how to fix my Toyota Highlander Third Generation (2014-2019) stalling when driving

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery negative terminal to prevent electrical shocks.
• Gather tools and parts required for the repair.

2. Fuel System Inspection

• Check Fuel Pump:
  • Locate the fuel pump relay and remove it.
  • Use a multimeter to test for proper voltage at the fuel pump connector while the ignition is in the "ON" position.
  • If there is no voltage, replace the fuel pump relay.
• Inspect Fuel Filter:
  • Locate the fuel filter, typically along the fuel line.
  • Disconnect the fuel lines (use a fuel line disconnect tool if necessary).
  • Replace the fuel filter if it shows signs of clogging or is overdue for replacement.

3. Ignition System Replacement

• Replace Spark Plugs:
  • Remove the ignition coil covers if applicable.
  • Disconnect the ignition coils and remove them using a socket set.
  • Unscrew and remove old spark plugs using a spark plug socket.
  • Install new spark plugs to the manufacturer's specified torque (typically around 13-15 ft-lbs).
  • Reinstall ignition coils and covers.

4. Throttle Body Cleaning

• Clean the Throttle Body:
  • Disconnect the air intake duct from the throttle body.
  • Remove the throttle body from the intake manifold (be careful of gaskets).
  • Clean the throttle body using throttle body cleaner and a soft brush.
  • Reassemble the throttle body with a new gasket if necessary.

5. Reassembly and Final Checks

• Reconnect the battery terminal.
• Ensure all components are securely fastened.
• Start the engine and allow it to reach operating temperature.