What is the reason for the severe jerking during rapid acceleration of the Changan CS75?

[DiPatrick]

The reasons for the severe jerking during rapid acceleration of the Changan CS75 are as follows: 1. Carbon buildup in the throttle: Over time, without cleaning the throttle, carbon buildup occurs inside, leading to insufficient air intake and increased engine vibration. 2. Aging spark plugs: As the vehicle ages, the ignition coils and spark plugs also gradually age, resulting in incomplete ignition and insufficient combustion, which causes the jerking sensation. Regularly checking the condition of the spark plugs can resolve the jerking during acceleration. 3. Fuel supply issues: Another common cause of acceleration jerking is fuel supply problems, such as clogged fuel lines or insufficient fuel pressure. Insufficient fuel injection is mainly due to faulty fuel injectors, which could be caused by excessive carbon buildup or mechanical failure, requiring individual inspection.

[MacZane]

I've driven several similar cars, and the most common cause of sudden acceleration hesitation is the transmission reacting sluggishly or slipping during gear shifts. When the automatic transmission fluid ages or becomes dirty, gear shifts can become jerky, making the car feel like it's lurching. Additionally, if the spark plugs or ignition coils are faulty, causing irregular ignition, the air-fuel mixture burns unevenly during sudden acceleration, leading to similar issues. A clogged fuel system is another factor—for example, if the fuel injectors are blocked by carbon deposits, fuel can't spray properly, causing unstable engine output and resulting in hesitation. Another possibility is an incompatible ECU program setting, where the engine and transmission controls are out of sync, leading to chaos during acceleration. I believe regularly changing the transmission fluid and inspecting ignition components is crucial—don't wait until a major overhaul to regret it.

[Esther]

My Changan CS75 used to jerk badly during sudden acceleration, and after inspection, it turned out the torque converter in the transmission was worn out, causing poor power delivery. Insufficient fuel supply from the fuel pump is also common—when fuel pressure drops, the engine struggles. Additionally, dirty sensors like the mass airflow sensor can cause the ECU to miscalculate air intake, leading to jerking during acceleration. If the clutch disc is worn out, manual transmission cars can also experience this issue. I suggest trying new spark plugs first—it's a low-cost fix that often resolves major issues. Regular maintenance of the fuel injection system and carbon deposit cleaning can help prevent this annoying jerking.

[WestonRose]

As a beginner, I feel that when the car jerks during sudden acceleration, it might be due to old spark plugs or slow transmission response; a clogged fuel filter can also cause this by restricting fuel flow. It's recommended to have it checked at a professional shop rather than trying to fix it yourself.

[VanCecilia]

I believe improper ECU tuning can lead to inconsistent power delivery during rapid acceleration, resulting in poor communication between the transmission and engine. Coupled with failed oxygen sensors or throttle position sensors, the ECU loses precise control, causing jerky movements. Additionally, worn universal joints in the drive shaft may induce vibrations, making acceleration uneven. Regular inspection of these sensors and carbon deposit cleaning can improve responsiveness and prevent sudden issues from affecting driving pleasure.

[DeHeidi]

Hesitation during sudden acceleration is extremely dangerous, as abrupt deceleration may cause rear-end collisions, most commonly due to transmission failure or clutch malfunction. Aging ignition system components like spark plugs can cause engine shuddering, while unstable fuel pump pressure exacerbates the issue. ECU signal delay is another major factor, where the control unit responds too slowly. I always remind myself to change oil and filters regularly as preventive maintenance; if hesitation occurs, immediately shut off the engine to diagnose the cause—never gamble with safety.