What is the problem when there is a jerking sensation when stepping on the accelerator?
2 Answers
The reason for the jerking sensation when stepping on the accelerator is due to a clogged fuel system. Cleaning the fuel system, fuel injectors, fuel lines, and fuel pipes is necessary. For automatic transmission vehicles, jerking during startup is a normal occurrence. If you want to accelerate quickly while driving, you need to press the accelerator deeply. At this time, the automatic transmission will automatically downshift to increase the engine speed. When the speed reaches a certain level, it will upshift. After upshifting, because the speed will drop significantly, a relatively obvious jerking sensation will occur. Automatic start-stop systems combined with dual-clutch transmissions inherently have this issue. If the ignition is abnormal, replace the spark plugs or ignition coils. When an automatic transmission experiences jerking, in many cases, it is not due to internal valve body damage but rather stubborn dirt and impurities inside, especially when dirt and impurities accumulate inside the valve body, causing blockages. This prevents effective regulation of oil pressure, leading to jerking, impact, and slippage issues. Methods to eliminate jerking when stepping on the accelerator: Check the throttle valve, check the fuel injectors, check the air intake, check the spark plugs, check the ignition coils, etc.
Last time I drove my car, I also experienced throttle hesitation issues, and it felt jerky while driving. First, I checked the spark plugs and found severe carbon buildup. After replacing them, it improved a lot. Later, I discovered the fuel injectors were also clogged, and cleaning them made it much smoother. Not changing the transmission fluid for too long can also cause this, especially feeling a tug during sudden acceleration. Insufficient fuel supply pressure from the fuel pump is another common cause, which can be tested with a pressure gauge. If it's a carbon buildup issue, a dirty throttle body has the biggest impact, and cleaning it once can significantly improve performance. A car is like a person—you shouldn’t delay maintenance. I check these wear-prone parts every month. By the way, a dirty mass airflow sensor causing an error can also produce similar symptoms, and cleaning it should help.
