* Driveshaft problems: This is a very common cause. A worn-out U-joint (universal joint) in the driveshaft is a prime suspect. These joints allow for the changing angles of the driveshaft as the wheels turn, and when worn, they cause vibrations that are most noticeable under acceleration. A bent or damaged driveshaft is also possible, though less likely.
* Transmission issues: Problems within the automatic transmission itself can cause vibrations under load (acceleration). Worn internal components, low transmission fluid, or a failing torque converter are possibilities. A slipping transmission might also manifest similarly.
* Engine mounts: Worn engine mounts allow excessive engine movement, which can transmit vibrations to the chassis, especially under the stress of acceleration.
* Wheel balance or tire issues: While less likely to only occur during acceleration, unbalanced wheels or tires with uneven wear can cause shaking. However, this usually manifests at higher speeds and consistently, not just under acceleration. Check your tire pressure too. Uneven pressure can contribute.
* Axle problems: Worn wheel bearings or CV joints (constant velocity joints) in the front-wheel-drive system can cause vibrations, particularly under acceleration.
* Exhaust system: While less common, a loose or damaged exhaust system can sometimes cause vibrations that are felt more strongly during acceleration.
Troubleshooting Steps:
1. Check the obvious: Start by inspecting your tires and wheels for obvious damage, uneven wear, or loose lug nuts. Check tire pressure.
2. Listen carefully: Pay close attention to the location and type of shake. Is it a high-frequency vibration or a low-frequency rumble? This can provide clues.
3. Professional inspection: Given the multiple possibilities, taking your car to a qualified mechanic is the best way to diagnose the problem accurately. They can perform a thorough inspection of the drivetrain components, including the driveshaft, transmission, engine mounts, and axles. They'll have the tools and experience to identify the source of the vibration.
Don't ignore the problem. Continuing to drive with a shaking car can lead to further damage and potentially dangerous situations.
