What are the reasons for the sluggish acceleration of BYD S6?
3 Answers
The main reasons for the sluggish acceleration of BYD S6 may include incorrect ignition timing, low fuel pressure, air leakage in the intake system, malfunction of the throttle position sensor or mass air flow sensor, poor injector performance, or issues with the EGR system. 1. Troubleshooting: After starting the engine, check if the "Check Engine" warning light turns off; if it does not turn off, inspect the fault code to determine the cause and location of the issue. If the warning light turns off, check the fuel pressure in the supply system, the performance of the injectors, and the quality of the gasoline. Verify if the ignition timing is excessively delayed; if it is, check the knock sensor and the ECU for normal operation. 2. Engine Configuration: The four-speed automatic transmission is paired with a 4G69 2.4L engine from Mitsubishi, with performance parameters of 118kW (160 horsepower)/5800rpm maximum power and 215Nm/3500-4500rpm maximum torque. The 2.0L engine uses the BYD483QB model developed by BYD, with maximum power and torque of 103kW (140 horsepower)/6000rpm and 186Nm/4000-4500rpm, respectively.
Many BYD S6 owners have reported experiencing sluggish acceleration, which typically indicates delayed power output and unresponsive performance during starts or acceleration. The most common causes include a clogged air filter restricting airflow (the engine requires sufficient air for proper fuel combustion), fuel system issues such as carbon buildup in injectors or insufficient fuel supply from the pump (preventing the engine from revving up), and aging spark plugs or faulty ignition coils causing delayed ignition. For troubleshooting, start with simple checks: pop the hood to inspect if the air filter appears darkened—replace if dirty. For suspected fuel issues, try adding a fuel system cleaner. Faulty sensors in the electronic control unit (e.g., throttle position sensor) may also misinterpret acceleration signals. Don’t overlook routine maintenance—monthly inspections of filters and spark plugs prevent many issues. I’ve observed that city driving in heavy traffic accelerates carbon buildup; occasional highway runs or using fuel additives can help. If problems persist, visit a professional shop for diagnostic scans to avoid minor issues escalating into major repairs. Remember, timely action saves fuel and ensures safety.
My BYD S6 also experienced sluggish acceleration recently. When I stepped on the gas pedal, the car felt lazy and lost its kick-down feeling. After analysis, the most likely causes are: a dirty air filter clogging the intake pipe, preventing the engine from getting enough air for proper combustion; or worn-out spark plugs leading to poor ignition. I also noticed that a clogged exhaust system, such as an aging catalytic converter, could cause similar issues, as blocked exhaust gases create backpressure. Additionally, carbon buildup on valves or fuel injectors can cause uneven fuel spray. The inspection steps are simple: first, pop the hood and check the air filter—replace it if it's full of dust; listen for abnormal engine noises, which may indicate spark plug replacement is needed. Reducing short-distance start-stop driving in daily use can prevent carbon buildup. For turbocharged versions, turbo lag might also cause sluggishness at low RPMs. I recommend getting an engine cleaning service every six months to prevent worsening issues. Visiting a 4S shop for an OBD scan can quickly pinpoint the problem. Safety first—don't force it on the road.
