1. Engine Misfire: A misfiring engine can cause the vehicle to shake due to uneven combustion. Check for any fault codes related to misfires and replace faulty spark plugs, ignition coils, or fuel injectors as needed.
2. Transmission Issue: A faulty transmission, such as a slipping clutch or damaged transmission mounts, can also cause shaking when the vehicle is stopped in gear. Check the transmission fluid level and condition, inspect for leaks, and have it diagnosed by a professional if necessary.
3. Fuel Delivery Problem: A clogged or dirty fuel filter or a faulty fuel injector can disrupt the fuel supply, leading to engine shaking. Replace or clean the fuel filter and service the fuel injectors if needed.
4. Vacuum Leak: A vacuum leak can introduce unmeasured air into the engine, affecting its performance and causing vibrations. Check all vacuum hoses and connections for cracks, leaks, or disconnections.
5. Engine Mount Failure: Worn or broken engine mounts can allow excessive engine movement, resulting in vibrations. Inspect the engine mounts for any signs of damage or excessive play.
6. Damaged CV Joints: Worn-out or damaged constant velocity (CV) joints can cause vibrations when the vehicle is in gear and stopped. Check for clicking sounds, grease leaks, or visual signs of damage to the CV joints.
7. Wheel Imbalance: Unbalanced wheels can cause vibrations at certain speeds or when the vehicle is stopped. Have the wheels balanced and checked for any deformation or damage.
8. Driveline Issues: Problems with the driveshaft, differential, or other components in the driveline can cause vibrations at low speeds or when the vehicle is stopped. Inspect the driveline for any obvious signs of damage.
9. Torque Converter Problem: A faulty torque converter can cause the transmission to engage improperly or slip, resulting in vibrations. This is a more complex issue that might require professional diagnosis and repair.
Recommendation:
Since there can be multiple reasons for this issue, it's important to have your Lexus 300 diagnosed by a qualified mechanic to identify the exact cause of the shaking and determine the appropriate repairs or replacements needed to resolve the problem.
