C250CDI 4Matic 9g tronic shaking when accelerating below 2000 rpm
01-09-2024, 08:51 AM
#1
Newbie
Thread Starter
Join Date: Nov 2018
Location: Belgrade
Posts: 9
Likes: 0
Received 1 Like
on
1 Post
C250 4matic - W205
C250CDI 4Matic 9g tronic shaking when accelerating below 2000 rpm
As it's written in title some summary.
More detailed explanation:
When driving below some speed (50mph 80kmh) there isn't much to say (maybe it's so small that it can not be felt) but no shaking.
If driving above these speeds shaking happens while accelerating. For example car is shaking most when engine rpm is between 1500 and 2000. If above then shaking stops or it's not that big.
And this is while in comfort mode. When in sport or sport+ then gear change is later and it's almost always above 2000rpm.
Exact scenario that happened:
I was driving on a highway in 9th gear, wanted to accelerate but not hard, just pushed a gas pedal a little and then when engine started pulling it started shaking. And as I mentioned between 1.5k and 2k can be felt most.
When it goes over 2k rpm it lowers almost to 0, you can still feel it. Or if you accelerate hard, when gearbox lowers to lower gear or above 2k rpm, same story.
I changed shaft bearing but still same experience.
Did someone of you experienced same thing? How did you fix it?
How can I test front drive shafts? Or smaller driving shaft from gearbox to front differential?
I was taking everything off since I was changing timing chain and refreshing engine with new piston rings and bearings since, oil pump etc, when already taken off why not change it. Engine has 450k km.
Thanks in advance for your answers.
Cheers
More detailed explanation:
When driving below some speed (50mph 80kmh) there isn't much to say (maybe it's so small that it can not be felt) but no shaking.
If driving above these speeds shaking happens while accelerating. For example car is shaking most when engine rpm is between 1500 and 2000. If above then shaking stops or it's not that big.
And this is while in comfort mode. When in sport or sport+ then gear change is later and it's almost always above 2000rpm.
Exact scenario that happened:
I was driving on a highway in 9th gear, wanted to accelerate but not hard, just pushed a gas pedal a little and then when engine started pulling it started shaking. And as I mentioned between 1.5k and 2k can be felt most.
When it goes over 2k rpm it lowers almost to 0, you can still feel it. Or if you accelerate hard, when gearbox lowers to lower gear or above 2k rpm, same story.
I changed shaft bearing but still same experience.
Did someone of you experienced same thing? How did you fix it?
How can I test front drive shafts? Or smaller driving shaft from gearbox to front differential?
I was taking everything off since I was changing timing chain and refreshing engine with new piston rings and bearings since, oil pump etc, when already taken off why not change it. Engine has 450k km.
Thanks in advance for your answers.
Cheers
