What Causes the Car Body to Shake When Starting in First Gear?
2 Answers
The reason for the car body shaking when starting in first gear is insufficient engine power. When the engine power cannot keep up during startup, the car may shake, or if there is looseness in the connection between the transmission and the chassis, a shaking sensation may also occur during startup. The engine is not only applicable as a power generation device but can also refer to the entire machine including the power device (such as gasoline engines, aircraft engines). The transmission, also known as the gearbox, is an automotive component used to change the speed and torque from the engine and can fix or change the transmission ratio of the output shaft and input shaft in steps. The transmission consists of a gear transmission mechanism and a control mechanism, with some cars also having a power output mechanism. It can be divided into stepped, continuously variable, and integrated transmissions, with functions such as enabling reverse driving, interrupting power transmission, and changing transmission ratios.
I often encounter similar issues where the car body shakes when starting in first gear, mainly due to clutch problems. If the clutch disc is worn or slipping, the power transmission becomes uneven, and the engine's force cannot smoothly transfer to the wheels, causing the car body to shake. Another common reason is aging of the ignition system, such as carbon buildup on spark plugs or faulty ignition coils, leading to unstable engine operation and increased shaking during startup. Additionally, deformation or damage to the engine mounts, which fail to absorb vibrations, can also cause shaking. There's also a connection to driving technique—if the throttle and clutch aren't coordinated properly, such as pressing the throttle too abruptly or releasing the clutch too quickly, the power connection becomes rough, resulting in shaking. It's advisable to inspect these components early and replace them if worn, as prolonged neglect can affect power efficiency and even damage the transmission. When driving, pay attention to smooth starts and practice coordinating the clutch and throttle to minimize this issue. Regular maintenance checks on the clutch system and ignition coils are key to prevention.
