What Causes Vibration When Shifting to Reverse Gear in an Automatic Car?
2 Answers
When shifting gears in an automatic car, some vibration is normal because the clutch and differential are engaged, and the engine is generating torque. However, if the vibration is severe, it may be due to the following reasons: 1. Low idle speed; 2. Dirty throttle body; 3. Dirty fuel injectors; 4. Severe engine carbon buildup; 5. Poor spark plug performance. Relevant information about automatic cars is as follows: 1. Automatic cars typically use hydraulic transmission devices to replace the mechanical clutch in manual cars, so there is no clutch pedal. 2. When the engine speed is low, the torque transmitted by the fluid is limited and insufficient to propel the car forward. When the gear lever is placed in the drive position and the brake pedal is released, the transmitted torque increases as the throttle is applied and the engine speed rises, pushing the car forward.
When driving an automatic transmission car, I noticed vibrations when shifting into reverse gear. It's mostly due to loose or aged and cracked engine mounts or transmission supports. These components are designed to withstand high torque during reverse gear engagement. If they can't support the weight of the engine and transmission properly, shaking occurs. Another possibility is old or improperly viscous transmission fluid, or worn drive shaft joints causing rough operation. I've experienced this before - mild vibrations start as tremors, but if they persist and the steering wheel begins shaking severely, you should pull over immediately for inspection. As preventive maintenance, have technicians check these parts regularly during servicing. Don't wait until complete failure occurs, as repairs will be more expensive then.
