What Causes the Jerking Sensation When Releasing the Accelerator in a Car?

[McBentley]

There are several reasons why a car may jerk when releasing the accelerator, including transmission abnormalities, fuel supply issues, and a faulty clutch switch. The details are as follows: Transmission abnormalities: Persistent dirt and impurities inside the transmission can prevent effective regulation of oil pressure, leading to jerking, impact, or slippage. The solution is to first check the transmission fluid to see if it is low or has deteriorated. Fuel supply issues: Carbon buildup or minor blockages in the fuel injectors can cause inconsistent fuel delivery among the four injectors, leading to irregular fuel supply and resulting in a jerking sensation. The solution is to inspect the fuel injectors for blockages and clean them promptly. Faulty clutch switch: The clutch switch, located beneath the clutch pedal, works with the ECU to improve gear-shifting quality. For example, during upshifts, the ECU can moderately adjust the throttle and ignition to ensure smoother power transitions and seamless gear changes. When releasing the accelerator while driving, the engine does not immediately reduce fuel injection but does so gradually, allowing the engine speed to decrease smoothly and avoiding excessive engine braking, which can cause jerking. If the clutch switch malfunctions, these control functions fail, making jerking more likely to occur.