how do I fix the misfire in my Honda Civic with code P0302?

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface, engine is off, and is allowed to cool.
• Disconnect the battery to avoid electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench.
• Remove the ignition coil from cylinder 2.
• Use the spark plug socket to remove the old spark plug.
• Inspect the spark plug gap and threads for damage.
• Install a new spark plug, ensuring the gap is set to manufacturer specifications (typically around 0.044 inches for Honda).
• Torque the spark plug to the manufacturer’s specification (usually around 13 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set, multimeter.
• Test the ignition coil for cylinder 2 using a multimeter to check for resistance within specifications (typically between 0.5 - 1.5 ohms).
• If faulty, remove the ignition coil and replace it with a new one.
• Reinstall the ignition coil and ensure it is securely fastened.

4. Inspect and Replace Fuel Injector

• Tools Required: Injector puller tool (if necessary), fuel line disconnect tool.
• Disconnect the electrical connector from the fuel injector for cylinder 2.
• Remove the fuel rail if necessary to access the injector.
• Inspect injector operation with a noid light or by ohm testing.
• Replace the fuel injector if it is faulty, ensuring proper sealing and connection upon installation.

5. Reassemble and Reconnect

• Reinstall any components removed during the repair.
• Reconnect the battery terminal.
• Start the engine and allow it to reach normal operating temperature.