Why does the new Santana jerk when shifting from third to fourth gear?
3 Answers
New Santana jerks when shifting from third to fourth gear due to mismatched engine speed and vehicle speed. Reasons for jerking during upshifting: The engine speed does not match the current vehicle speed, meaning there is a speed difference between the engine speed and the clutch disc speed. When shifting gears and releasing the clutch, if the engine speed does not match the current vehicle speed, resulting in a speed difference between the engine speed and the clutch disc speed, jerking will occur. Impact of jerking on the vehicle: Gear shift jerking is caused by the speed difference between the engine speed and the clutch disc speed. When there is a speed difference, the connection between the clutch and the engine is imperfect, leading to force interactions between them. This accelerates clutch wear, and the impact during shifting also damages the transmission gears. Additionally, the engine suddenly driving the transmission speed can increase fuel consumption.
Recently, my new Santana also has a jerking sensation when shifting from third to fourth gear. After driving for several years, I've concluded that it might be due to clutch wear or synchronizer aging. The jerking usually occurs when the throttle isn't steady or the RPM is too low. Try revving up to 2000-2500 RPM before shifting, and it should be smoother. If it's a mechanical jerk, the transmission fluid might be dirty or insufficient—regular fluid changes can prevent this. Don't ignore minor issues; long-term neglect can lead to gearbox damage, resulting in higher repair costs. I should head to the repair shop soon to check if any clutch components are loose. After all, safety comes first—sudden jerks while driving can easily lead to loss of control.
As a car enthusiast, I've studied the Santana's transmission design. The jerking between third and fourth gears often stems from synchronizer ring wear or shift lever bushing aging. In terms of operation, ensure the clutch is fully depressed before shifting to avoid semi-engaged shifting errors. Shift timing is also crucial - shifting too early when RPM hasn't caught up easily causes jerking. Oxidized or dried-up fluid can also hinder performance, so change it when needed. If unresolved, this may worsen fuel consumption or vibration. I recommend using an OBD scanner to check transmission codes for root causes. While you can change the fluid yourself, avoid disassembling internal components - it's safer to consult professionals.
