what should I do if my Toyota RAV4 engine is misfiring and showing P0302 code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2.
  • Tools: Socket set (specific size for ignition coil).
• Remove the spark plug using a spark plug socket.
  • Inspect for signs of wear (e.g., excessive gap, carbon buildup).
  • If necessary, replace with a new spark plug that matches OEM specifications.
  • Torque the new spark plug to manufacturer specifications (typically 13-15 lb-ft).
• Reinstall the ignition coil and ensure it clips securely.

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, proceed to check the ignition coil.
  • Test the resistance of the coil using a multimeter.
  • If the resistance is outside the specified range, replace the ignition coil with a new one.
• Reinstall the ignition coil and ensure it is properly connected.

4. Fuel Injector Inspection and Replacement

• If the issue persists, inspect the fuel injector for cylinder 2.
  • Remove the fuel rail to access the injector.
  • Use a noid light to check for signal to the injector.
  • If there is no signal, further diagnose the wiring or replace the injector if faulty.
• Install the new fuel injector and reassemble the fuel rail.

5. Final Checks

• Reconnect the battery.
• Clear any stored codes using the OBD-II scanner.
• Start the engine and observe for smooth operation.