2011 C250 jerking
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2011 w204
2011 C250 jerking
Hi guys so I'm driving a c250 1.8 petrol and something strange happened. While my car is cold and im driving like 40 to 50km/h and i let it roll without pressing the gas pedal it starts to jerk while slowing down till i press on stop pedal more and it downshifts, but when the engine reaches about 80c and i do exactly the same thing everything seems fine. My friend had a computer connected and it showed an error, I can't remember exactly which part but he said it's something with steam collection from the petrol ( I'm really not a car guy haha) is it possible that the jerking happens because of that petrol steam collection or i should start worrying about my gearbox ?
All help is appreciated, thank you in advance
)
All help is appreciated, thank you in advance
)
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Joined: Sep 2013
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2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
I’m answering based only on a symptom and not anything else.
I don’t think your car has anything severely wrong. But it could be taking a bit longer to warm up. Before the transmission reaches some preset operating temperature, it holds the gears longer and does not upshift quickly causing the engine and transmission to “bounce” on the very pliable mounts on rapid deceleration. Warm up for the transmission should be 1½ - 2 minutes at most and well before the coolant reaches 80 C. How many miles are on your car? Transmission fluid and filter should be changed at around 90,000 km. Another issue could be a failed thermostat causing the car to run very cold for too long. It needs to reach 40 C quickly. Finally, there could be a collapsed engine mount, but that would cause unpleasant noise and vibration which you do not report.
As a work around, you could let the car run at idle for 2 minutes before driving off. If that works, look to changing the transmission fluid. If not, suspect the thermostat.
A professional scan would be best to identify any recorded performance problems before doing repairs.
I don’t think your car has anything severely wrong. But it could be taking a bit longer to warm up. Before the transmission reaches some preset operating temperature, it holds the gears longer and does not upshift quickly causing the engine and transmission to “bounce” on the very pliable mounts on rapid deceleration. Warm up for the transmission should be 1½ - 2 minutes at most and well before the coolant reaches 80 C. How many miles are on your car? Transmission fluid and filter should be changed at around 90,000 km. Another issue could be a failed thermostat causing the car to run very cold for too long. It needs to reach 40 C quickly. Finally, there could be a collapsed engine mount, but that would cause unpleasant noise and vibration which you do not report.
As a work around, you could let the car run at idle for 2 minutes before driving off. If that works, look to changing the transmission fluid. If not, suspect the thermostat.
A professional scan would be best to identify any recorded performance problems before doing repairs.
