What Causes Severe Vibration During Car Acceleration?
3 Answers
The main reasons for severe vibration during car acceleration are: 1. First, check whether the left and right half-shafts are bent. 2. Secondly, disassemble and inspect the inner walls of the left and right inner CV joints for wear and the presence of pits. In most cases, this is caused by damage to the inner CV joint. Additional Information: 1. Most modern cars have front-mounted engines and front-wheel drive, and their inner CV joints are often telescopic to accommodate changes in the relative positions of the transmission drive terminal and the drive wheels during vehicle movement. The inner walls of the inner CV joints, which frequently come into contact with the outer shells of the needle bearings—i.e., the torque transmission areas—often develop pits. 2. During rapid acceleration, the engine and transmission assembly undergoes slight lateral tilting, which shifts the point of force application. Since there is a certain angle between the axial direction of the half-shaft and the inner CV joint, this point of force application continuously moves back and forth along the axial direction as the CV joint rotates. The force generated by this movement pushes the car body alternately to the left and right, resulting in the vibration during acceleration. The solution is to replace the damaged inner CV joint or half-shaft.
I've encountered this issue of severe shaking during car acceleration quite often, and the key culprit is likely the ignition system. Problems with spark plugs or ignition coils are the most common, as they are responsible for ignition - if one fails, it can easily cause unstable engine operation. Fuel supply can also be problematic, such as clogged fuel injectors or insufficient fuel pump pressure leading to uneven fuel delivery. Additionally, aging and wear of engine mounts, where the rubber damping fails, can amplify vibrations transmitted to the car body. The drivetrain can also be a factor, with issues like clutch slippage or dirty transmission fluid potentially causing trouble. I usually recommend first checking the condition of spark plugs and air filters yourself - simple maintenance can save a lot of hassle. If the problem persists, it's best to consult a professional mechanic promptly. Prolonged shaking can damage the suspension or even cause accidents, so regular maintenance is crucial for prevention.
My old car shook like an earthquake when accelerating during the last countryside trip, and I initially thought it was due to uneven roads. After analysis, I realized the ignition system was the key issue—excessive spark plug gaps or failing coils can cause incomplete combustion. Fuel-related problems like clogged filters affect injection, and an engine running lean will naturally shake. Don’t overlook mechanical components either; worn engine mount rubber loses its damping effect, turning minor vibrations into major issues. Once, my friend’s car had unbalanced tires as the culprit—warped rims caused instability at high speeds. Addressing these promptly can prevent bigger losses—for example, replacing mounts is cheaper than engine repairs. Pay slight attention to vibration frequency before each drive, and don’t wait until high-speed loss of control occurs.
