
-Fluid refresh
-Filter change
-Conductor plate change
-Transmission solenoid O-rings
-Adaptation reset

Adaptation reset is easy to try as a first step

Jerseyjules

Did the reset, still bangs.

machild

Certainly the late shift issue as you describe when you let off the throttle is a typical issue with this trans. Also, unpredictalbe upshfts at or near full throttle whether in auto mode or manual. The trans control module mentioned in post #2 in this thread has resolved all of those issues. But, as you have noted, the trans has to be free of issues. A full trans service can make a big difference.

nd-photo.nl

Ah ok, too bad. Also see this thread btw:

https://mbworld.org/forums/c32-amg-c...em-solved.html

UncleBenz55

Is this the 5G or 7G?

machild

He has a CLS55, so 5G.

JT1982

I had an issue similar to what you're describing in my 2004 E55. I, meaning the mechanic, replaced the valve body and some other associated component. $2K later, problem solved.

Jerseyjules

I read most of this thread and it sounds like the issue I'm having. I might replace all the solenoids. Might even look for an entire built valve body..I do all my own work and this looks pretty easy, hardest part is getting the car on Jack stands.

Jerseyjules

Read that thread he linked above. I'm pretty sure some of the solenoids can be problematic and easily swapped out.

nd-photo.nl

I will also probably do that the next time I will service my transmission. Also have some jerkiness here and there, but I know from last time the O-rings could be in better shape and then it might be even better to renew the solenoids as they are 17 years old

Jerseyjules

Does anyone know if going from a 30 sidewall rear tire to a 35 effects the shifting that much??

Jerseyjules

So just to update, I got my dipstick tool and was about a quart low. I added a quart and the transmission seems to be shifting much better. I do get that harsh engagement of the Supercharger in 1st gear under certain throttle percentages. If I drive the car normal it feels fine, if I beat the **** out of it it also feels fine. It's when I drove the car anywhere in-between old man going to bingo and meth head police chase, is where it feels kinda wonky. also probably gonna need to do either rear differential mounts or flex discs soon. I feel a little bit of a bang from the rear/underneath when I stab the throttle to a downshift. 🤷🏻‍♂️🤷🏻‍♂️🤷🏻‍♂️

MJBelcher500

If it was a quart low you should be checking for the leak. It is probably leaking out of the electrical plug. Check to make sure the TCU is not soaked in fluid.

My car has the occasional rough engagement of the SC in first gear at "just the right throttle". It does take a little getting used to.