how to diagnose P0302 misfire on Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, extension.
• Sub-steps:
  1. Remove the engine cover (if applicable) by unscrewing any fasteners.
  2. Locate the spark plug for cylinder 2.
  3. Disconnect the ignition coil connector.
  4. Remove the ignition coil bolt and lift it out.
  5. Use a spark plug socket to remove the old spark plug.
  6. Inspect the old spark plug for signs of wear, fouling, or damage.
  7. Install a new spark plug, ensuring it is torqued to the manufacturer's specification (typically around 13 lb-ft).

3. Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Sub-steps:
  1. With the spark plug removed, install the new ignition coil onto the spark plug.
  2. Reconnect the ignition coil connector until it clicks in place.
  3. Secure the ignition coil with its mounting bolt to the specified torque.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, cleaning tools.
• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Remove the fuel injector using a socket set.
  3. Clean the injector using a fuel injector cleaner and follow the manufacturer's instructions.
  4. Reinstall the fuel injector and reconnect its electrical connector.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle.
• Verify that the check engine light is off and monitor engine performance.