- Engine Mounts: These rubber or hydraulic mounts secure the engine to the chassis and absorb vibrations. Worn or damaged engine mounts can cause noticeable shaking at idle.
- Vacuum Leak: A vacuum leak can cause the engine to run lean and disrupt smooth operation, leading to vibrations at idle.
- Ignition Issues: Faulty spark plugs, ignition coils, or problems with the distributor cap (on older vehicles) can disrupt combustion and result in shaking.
- Fuel Delivery Problems: Issues with the fuel injector, fuel pump, or fuel filter can affect the fuel mixture and lead to shaking at idle.
- Idle Air Control (IAC) Valve: The IAC valve regulates the air bypass around the throttle plate to maintain a steady idle speed. A dirty or malfunctioning IAC valve can cause idle fluctuations and shaking.
Car jerking while braking:
- Faulty Brake Discs/Rotors: If the brake discs are excessively worn or warped, it can lead to uneven friction during braking, causing the car to jerk.
- Brake Fluid Issues: Low or dirty brake fluid can affect braking performance and cause jerky movements.
- Damaged Brake Calipers or Wheel Cylinders: These components apply hydraulic pressure to the brake pads/shoes, and their failure can result in uneven braking and jerking.
- Worn Tie Rod Ends or Ball Joints: Worn front-end components can introduce play in the steering and suspension, affecting the vehicle's stability and causing jerking during braking.
- Tire Problems: Uneven tread wear, incorrect tire pressure, or a loose lug nut can cause vibrations while braking.
If you experience severe shaking or jerking, it's important to have the vehicle inspected by a qualified mechanic as soon as possible to prevent further damage and ensure safe driving conditions.
