how to diagnose a misfire in my Toyota Camry with P0302 code

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before proceeding.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, multimeter
• Remove the ignition coil and spark plug from cylinder 2.
  • Use the spark plug socket to unscrew the spark plug.
  • Inspect the spark plug for wear and carbon buildup; replace if damaged.
• Test the ignition coil:
  • Use a multimeter to check the primary and secondary resistance.
  • Replace the ignition coil if it fails the test.

3. Check and Replace Fuel Injector

• Tools Required: Fuel injector puller, cleaning solvent
• Disconnect the fuel injector connector and remove the injector from cylinder 2.
  • Inspect the fuel injector for clogs or damage; clean or replace if necessary.
• Reinstall the injector and reconnect the wiring.

4. Perform Compression Test (if necessary)

• Tools Required: Compression gauge
• Insert the compression gauge into the spark plug hole of cylinder 2.
• Crank the engine and record the compression reading.
  • Compare the reading with manufacturer specifications. If low, further investigation is needed for potential internal engine issues.

5. Reassemble and Reconnect

• Reinstall the spark plug and ignition coil.
• Reconnect the battery and ensure all components are securely fastened.