ENV²

As you all know I had a lot of what feels like misfires and taps through brake pedal and a few other things. I met a AMG master tech and took the car into his dealership for him to work on. He replaced the intake manifold gasket, adjusted my wiper blades (they were stuttering across glass), cleaned and adjusted rear brakes (squeaking) then he ran full diagnostics on car. Found a code for malfunctioning MCT temp sensor. Benz instructed him to replace the valve body in my car and drain and fill trans + replace filter. He also swapped a couple of coils and plugs to the other side to see if the misfires were due to the intake gasket leak.


Now that I got the car back I still feel the tapping/roughing idle through the brake pedal. The car shakes at idle, not a lot but every few moments at a dead stop you can feel the sway/shake of the motor. I feel like the replacement of the gasket didnt really solve much. It is an odd feel in the pedal like the motor surging and tapping/knocking into the pedal and it only happens at dead stops. Not sure what it is and no extra codes showed up. I will run codes myself at the end of day.


The transmission valve body replacement needed to have the tech and another guy go out to set the adaptations for the car. I got the car back now and it seems in S mode it shifts very abruptly and early. Hard to explain. Also when rolling from a stop there seems to be a almost stalling feeling hop I didnt have before. Its very suddle but noticeable to me. Not sure if this is the way the transmission reacts normally and my malfunctioning sensor in the old valve body was making it smoother.


I really need to figure out what the damn tapping.knocking is because it very much annoys me. Am I feeling the transmission through the pedal? Is that normal or is it something else?


The tech said all he can try to do is replace motor mounts and trans mount but when he looked at them they looked fine.


Anyone have experience with this? Is the car normal like this or should I take it back?

INS1GNIA

Reset your ECU first. The procedure to reset the ECU is as follows;

1. Turn the igniiton key to the "on" position which is just before you crank the engine to start.
2. Press the accelerator to the floor and hold for 5 seconds.
3. Then turn the key to the off position but do not remove the key, then release the accelerator.
4. Wait at least 2 minutes, the ECU is then reset.
5. ECU is now reset and you are ready to get new rear tyres.

The ECU rest procedure only erases the adaptive transmission and throttle settings. It does not erase any of the fuel, timing or other programming.

Read more: Easiest way to reset my ECU

I feel the same thing through my pedal...perfectly normal, it actually relaxes me.

CarHopper

My friend, I suggest you offload this car. It's been looked at many a time. You've had quite a bit of good advice from here as well as had master techs look the entire car over.

Your hard shifts is due to a new TCU that hasn't adapted to your driving style. Do the reset INSIGNIA said. Then drive it. The car just has to adjust to your driving style.

As for the tapping and happening "not a lot," well, once again (if I recall correctly) this is the largest displacement car you've had. There is A LOT of energy and weight and moving parts going on 2 feet in front of you. I get the tapping sometimes at stops too. It's a big motor problem.

Look. The techs says you're fine. The car says you're fine. You don't have CELs or any of that going on. Your only symptom right now is that pedal tapping which many of us said to you is normal and we experience too. Either get used to that, install hand brake/acceleration controls on your car, or get rid of it. Some people just don't end up liking things as much as others.

Good luck moving forward man.

BLKROKT

^ Word

Jasonoff

May I suggest a... http://www.toyota.com/prius/

They're SUPER quite at stop lights...

CarHopper

^ Lets not get too crazy or mean here. Just some things don't turn out to be a fit for some people, that's all.

Jasonoff

It's just an honest suggestion. I have first hand experience being in a Prius. The dead silence at stop signs/lights/traffic is eerie...

c63buckeye

not helpful bro and to say that's an "honest suggestion" makes you look even more foolish.

he's simply asking a legit question about a legit issue that he has.

Durban

Im not sure how aggressive you're car is shaking at idle. However there is definitely a little bit of a shake/rumble when sitting still in almost every c63 I've been in. Thats just the way it is. You should feel what a car with stiff engine mounts feels like at idle...

Anyways, its hard to say if you have problem or not without being in it. But if the car is running just as good as always under power, and sounds like it should all the way through the power ban, than I'd say you're overthinking the slight shake.

Thats just my opinion. Take it or leave it.

Jasonoff

You're a prius racist..

beejAMG

^ stop it. everybody who can read knows what you meant with your first post. trying to be cheeky but came out an a$$.

OP: i do have the same feel on my 63 but as to the extent of the shaking at idle, like Durban said, cant tell unless were in your car. im assuming yours is stock so if you can find another stock 63 owner so you can compare, thatll be best.

I use my E sedan as a daily so when i jump in the 63 on weekends i feel the difference straight away...in a good way!

Jasonoff

ENV²

Hahahah ok guys I apologize as yes it has been gone over and things were changed. I noticed I am not misfiring as much as I was with the leaky gasket. The reason it pushed me to make this thread today is because sitting at lights it takes about 5 seconds before the tapping in the pedal starts. Today though it was almost audible if I turned the A/C and radio completely off, pull up to a stop, 5-7 seconds and the knocking on the brake pedal starts and i could hear it through the vents every time the tap came I heard a knock knock.

Could this be a symptom of bad motor mounts (for those that have had bad mounts in the c63) or bad trans mount?

Also my torque app seems to show a few odd things. I will post them up on here and see what you guys can tell me.

solekeeper

haha^

ENV²

So thats the only tests that always seem to come up red on the Torque app although I dont know if these are the reasons the car is acting this way. I will be adding a bottle of techron to the gas tank once its near empty tomorrow.

Any insight?

BLKROKT

1 bottle won't be enough. I would add 8-12 bottles of Techron to fix all those codes.

ENV²

Not sure if being sarcastic or serious. Do you know specifically what these mean? There are no fault codes stored in the car (checked multiple apps) but these are shown during monitor tests while car is running. I was just goin to add techron to rule out bad gas.

Do you know what these mean and what my AMG guy may need to do?

Jasonoff

You know what you are? You're a feelings hurter...

Gerry_M

What is Bank4? Is there a Bank4?

BLKROKT

INS1GNIA

"Do you know what these mean and what my AMG guy may need to do?" Your AMG guy needs to slap you. Just drive your car and enjoy it, stop searching for a problem when there isn't one. Unless something breaks, your car starts spewing blood out the vents or it comes alive and starts eating children, keep that pedal to the floor and don't worry as much.

mthis

google "italian tune up" i find when i baby my car it has does symptoms. then when i get on it, it loves it .
go on a safe place where u can do few runs and see how it feels. few runs means like 8-10 going thru 1.2.3.4th gear.

m a x i m u s

Agree. When I go a period of time in stop and go traffic, the car feel like crap. When I beat on it and/or go on freeway road trips, the car feels great afterwards.

C63amg Tokyo

I agree with what most of the members have said about it being a big engine. I've owned two 63's and both would shake a bit when stopped. Hard for anyone to know how severe what you describe is "tapping on the petal" or "sound through the vent" but with both my engines the car would shake a little bit. Nothing that I could hear loudly through the vents or anything and nothing that made me feel something is wrong. If you really feel something isn't right, Perhaps try driving a few different 63's? Head to some used dealers and test drive. If u notice a massive difference then dump/ swap your car before something does happen. Hope it all works out, the 63 is such an amazing machine.

m a x i m u s

I have one suggestion. Once in a blue moon, I will not have my foot on the brake 100% at a stop light, and the car will creep forward a teeny teeny tiny bit, which sometimes causes a mild wobbling feeling through my pedal as my rotors move between the pads (yes, I know my rotors are in need of replacement soon). Perhaps this is what you are experiencing? I thought at first that it was the engine idle, but I have been able to reproduce the feeling.