What Causes Slippage in a Manual-Automatic Transmission?
2 Answers
The causes of slippage in a manual-automatic transmission include low hydraulic fluid level, slippage of the one-way overrunning clutch, and excessively high hydraulic fluid level. Symptoms of the issue: When pressing the accelerator pedal during startup, the engine speed increases rapidly but the vehicle speed rises slowly; during driving, pressing the accelerator pedal to accelerate results in increased engine speed without a corresponding rise in vehicle speed; normal driving on flat roads is possible, but the vehicle lacks power when climbing hills, with the engine running at high RPMs. Solutions: Always use lubricants from reputable brands and ensure the fuel tank maintains a proper fluid level. Regularly inspect the engine and transmission, neutral start switch, overdrive switch, oil pressure, and the condition of the throttle valve linkage and wide-open throttle. If the main oil circuit pressure is normal, simply replace the worn or burnt friction components. If the main oil circuit pressure is abnormal, during the disassembly and repair of the automatic transmission, the oil pump and valve body should be serviced accordingly based on the main oil circuit pressure, and all seals and sealing rings of the automatic transmission should be replaced.
I've seen plenty of cases of slippage in automated manual transmissions, mostly caused by transmission fluid issues. Low fluid levels or contaminated fluid can lead to unstable hydraulic system pressure and poor clutch engagement, naturally resulting in a sensation of power interruption. Sometimes severe wear, such as frequent manual mode shifting, accelerates the aging of clutch plates or torque converters, making slippage more frequent. Sensor failures are also common culprits – if the computer misjudges gear positions or receives incorrect shift signals, the car will keep slipping. I recommend owners first check the fluid level themselves by pulling out the dipstick to see if it's within the normal range, then try replacing the fluid. If that doesn't work, it's best to take it to a professional repair shop for a comprehensive diagnosis. Don't underestimate this issue – prolonged neglect can burn out the entire transmission, leading to not only high repair costs but also dangerous driving conditions. Regular fluid maintenance is key to prevention; generally, changing the fluid every 40,000-50,000 kilometers can significantly reduce such problems.
