- Worn spark plugs or damaged ignition coils can lead to misfires.
- Misfires can cause the engine to run rough and shake, resulting in vibrations felt at idle.
2. Vacuum Leaks:
- Leaks in the vacuum hoses or systems can cause the engine to run lean (not enough fuel) or rich (too much fuel).
- This can lead to engine vibrations at idle.
3. Faulty Engine Mounts:
- Engine mounts are designed to absorb vibrations and keep the engine securely fastened to the vehicle's chassis.
- Worn or broken engine mounts can lead to excessive shaking at idle.
4. Damaged Flywheel or Flex Plate:
- The flywheel or flex plate is responsible for transferring power from the engine to the transmission.
- A damaged flywheel or flex plate can cause imbalances and vibrations at idle.
5. Transmission Issues:
- Problems with the transmission, such as low transmission fluid, torque converter issues, or faulty transmission mounts can cause the car to shake at idle.
6. Driveline Problems:
- Worn or damaged driveshaft components, faulty U-joints, or CV joints can lead to vibrations that are felt at idle.
7. Faulty Idle Control Valve (ICV):
- The ICV regulates the amount of air that bypasses the throttle body when the engine is idling.
- A faulty ICV can lead to rough idling and vibrations.
8. Fuel Delivery Issues:
- Problems with fuel delivery, such as a clogged fuel filter, a failing fuel pump, or injector issues, can lead to vibrations at idle.
9. Exhaust System Problems:
- A damaged exhaust manifold or a loose exhaust system can cause vibrations that are noticeable at idle.
10. Faulty O2 Sensors:
- Oxygen sensors provide feedback to the engine control unit (ECU) about the exhaust gases.
- Faulty O2 sensors can affect the air-fuel mixture and lead to shaking at idle.
It's essential to have the vehicle diagnosed by a professional mechanic to accurately identify and repair the cause of shaking at idle.
