What causes a strong jerking sensation after releasing the accelerator?
3 Answers
The reasons for a strong jerking sensation after releasing the accelerator are: 1. For manual transmission cars, the jerking sensation is often due to driving technique issues. Many beginners fail to shift gears correctly when decelerating or downshifting, leading to gear dragging and causing the car to jerk. 2. For automatic transmission cars, a jerking sensation after releasing the accelerator is likely due to transmission abnormalities. It is advisable to first check if the transmission fluid is low or deteriorated. If no issues are found, it is recommended to visit a professional repair shop or a 4S store for a diagnostic check of the transmission control system. The accelerator, also known as the "throttle" or "air valve," is a control device that regulates the engine's power (thrust). In piston-type aircraft engines, the throttle controls the opening of the carburetor's throttle valve to regulate the cylinder's filling volume, thereby determining the engine's output power.
My old car has been jerking badly when I let off the throttle recently, as if being yanked from behind. Inspection revealed that intermittent ignition caused by aged spark plugs led to unstable engine output. Additionally, the transmission fluid hasn't been changed for too long, and sludge has made the shifting mechanism sticky, causing unsmooth clutch engagement when releasing the throttle. Cracked engine mounts are also an issue, making engine vibrations directly transmitted into the cabin particularly noticeable. I suggest you first read the trouble codes, focusing on the ignition coils and oxygen sensor data stream, while also checking if the rubber in the engine mounts has hardened or cracked. Don't rush to replace the transmission—it's likely these small components causing the trouble.
I can totally relate to the throttle lift-off jerking issue. Last month when cleaning the throttle body, I found carbon deposits as sticky as asphalt coating the shaft, causing delayed throttle response. Clogged fuel injectors are even more troublesome - when releasing the throttle, the sudden fuel supply interruption makes the engine sputter. If your car has a turbo, a faulty blow-off valve can cause sudden boost pressure release, making the whole car lunge forward. The most classic case I handled was a VW owner whose gear shifts felt like rear-end collisions - we eventually traced it to needing a transmission ECU software update. Remember to ask your mechanic to inspect cylinder carbon buildup with a borescope during maintenance.
