why is my Toyota Highlander shuddering when I accelerate

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery for safety.

2. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Disconnect electrical connectors from the ignition coils.
  3. Unscrew and remove the old spark plugs using a spark plug socket.
  4. Inspect the spark plugs for wear; replace if necessary.
  5. Gap the new spark plugs according to manufacturer specifications.
  6. Install new spark plugs and reconnect ignition coils.

Tools Required: Socket set, spark plug socket, torque wrench.

3. Check and Replace Transmission Fluid

• Sub-steps:
  1. Locate the transmission dipstick or fill plug.
  2. Remove the dipstick and check the fluid level; add fluid if low.
  3. If fluid is discolored or burnt, drain the transmission fluid using a pan.
  4. Replace the transmission fluid filter if equipped.
  5. Refill with new transmission fluid according to manufacturer specifications.

Tools Required: Transmission fluid, fluid pump, wrench set.

4. Inspect Drivetrain Components

• Sub-steps:
  1. Raise the vehicle using a jack and secure with jack stands.
  2. Visually inspect the driveshaft for any signs of damage or imbalance.
  3. Check CV joints and boots for tears or leaks; replace if necessary.
  4. Ensure all connections are tight and there are no loose parts.

Tools Required: Jack, jack stands, flashlight.