why does my Toyota RAV4 hesitate when I accelerate on the highway?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before beginning any work.

2. Addressing the Fuel System

• Check Fuel Pressure:

  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "On" position (without starting) and check the pressure.
  • If pressure is low, inspect the fuel filter and fuel pump for issues.

• Replace Fuel Filter (if necessary):

  • Locate the fuel filter (usually near the fuel tank or along the fuel line).
  • Remove the old filter using a wrench.
  • Install the new filter, ensuring the orientation matches the flow direction.

3. Inspect and Clean the Throttle Body

• Remove the Throttle Body:

  • Disconnect the electrical connector and vacuum hoses.
  • Unbolt the throttle body from the intake manifold.

• Clean the Throttle Body:

  • Use throttle body cleaner and a soft brush to remove carbon deposits.
  • Ensure the throttle plate moves freely after cleaning.

• Reinstall the Throttle Body:

  • Torque bolts to factory specifications (check service manual for values).
  • Reconnect all electrical connectors and hoses.

4. Check and Replace Ignition Components

• Inspect Spark Plugs:

  • Remove spark plugs using a socket wrench.
  • Check for wear or fouling and replace if necessary (use OEM recommended plugs).

• Test Ignition Coils:

  • Remove coils and test with a multimeter for proper resistance (consult specifications).
  • Replace any faulty coils.

5. Reconnect and Test

• Reconnect the battery.
• Start the engine and check for any error codes.
• Take the vehicle for a test drive to ensure the issue is resolved.