What Causes Noticeable Jerking at Speeds Between 55 and 60?
2 Answers
The following are reasons for jerking sensations during vehicle operation: 1. Excessive carbon deposits: Heavy accumulation in the throttle body, fuel injectors, or intake ducts. 2. Poor combustion: Jerking during driving is mostly caused by inefficient fuel combustion within the engine. 3. Generally categorized into jerking caused by engine faults: Transmission gearshift jerking, which could also result from excessive clearance in engine mounts, drive shafts, or suspension systems. 4. Jerking during acceleration due to transmission gearshifts: Most common in AT or dual-clutch models. Slight jerking during gear changes is unavoidable, but becoming familiar with the vehicle's shift points and easing off the accelerator slightly in advance can make the jerking sensation less noticeable.
When driving an automatic transmission car, I often notice a jerking sensation at speeds between 55 to 60 kilometers per hour, as if the car is hesitating to shift gears. This is usually because the automatic transmission is switching gears at that speed point. If the transmission fluid is too dirty or insufficient, the gear shifts become less smooth. Sometimes, aging spark plugs can also cause slight engine vibrations, which transmit to the wheels and feel like jerking. My car had this issue before, and changing the transmission fluid once improved it significantly. Additionally, if there's a problem with the fuel system, such as clogged fuel injectors, it can cause similar symptoms. It's recommended to regularly check the transmission fluid level and the condition of the spark plugs. Don't overlook small details—safety first.
