why does my Toyota RAV4 Fifth Generation (2019-present) have a rough start after sitting

Solution

1. Preparation

• Gather tools and materials including an OBD-II scanner, fuel pressure gauge, multimeter, socket set, and replacement parts if needed.
• Ensure the vehicle is on a level surface and the ignition is turned off.

2. Battery and Connections Check

• Sub-steps:
  1. Disconnect the negative terminal of the battery.
  2. Clean the battery terminals and cable connections using a wire brush.
  3. Reconnect the battery terminals securely.
• Tools Required: Wire brush, socket set.
• Safety Warnings: Disconnect battery before working on electrical systems.

3. Fuel System Inspection

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure.
  3. If the pressure is below specifications (consult service manual), replace the fuel pump or filter as necessary.
• Tools Required: Fuel pressure gauge.

4. Ignition System Repair

• Sub-steps:
  1. Remove the ignition coils from the spark plugs.
  2. Test each ignition coil with a multimeter to ensure it is within resistance specifications.
  3. Replace any faulty ignition coils.
  4. Reinstall the ignition coils and secure them in place.
• Tools Required: Multimeter, socket set.

5. Fuel Injector Maintenance

• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Inspect for any signs of clogging or leaks.
  3. Clean the injectors using a suitable fuel injector cleaner or replace if necessary.
  4. Reinstall the fuel injectors ensuring proper alignment and secure connections.
• Tools Required: Socket set, fuel injector cleaner.