Why does the car jerk intermittently?

[VanAlina]

The car jerking intermittently is due to the fact that the car's half-shaft, under long-term torsional fatigue and impact forces, is prone to bending, twisting, breaking, as well as wear or skewing of the spline teeth. This can cause the car to shake rhythmically when accelerating within a certain speed range. Here is additional information: 1. Engine operation issues: For the engine to function properly, it requires sufficient air, adequate gasoline, and a well-functioning ignition system. Any problem in these areas can cause the engine to shake. If there is a leak or blockage in the intake system, the car may experience jerking when accelerating. 2. Precautions: While driving, it is important to shift gears promptly according to road traffic conditions. When road conditions are good and traffic is light, shift to a higher gear to keep the engine operating at its optimal speed.

[DelPaige]

When I was driving before, I noticed the car jerking. Common causes include issues with the ignition system, such as worn-out spark plugs or faulty ignition coils, which can lead to intermittent engine misfires; fuel system problems like clogged fuel injectors or dirty fuel filters, affecting smooth fuel delivery; transmission issues, such as slipping in an automatic transmission or worn clutch in a manual transmission; and intake system problems, such as a malfunctioning mass airflow sensor or vacuum leaks, causing uneven air-fuel mixture. When troubleshooting, start with the basics—check if the spark plugs need replacing or if the fuel quality is good. If the problem persists, take the car to a professional repair shop immediately to avoid compromising driving safety.

[VonJoel]

After years of repairing cars, I've seen many cases of jerking vehicles. Engine issues are usually the main culprit, especially when the electronic control unit misjudges and causes ignition timing disorder. Secondly, insufficient transmission fluid or damaged valve bodies can lead to severe gear shift jerking. Faulty sensors like oxygen sensors may also cause engine shaking. Sometimes, worn universal joints on the driveshaft or unbalanced tires can create this sensation as well. During diagnosis, start by using an OBD scanner to read fault codes for initial problem localization. If necessary, check the cleanliness of fuel injectors or measure cylinder compression pressure. Regular maintenance and timely oil changes are recommended to prevent such issues.

[MaximusAnn]

I remember decades ago when driving classic cars, jerking motions were quite frequent, mostly caused by excessive carbon buildup on spark plugs due to outdated ignition systems or malfunctioning distributors. Insufficient fuel pump pressure or rust-clogged fuel lines could also lead to poor fuel delivery; coupled with sluggish gear shifts in old transmissions, it easily resulted in shaking. Nowadays, such issues are much rarer in new cars, but they can still occur with poor maintenance, such as excessive engine carbon deposits or ECU malfunctions. Always pay attention to engine sounds while driving—unusual noises are warning signs. Early cleaning of the throttle valve and replacing filters can prevent major overhauls.