what does a P0304 code mean for my Honda CR-V

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the ignition coil for cylinder 4 by unscrewing its mounting bolts and disconnecting the electrical connector.
• Remove the spark plug from cylinder 4 using a spark plug socket.
• Inspect the spark plug for wear or fouling; replace if needed.
• Install the new spark plug, ensuring it is torqued to the manufacturer’s specification (typically around 13 lb-ft).

3. Check and Replace Ignition Coil

• If the spark plug appears in good condition, test the ignition coil with a multimeter to check for proper resistance.
• Tools Required: Multimeter
• Replace the ignition coil for cylinder 4 if it is faulty.
• Reinstall the ignition coil and reconnect the electrical connector.

4. Inspect Fuel Injector

• Check the fuel injector for cylinder 4 using a noid light to ensure it is receiving the proper signal.
• If the injector is not functioning, replace it with a new one.
• Parts Required: Fuel injector (if replacement is necessary)

5. Compression Test

• If misfiring persists, perform a compression test on cylinder 4.
• Tools Required: Compression tester
• Compare the compression reading with specifications; if low, further investigation of engine internals may be necessary.