why is my Toyota Highlander XU70 (2020-Present) shaking at idle

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Engine Mounts (if necessary)

• Tools Required: Socket set, torque wrench, jack and jack stands.
• Sub-steps:
  1. Lift the vehicle using a jack and secure it with jack stands.
  2. Visually inspect the engine mounts for cracks or separation.
  3. If damaged, remove the bolts securing the engine mount to the engine and frame.
  4. Replace with new engine mounts, tightening to manufacturer’s torque specifications (usually between 50-80 ft-lbs depending on the model).

3. Check and Replace Ignition Components (if necessary)

• Tools Required: Socket set, torque wrench, spark plug socket.
• Sub-steps:
  1. Remove the ignition coils by unscrewing the bolts and disconnecting the electrical connectors.
  2. Inspect spark plugs for wear; replace if gaps are excessive or electrodes are worn.
  3. Install new spark plugs, torquing to manufacturer specifications (typically around 13-16 ft-lbs).
  4. Reinstall ignition coils and ensure all connections are secure.

4. Repair Vacuum Leaks (if found)

• Tools Required: Pliers, hose clamps, vacuum gauge, RTV sealant (if necessary).
• Sub-steps:
  1. Identify and replace any damaged or cracked hoses.
  2. Use a vacuum gauge to check for proper vacuum; repair or replace components as necessary.
  3. If needed, apply RTV sealant to re-seal intake manifold gaskets.

5. Fuel System Inspection (if necessary)

• Tools Required: Fuel pressure gauge, basic hand tools.
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail to check pressure against manufacturer specifications.
  2. If pressure is low, check the fuel filter and pump for blockages or failures, replacing as necessary.