jerking when pressing on accelerate pedal
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AMG GTS, Audi Q8 Lumma, Mini Cooper JCW
jerking when pressing on accelerate pedal
Hi Guys,
Need some opinion, when i accelerate the car jerks sometimes on all modes. there is no warning lights and not sure this is normal for an AMG cars. Anybody have this issue?
Need some opinion, when i accelerate the car jerks sometimes on all modes. there is no warning lights and not sure this is normal for an AMG cars. Anybody have this issue?
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E55, 380SL, GLA 250 Sport, AMG GTS
Have the transmission checked by your dealer. The warranty on those extended to 8 years.
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2019 C63CS
Jerks under what conditions? Have you driven cars with a dual clutch transmission before, or is your experience mostly with torque converter automatics? A dual clutch transmission will occasionally jerk if you catch it in a bad moment when the clutch is disengaged and it has to quickly reengage. For example a common scenario where that happens is if you are slowing down to a stop, but then last minute decide to accelerate again.
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AMG GTS, Audi Q8 Lumma, Mini Cooper JCW
Jerks under what conditions? Have you driven cars with a dual clutch transmission before, or is your experience mostly with torque converter automatics? A dual clutch transmission will occasionally jerk if you catch it in a bad moment when the clutch is disengaged and it has to quickly reengage. For example a common scenario where that happens is if you are slowing down to a stop, but then last minute decide to accelerate again.
tks for the info. its quite a relief knowing its not a major issue.
Out Of Control!!
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2019 C63CS
Yep, it helps to understand that you have a computer controlled clutch that needs to engage and disengage and you can smooth it out with proper throttle input. If you have also never driven a car with a manual transmission, than much of this will be new territory to you. Learn to roll into the throttle and feel what the clutch is doing. If you are slowing down and suddenly accelerate you wanna do that with smooth throttle inputs. If you'll drive it like a regular automatic, it will keep jerking. BTW, these transmissions are most enjoyable if driven in manual mode and controlling the gears yourself, so you don't get into situations where the transmission is tripping over itself, because it doesn't quite know what gear it needs to be in. Dual clutch transmissions only shift fast and smooth if the next gear has already been correctly preselected on the second shaft and the clutches just need to trade places. Anything else will result in power interruption and jerking.
Last edited by superswiss; Dec 11, 2022 at 09:38 PM.
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AMG GTS, Audi Q8 Lumma, Mini Cooper JCW
[QUOTE=superswiss;8684133]Yep, it helps to understand that you have a computer controlled clutch that needs to engage and disengage and you can smooth it out with proper throttle input. If you have also never driven a car with a manual transmission, than much of this will be new territory to you. Learn to roll into the throttle and feel what the clutch is doing. If you are slowing down and suddenly accelerate you wanna do that with smooth throttle inputs. If you'll drive it like a regular automatic, it will keep jerking. BTW, these transmissions are most enjoyable if driven in manual mode and controlling the gears yourself, so you don't get into situations where the transmission is tripping over itself, because it doesn't quite know what gear it needs to be in. Dual clutch transmissions only shift fast and smooth if the next gear has already been correctly preselected on the second shaft and the clutches just need to trade places. Anything else will result in power interruption and jerking.[/QUOTE
You are right again. Mostly happens when im not using the pedal shift. Your advice really make sense. Thank you so much for the amazing info superswiss! These really helps.
You are right again. Mostly happens when im not using the pedal shift. Your advice really make sense. Thank you so much for the amazing info superswiss! These really helps.
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‘24 BMW iX M60
[QUOTE=torquecraz;8684138]
Pretty common for the DCT to ‘jerk’ when it changes from 2nd to 1st at very low speeds when coming to a stop. Go ahead and pull the left paddle at around 10 mph so that the gearbox changes into first when the engine is pulling slightly higher revs, and it will smooth out the change greatly. You can still leave the car in ‘D’ or Auto mode as it will revert back to Auto after a few seconds even when you initiate a solitary manual change via the paddles. I did this pretty much all the time and it became second nature.
Yep, it helps to understand that you have a computer controlled clutch that needs to engage and disengage and you can smooth it out with proper throttle input. If you have also never driven a car with a manual transmission, than much of this will be new territory to you. Learn to roll into the throttle and feel what the clutch is doing. If you are slowing down and suddenly accelerate you wanna do that with smooth throttle inputs. If you'll drive it like a regular automatic, it will keep jerking. BTW, these transmissions are most enjoyable if driven in manual mode and controlling the gears yourself, so you don't get into situations where the transmission is tripping over itself, because it doesn't quite know what gear it needs to be in. Dual clutch transmissions only shift fast and smooth if the next gear has already been correctly preselected on the second shaft and the clutches just need to trade places. Anything else will result in power interruption and jerking.[/QUOTE
You are right again. Mostly happens when im not using the pedal shift. Your advice really make sense. Thank you so much for the amazing info superswiss! These really helps.
You are right again. Mostly happens when im not using the pedal shift. Your advice really make sense. Thank you so much for the amazing info superswiss! These really helps.
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2019 C63CS
Not if it has properly adapted. I've driven a number of cars with automated clutches, including the GT S, GT R and GT BS. None of them do this once properly broken in and adapted. The transmission should stay in 2nd gear and declutch and only drop to 1st gear once the car is stationary with the clutch disengaged. FWIW, the 9-speed MCT in my '19 C63S did this at first and downshifted to 1st gear while I was still rolling, jerking every time, but it stopped doing it once I had done a bunch of around town and city driving and it had the time and mileage to adapt. It now also stays in 2nd gear until I come to a complete stop and then drops into 1st. For brief, rolling stops it stays in 2nd and continues on in 2nd gear. I can even hold it in 2nd when I'm in manual mode. For me it took nearly 8000 miles before it adapted properly, but that was largely because I drove the first 6000 miles around Europe with mostly high speed German Autobahn driving and very little city driving. Once the car arrived in the USA and I did my more typical mixed driving, it quickly adapted.
Last edited by superswiss; Dec 12, 2022 at 02:15 PM.
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Not if it has properly adapted. I've driven a number of cars with automated clutches, including the GT S, GT R and GT BS. None of them do this once properly broken in and adapted. The transmission should stay in 2nd gear and declutch and only engage 1st gear once the car is stationary with the clutch disengaged. FWIW, the 9-speed MCT in my '19 C63S did this at first and downshifted to 1st gear while I was still rolling, but it stopped doing it once I had done a bunch of around town and city driving and it had the time and mileage to adapt. It now also stays in 2nd gear until I come to a complete stop and then drops into 1st. For brief, rolling stops it stays in 2nd and continues on in 2nd gear. I can even hold it in 2nd when I'm in manual mode. For me it took nearly 8000 miles before it adapted properly, but that was largely because I drove the first 6000 miles around Europe with mostly high speed German Autobahn driving and very little city driving. Once the car arrived in the USA and I did my more typical driving in quickly adapted.
Out Of Control!!
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From: San Francisco Bay Area
2019 C63CS
My experience was with my '18 GTR that in 5,000 miles and over two years of mixed street and track driving would almost always slightly 'jerk' when changing down and coming to a complete halt at a stop light. It never bothered me much at all, but I could see how it might a 'newbie' to the DCT world of gearboxes, which I've been driving for decades, and before that single clutch automated gearboxes; (think SMG II and R Tronic). Since I could mitigate the slight 'jerkiness' of when the car changed into 1st gear, and yes, that's what it was doing, by enabling a manual override of the TCU, that's what I generally did. Plus I liked the increased exhaust noise tbh! lol
Last edited by superswiss; Dec 12, 2022 at 02:30 PM.
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In my experience at 5000 miles every performance car I've owned still wasn't fully broken in. All my performance cars needed about 8-10k miles before they opened up and everything came together. That's been fairly consistent for me. At about 8000 miles they start opening and properly loosen up. That's why I generally hang on to mine for several years and drive them into the mid to high 5 digit mileage. Like a good wine, they get better with age.
You may be correct, but tbh after an OEM break-in, winding a car out on a road course multiple times is going to "open it up" pdq.
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2019 C63CS
You'd think so, but that has not been my experience. I wind out all my cars. With the last two I did European Delivery, driving thousands of miles at triple digit speeds on the German Autobahn and taking it to the Nürburgring, then frequent canyon carving back home in the USA on remote roads with nobody on it. They still didn't fully open up until around the same mileage. So much is software today and the manufactures don't really disclose what exactly happens in the ECU over time and mileage. On top of that I had software updates to the ECU and TCU for both cars over time that further improved how it drove. My C63S actually had incorrect coding for the AMG Drive Unit from the factory, which was resolved via service campaigns about a year into my ownership. It made a noticeable difference. Then just recently I had it in for service for a misfire at now just shy of 30k miles and they installed another update, which so far fixed the misfire, but as a side effect also improved drivability. The transmission further improved as well. It drives better now than it ever did during the last three years. I wish they were more proactive with available software updates and not only install them when the customer has a complaint.
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[QUOTE=thebishman;8684402]
Pretty common for the DCT to ‘jerk’ when it changes from 2nd to 1st at very low speeds when coming to a stop. Go ahead and pull the left paddle at around 10 mph so that the gearbox changes into first when the engine is pulling slightly higher revs, and it will smooth out the change greatly. You can still leave the car in ‘D’ or Auto mode as it will revert back to Auto after a few seconds even when you initiate a solitary manual change via the paddles. I did this pretty much all the time and it became second nature.
You know what, i tried pull the left paddle at around 10 mph and it was smooth. no jeking. Thank you thebishman
Pretty common for the DCT to ‘jerk’ when it changes from 2nd to 1st at very low speeds when coming to a stop. Go ahead and pull the left paddle at around 10 mph so that the gearbox changes into first when the engine is pulling slightly higher revs, and it will smooth out the change greatly. You can still leave the car in ‘D’ or Auto mode as it will revert back to Auto after a few seconds even when you initiate a solitary manual change via the paddles. I did this pretty much all the time and it became second nature.
