What Causes the Gearbox Noise and Jerking in Emgrand GS?
1 Answers
Reasons for gearbox noise and jerking in Emgrand GS: damaged solenoid valve, burnt steel plates and friction plates, and failure to replace transmission fluid regularly. Damaged Solenoid Valve: If the oil pressure solenoid valve is damaged, it can cause the oil pressure to be too low or too high, resulting in a sense of impact or lag when the clutch and brake engage. Similarly, if the shift solenoid valve gets stuck, the effect is more direct and noticeable. It prevents the clutch from quickly disengaging when it should or engaging when it should, leading to power interruption and causing the driver to feel jerking. Burnt Steel Plates and Friction Plates: If the gear shifts from 1st to 2nd and 2nd to 3rd are normal, and other gears also function properly, but there is jerking specifically when shifting from 3rd to 4th, the cause of the issue is quite clear. It is likely due to slippage in the clutch or brake responsible for 4th gear. Of course, solenoid valve failure should first be ruled out, as the solenoid valve can be easily measured and inspected after removing the oil pan. Burnt clutch plates not only cause jerking during gear shifts but also lead to a lack of power in the vehicle. The debris from the worn friction plates can further contaminate the transmission fluid, worsening the condition. Failure to Replace Transmission Fluid Regularly: If the automatic transmission is not maintained for a long time, the performance indicators of the transmission fluid, such as lubricity, viscosity, and thermal stability, will significantly decline. Particularly, the temperature of the automatic transmission fluid can rise if the radiator is too dirty to dissipate heat effectively. When the computer detects high temperatures, it will enter an emergency operation mode, forcing an upshift (locking the gear and driving in a specific gear). This can lead to situations where the vehicle does not accelerate despite pressing the throttle, experiences dragging sensations, or jerking. When the oil temperature exceeds 135°C, it can cause significant damage to components like the friction plates and clutch plates.
