No throttle response cold engine
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Joined: Dec 2016
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437 HP
No throttle response cold engine
Hello, After a cold start on my ‘17 C63s, while the RPMs are still slightly elevated, I put the car in Drive and gently press the throttle to move forward. The RPMs increase, but the car barely moves, almost as if it’s revving without properly engaging.
This only happens when the engine is cold. Once the RPMs drop back to normal, the car drives as expected. The RPMs usually settle after about 45–60 seconds.
Is this normal?
This only happens when the engine is cold. Once the RPMs drop back to normal, the car drives as expected. The RPMs usually settle after about 45–60 seconds.
Is this normal?
Senior Member
Joined: Dec 2025
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From: Keep it simple - keep it OEM
AMG C63s Coupe
Totaly normal !
No not normal - just a joke.
In coldstart the RPM is allways a little highter as if the car is warm. I never checked this on my C63s how it is.
That your car not move or slow move can be the wet clutch - maybe !
Make diagnosis with Xentry … check adaption values etc or something like that.
Have you this car new bought ?
Milage ?
No not normal - just a joke.
In coldstart the RPM is allways a little highter as if the car is warm. I never checked this on my C63s how it is.
That your car not move or slow move can be the wet clutch - maybe !
Make diagnosis with Xentry … check adaption values etc or something like that.
Have you this car new bought ?
Milage ?
Last edited by C63s_Jack; Mar 27, 2026 at 06:52 AM.
Thread Starter
Junior Member
Joined: Dec 2016
Posts: 23
Likes: 2
437 HP
Totaly normal !
No not normal - just a joke.
In coldstart the RPM is allways a little highter as if the car is warm. I never checked this on my C63s how it is.
That your car not move or slow move can be the wet clutch - maybe !
Make diagnosis with Xentry … check adaption values etc or something like that.
Have you this car new bought ?
Milage ?
No not normal - just a joke.
In coldstart the RPM is allways a little highter as if the car is warm. I never checked this on my C63s how it is.
That your car not move or slow move can be the wet clutch - maybe !
Make diagnosis with Xentry … check adaption values etc or something like that.
Have you this car new bought ?
Milage ?
Do you have any clue if it is common for a wet clutch to act like this?
I am the 3rd owner, i just picked it up this week. Its has 43.000 km / 26.700 miles
Out Of Control!!
Joined: Nov 2018
Posts: 11,471
Likes: 5,357
From: San Francisco Bay Area
2019 C63CS
Slipping of the wet clutch with the older 7-speed are fairly well documented. Wear of the clutch, old fluid, low fluid etc. can all have an impact. When was the transmission last serviced? Any idea how often the previews owners used Race Start?
Having said that, even though mine is a FL with the new 9-speed, I never move the car until the rpms have settled.
Having said that, even though mine is a FL with the new 9-speed, I never move the car until the rpms have settled.
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From: Keep it simple - keep it OEM
AMG C63s Coupe
Thread Starter
Junior Member
Joined: Dec 2016
Posts: 23
Likes: 2
437 HP
Slipping of the wet clutch with the older 7-speed are fairly well documented. Wear of the clutch, old fluid, low fluid etc. can all have an impact. When was the transmission last serviced? Any idea how often the previews owners used Race Start?
Having said that, even though mine is a FL with the new 9-speed, I never move the car until the rpms have settled.
Having said that, even though mine is a FL with the new 9-speed, I never move the car until the rpms have settled.
I unfortunately dont know how many times Race Start is used since i bought the car from a local shop who got this car as a trade-in for another car.
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437 HP
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Out Of Control!!
Joined: Nov 2018
Posts: 11,471
Likes: 5,357
From: San Francisco Bay Area
2019 C63CS
As far as i remember the transmission never has been serviced. I’ll need to check the service history again once im home. All services are always done on time by Mercedes Dealer, i have all documents. Engine oil got changed recently.
I unfortunately dont know how many times Race Start is used since i bought the car from a local shop who got this car as a trade-in for another car.
I unfortunately dont know how many times Race Start is used since i bought the car from a local shop who got this car as a trade-in for another car.
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Senior Member
Joined: Dec 2025
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From: Keep it simple - keep it OEM
AMG C63s Coupe
Sounds good.
I would go to MB and check car with Xentry.
All we can do here is guess.
I cant beleve but nothing is unpossible says toyota.
Make a double check of service history.
Transmission 3 Years or 50.000 km
Spark plugs 3 Years or 70.000 km
Diff 3 Years or ??.??? km
Miles dont interesting with your low milage.
I dont think the missing transmission oil change is the problem ( but who knows)
i would guess something is worn … maybe the wet clutch but only a guess.
I would go to MB and check car with Xentry.
All we can do here is guess.
Make a double check of service history.
Transmission 3 Years or 50.000 km
Spark plugs 3 Years or 70.000 km
Diff 3 Years or ??.??? km
Miles dont interesting with your low milage.
I dont think the missing transmission oil change is the problem ( but who knows)
i would guess something is worn … maybe the wet clutch but only a guess.
Last edited by C63s_Jack; Mar 27, 2026 at 03:46 PM.
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437 HP
I just got my battery replaced, since the old one was dying, i will check tomorrow if that has helped, even tho i dont know if the battery would have any affect on this issue.
Member
Joined: Oct 2018
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2019 C63S Sedan
Honestly, not really. Its weird, but it changes from day to day. Some days on cold start with slighty cold weather the issue is still there, other days on a cold start with warmer weather the issue isnt there.
I just got my battery replaced, since the old one was dying, i will check tomorrow if that has helped, even tho i dont know if the battery would have any affect on this issue.
I just got my battery replaced, since the old one was dying, i will check tomorrow if that has helped, even tho i dont know if the battery would have any affect on this issue.
You can find this issue discussed in this thread: https://mbworld.org/forums/c63-c63s-...eleration.html
If it's the same thing, it's your wet clutch that needs replacing
My issue is similar to yours, on start up it requires some throttle for the car to actually start moving. It started out just being a little bit of throttle every once in a while - progressed to every time on start up r requiring a lot of throttle and having a huge thunk to get into gear.
Don't want to scare you, but after what I've been through I would not sit on this issue. I'd go get it addressed as soon as you can.
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From: Keep it simple - keep it OEM
AMG C63s Coupe
How much $$$ ?
Next question is # number history.
On PFL was this a common topic.
FL not so - maybe if you use race start often or abuse car with donuts burnout stage 1-3 etc.
Next question is # number history.
On PFL was this a common topic.
FL not so - maybe if you use race start often or abuse car with donuts burnout stage 1-3 etc.
Last edited by C63s_Jack; Apr 7, 2026 at 02:18 AM.
Member
Joined: Oct 2018
Posts: 107
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2019 C63S Sedan
I don't race start, nor abuse it, nor is it tuned. Think it's a combination of luck of the draw and the ****ty tropical weather taking it's toll on the car
Senior Member
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From: Keep it simple - keep it OEM
AMG C63s Coupe
M177 always sweating.
This wet-clutch is realy expensive in your country.
Transmission out & in + replace Wet Clutch untit - i do not think that this is a realy big job. i have seen YT video.
What you are doing now ?
