how to fix the engine misfire in my Toyota Camry with code P0302

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2:
  • Use a socket set to remove the bolts securing the ignition coil.
  • Carefully pull the ignition coil straight up to avoid damaging it.
• Remove the spark plug:
  • Use a spark plug socket to unscrew the spark plug from cylinder 2.
  • Inspect the spark plug for wear or damage. Replace if necessary.
• Install a new spark plug:
  • Apply anti-seize lubricant on the threads (if applicable).
  • Torque the spark plug to manufacturer specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil:
  • Ensure the coil is seated properly and reattach the securing bolts.

3. Inspect and Replace Fuel Injector (if necessary)

• Disconnect the fuel injector connector:
  • Carefully release the locking tab and pull the connector off.
• Remove the fuel injector:
  • Use a fuel injector removal tool if necessary, and unscrew the injector from the fuel rail.
• Inspect the injector for blockage or wear. Replace if damaged.
• Install a new fuel injector:
  • Lubricate the O-ring with clean engine oil and insert it into the fuel rail.
  • Secure the injector and reconnect the electrical connector.

4. Compression Test

• Reinstall the ignition coil and spark plug temporarily.
• Remove the fuel pump relay to disable fuel delivery.
• Crank the engine and use a compression gauge in cylinder 2:
  • Record the pressure reading and compare it to manufacturer specifications.
• If compression is low, further engine diagnostics may be needed.

5. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0302 code and any other stored codes.