Why does the vehicle experience jitter and jerking?

[OJace]

Vehicle jitter and jerking are caused by faulty spark plugs. Below are some relevant driving precautions:1. Strictly adhere to traffic regulations: According to traffic department statistics, over 80% of traffic accidents are caused by violations by one party. Traffic regulations are the lessons and experiences gained by 'predecessors'. Complying with traffic rules is the most important aspect among driving precautions for beginners, as it can minimize the probability of traffic accidents.2. Properly control the steering wheel while driving: The five most fundamental principles to master when driving are starting, stopping, turning, shifting gears, and braking.

[DelHolden]

When a vehicle experiences jerking, the most common cause is an imbalanced engine operation. The last time I encountered this issue, it was due to a misfire caused by aged spark plugs, as if one of the engine's cylinders was slacking off and not working. Additionally, leaking ignition coils can prevent the spark plugs from firing, and a dirty mass airflow sensor leading to incorrect air-fuel mixture ratios is also a common problem. If the shaking is particularly noticeable at idle, you can check whether the engine mounts are aged or broken—if this rubber component fails, engine vibrations will directly transmit into the cabin. Carbon buildup in the throttle body causing it to stick and not open or close smoothly can also result in sudden surges when accelerating. It's recommended to first read the trouble codes, as this will provide a clearer direction for troubleshooting.

[WalkerLee]

Gearbox issues causing jerking significantly affect the driving experience. In automatic transmission vehicles, when the torque converter's lock-up clutch wears out, noticeable jerks occur during gear shifts. Dual-clutch transmissions may exhibit similar jerking to manual transmissions when the clutch plates overheat during low-speed follow-up driving due to partial engagement. Remember to check if the transmission fluid has deteriorated and turned black, as insufficient oil pressure can lead to mistimed gear shifts. For manual transmissions, it's often due to excessive wear of the clutch three-piece set, causing the car to jerk when releasing the clutch. The most typical case I've handled involves worn-out CV joints, producing clicking sounds and severe vibrations during acceleration while turning.

[LaAdriel]

Abnormalities in the fuel system are particularly prone to causing acceleration hesitation. Clogged fuel injectors can lead to uneven fuel supply across the four cylinders, while insufficient pressure from the high-pressure fuel pump results in obvious fuel starvation during sudden acceleration. A fuel filter that hasn't been replaced for too long can cause poor fuel delivery, and an aging fuel pump often leads to erratic RPM fluctuations. It's recommended to observe the exhaust emissions during cold starts; if there's a strong gasoline smell or black smoke, it usually indicates misfiring due to incomplete combustion. Running a tank of fuel with additives on the highway can sometimes alleviate the issue.

[KingstonRose]

Vibration caused by worn chassis components exhibits a clear speed correlation. When the vehicle reaches a specific speed range and the steering wheel starts shaking, there's an 80% chance the wheel hub is deformed and requires dynamic balancing. If you hear a clunking sound when going over speed bumps accompanied by left-right body sway, check if the lower control arm bushings are cracked. Excessive play in the steering ball joints will make the front wheels' trajectory erratic. The most concealed case I've encountered involved uneven brake discs - light braking made the car body bounce like on a trampoline. Tires worn into sawtooth patterns can also produce rhythmic vibrations around 80 km/h.