A very strange jerking problem.

solin · 02-27-2022, 10:26 PM

Hi, I have had a problem with the car for a while. I feel a jerk when accelerating the car. Only in first gear and slightly above 2,000 rpm. Just one jerk as if it were a thump. When I start more gently it does not occur. Interestingly, jerking occurs only in comfort and eco pro modes. When I switch to the sports gearbox in these modes, there is also no jerking. It does not occur when I have the sport and sport+ mode with or without a sports gearbox on.

What could it be?
Has anyone had a similar problem?

2016 428i xDrive N26
Thanks!

djacinto · 02-27-2022, 10:37 PM

Quote:

Originally Posted by solin

Hi, I have had a problem with the car for a while. I feel a jerk when accelerating the car. Only in first gear and slightly above 2,000 rpm. Just one jerk as if it were a thump. When I start more gently it does not occur. Interestingly, jerking occurs only in comfort and eco pro modes. When I switch to the sports gearbox in these modes, there is also no jerking. It does not occur when I have the sport and sport+ mode with or without a sports gearbox on.

What could it be?
Has anyone had a similar problem?

2016 428i xDrive N26
Thanks!

Is this at warm up or after the car's been driving for a while?

As far as I know the first gear shift is usually harder than the others but when i flushed my fluids it became noticeably smoother.

But even at warm up, first gear will be a little clunky while the fluid warms up

Solidjake · 02-28-2022, 09:26 AM

What is your mileage? +1 on changing trans/diff fluids (regardless if they are not the reason for the jerking, it's critical to keep those components working correctly and for a longer period of time)

solin · 02-28-2022, 09:55 PM

Mileage 50,000 miles. I changed the gearbox fluid in October. This seems to happen after warming up. But only above 2000 rpm in combination with eco and comfort mode. Nothing happens when the car is gently moved away. Nothing happens in sport and spotr + mode, regardless of the rpm. Nothing happens when I have my transmission shifted to sport, in any mode.

claytonap1 · 03-03-2022, 03:05 PM

We have the same bucking issue w/our 340i. It happens to me in any gear, any sport mode (only in rpm range of 1800-2300). Will be replacing the VANOS actuators to get it fixed.

solin · 03-03-2022, 10:52 PM

I don't know, maybe. I have this problem only in first gear slightly above 2,000 rpm in the comfort and eco mode and after switching the gearbox to the sport mode it disappears.

eluded · 03-04-2022, 03:21 AM

Mine does that sometimes and when I push in the clutch it stops.

02-27-2022, 10:26 PM	#1
solin New Member 0 Rep 18 Posts Drives: BMW 428i xDrive Join Date: Jan 2021 Location: Chicago iTrader: (0)	A very strange jerking problem. Hi, I have had a problem with the car for a while. I feel a jerk when accelerating the car. Only in first gear and slightly above 2,000 rpm. Just one jerk as if it were a thump. When I start more gently it does not occur. Interestingly, jerking occurs only in comfort and eco pro modes. When I switch to the sports gearbox in these modes, there is also no jerking. It does not occur when I have the sport and sport+ mode with or without a sports gearbox on. What could it be? Has anyone had a similar problem? 2016 428i xDrive N26 Thanks!
	Appreciate 0 Tweet Quote

02-28-2022, 09:26 AM	#3
Solidjake ¯\_(ツ)_/¯ 945 Rep 1,762 Posts Drives: '13 328i Msport 6MT Join Date: Jun 2009 Location: NYC/SNJ iTrader: (2)	What is your mileage? +1 on changing trans/diff fluids (regardless if they are not the reason for the jerking, it's critical to keep those components working correctly and for a longer period of time) __________________ Tensioner/belt DIY \| Side skirt extension DIY Apex SM-10/DWS06+ \| 400m/X-ice Xi3 \| Injen Exhaust \| Stoptech SS Lines \| 335 Front Brakes Hawk HPS 5.0 \| RBF600 \| ER Charge Pipes \| Wagner Evo Comp 2 FMIC
	Appreciate 0 Quote

02-28-2022, 09:55 PM	#4
solin New Member 0 Rep 18 Posts Drives: BMW 428i xDrive Join Date: Jan 2021 Location: Chicago iTrader: (0)	Mileage 50,000 miles. I changed the gearbox fluid in October. This seems to happen after warming up. But only above 2000 rpm in combination with eco and comfort mode. Nothing happens when the car is gently moved away. Nothing happens in sport and spotr + mode, regardless of the rpm. Nothing happens when I have my transmission shifted to sport, in any mode.
	Appreciate 0 Quote

03-03-2022, 03:05 PM	#5
claytonap1 Private 79 Rep 72 Posts Drives: 2019 x3 m40i, 2017 340i Join Date: Jan 2020 Location: oxnard iTrader: (0)	We have the same bucking issue w/our 340i. It happens to me in any gear, any sport mode (only in rpm range of 1800-2300). Will be replacing the VANOS actuators to get it fixed.
	Appreciate 0 Quote

03-03-2022, 10:52 PM	#6
solin New Member 0 Rep 18 Posts Drives: BMW 428i xDrive Join Date: Jan 2021 Location: Chicago iTrader: (0)	I don't know, maybe. I have this problem only in first gear slightly above 2,000 rpm in the comfort and eco mode and after switching the gearbox to the sport mode it disappears.
	Appreciate 0 Quote

03-04-2022, 03:21 AM	#7
eluded 2JZ-GTE 3043 Rep 3,996 Posts Drives: 340 6MT, 50e, others Join Date: Nov 2015 Location: Sofia iTrader: (0)	Mine does that sometimes and when I push in the clutch it stops. __________________ A man who views the world the same at 50 as he did at 20 has wasted 30 years of his life.
	Appreciate 0 Quote