What Causes Severe Gearbox Jerking in BYD Vehicles?
1 Answers
Low-speed jerking may be caused by excessive carbon buildup in the throttle body, fuel injectors, or intake manifold; or by substandard fuel quality leading to incomplete combustion; it could also result from faulty spark plugs, ignition coils, or other components causing cylinder misfires. Such issues require inspection and repair at a service center to prevent further safety hazards. Below are relevant explanations: 1. Engine oil passage blockage: If jerking occurs while driving, the engine is undoubtedly involved. The engine's ignition, air intake, and fuel injection jointly determine fuel combustion, which is the power source. If air intake decreases, ignition weakens, or fuel injection reduces, power shortage occurs, resulting in jerking. 2. Jerking during automatic transmission vehicle acceleration is normal: When attempting rapid acceleration, deep throttle application prompts the automatic transmission to downshift, raising engine RPM. Upon upshifting, RPM drops significantly, causing noticeable jerking. 3. Transmission damage: If jerking is more severe than usual, potential transmission damage should be considered, such as persistent contamination inside the transmission, particularly when deposits accumulate in the valve body, obstructing proper oil pressure regulation and causing jerking, impact, or slippage. 4. New vehicle break-in: During the break-in period, slight jerking is normal as neither power output nor component engagement is optimal, and the transmission control module requires continuous oil pressure adjustments through its self-learning mechanism.