why does my Toyota RAV4 feel like it’s losing power on the highway?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, multimeter, torque wrench.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool before beginning any work.

2. Addressing Error Codes

• Sub-steps:
  • Use the OBD-II scanner to retrieve error codes.
  • Note any specific codes related to the power loss (e.g., P0300 for misfires).
  • Clear the codes and take the vehicle for a test drive to see if they return.

3. Replacing Air Filter

• Sub-steps:
  • Locate the air filter housing and open it.
  • Remove the old air filter and inspect it for dirt and damage.
  • Install a new, clean air filter, ensuring a snug fit.
  • Reassemble the air filter housing.

4. Testing and Replacing Fuel Pump (if necessary)

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Turn on the ignition to check the fuel pressure reading; it should match the manufacturer's specifications (usually around 30-50 psi).
  • If low, replace the fuel pump as follows:
    • Relieve fuel system pressure.
    • Disconnect the fuel lines and electrical connectors.
    • Remove the fuel pump module from the tank.
    • Install the new fuel pump, reconnect lines, and test for leaks.

5. Inspecting and Replacing Spark Plugs

• Sub-steps:
  • Remove the ignition coil covers and coils to access the spark plugs.
  • Use a spark plug socket to remove the old spark plugs.
  • Inspect the plugs for wear and replace them with new ones, ensuring proper torque (usually around 13-15 lb-ft).
  • Reinstall the ignition coils.

6. Cleaning Throttle Body

• Sub-steps:
  • Remove the intake duct to access the throttle body.
  • Use throttle body cleaner and a soft rag to clean the inside of the throttle body.
  • Ensure the throttle plate moves freely and reinstall the intake duct.