What Causes Jerking When Starting an Automatic Transmission Car?

[MacJuniper]

The reasons for jerking when starting an automatic transmission car are as follows: 1. Internal clutch pressure leakage in the transmission: Check for clutch damage and repair promptly. 2. Blocked or unsmooth transmission oil passages: Wear in the oil passage plate, long-term lack of transmission fluid replacement, reduced lubrication effectiveness, excessively dirty transmission filter leading to poor filtration, allowing wear particles to enter the valve body. 3. Insufficient transmission fluid level: Verify whether the transmission fluid has been filled to the specified level. For vehicles with a transmission dipstick, check whether the dipstick reading is within the specified range when the engine is running. 4. Solenoid valve damage: Sludge in the transmission fluid circulating within the transmission can block oil passages in the valve body, causing jerking issues. Prolonged operation under these conditions may lead to transmission overheating, impact, slippage, and other related problems.

[Stacy]

There are various reasons for jerking sensations when starting an automatic transmission car, and I have experienced this myself. It could often be due to transmission issues, such as worn clutch plates inside or a faulty torque converter, leading to poor power transfer and jerky starts. If the transmission fluid hasn't been changed for too long, becoming thick or dirty, it can also increase resistance. Another common cause is engine-related problems, such as an aging ignition system or excessive carbon buildup on spark plugs, causing unstable power output. Sometimes, faulty sensors, like inaccurate speed or throttle position sensor signals, can lead to imprecise computer control and result in jerking. I recommend starting with the basics—check the fluid condition and engine performance. If the issue persists, visit a professional repair shop promptly to avoid safety risks during long-distance driving. Ignoring it for too long may damage more components, so don’t delay.

[AdrianaDella]

The jerky sensation during automatic transmission starts can be quite frustrating. Based on my years of driving experience, the most common cause is an abnormality in the transmission control system, such as delays or damage in the shift module or torque converter solenoid valve, which can lead to a disconnect in power delivery. It may also be caused by engine speed fluctuations, like insufficient fuel supply or throttle carbon buildup, resulting in unsteady acceleration during the initial start. Additionally, uneven tire pressure or driveshaft issues can exacerbate this sensation. If aftermarket parts are installed, such as oversized tires or excessive load, system mismatches can easily cause problems. In such cases, promptly visiting a reliable garage for inspection and replacing sensors or cleaning carbon deposits can resolve the issue. Regular maintenance, including oil changes and periodic servicing, can significantly reduce the risk.

[Rogers]

I often experience jerking when starting the car, which might indicate the torque converter in the transmission needs fresh fluid. Sometimes it's caused by worn spark plugs leading to uneven power output, making the car lurch. Do some basic checks, like listening for steady engine sound at idle – any noise could signal ignition issues. Also, inspect tires and suspension to ensure no extra resistance. If the jerking is severe, don't wait for it to worsen; have a professional mechanic take a look.

[MaverickLynn]

Starting with a jerk really affects the driving mood, and I think it's mostly caused by transmission system failures. For example, torque converter clutch wear or misjudgment by the control computer, slow computer response, or inaccurate signals. A dirty engine throttle or faulty sensors could also cause this. When driving normally, pay attention to stepping lightly on the accelerator when starting, keep it steady, and avoid sudden acceleration to reduce stress. Also, check if the vehicle load is balanced, as too many items can increase the system burden. Timely repairs can avoid more serious faults later and improve driving safety.