how to fix P0301 misfire code Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before working on any components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Remove the spark plug wire or ignition coil from cylinder 1.
• Use a spark plug socket and ratchet to remove the old spark plug.
• Inspect the new spark plug for proper gap (0.043 inches for Honda Accord).
• Install the new spark plug and torque to specifications (13 lb-ft).
• Reattach the ignition coil or spark plug wire securely.

3. Test/Replace Ignition Coil

• Tools Required: Multimeter.
• Disconnect the ignition coil connector.
• Measure the resistance of the ignition coil (primary and secondary).
  • Primary: 0.4-0.6 ohms
  • Secondary: 6.0-10.0 k ohms
• If outside specifications, replace the ignition coil with a new part.
• Reconnect the ignition coil and ensure all connections are secure.

4. Check Fuel Injector

• Tools Required: Fuel injector cleaner (if needed), multimeter.
• Disconnect the fuel injector connector.
• Test the injector resistance (should be around 12-16 ohms).
• If resistance is out of specification, replace the fuel injector.
• If the injector is good, consider cleaning it with a fuel injector cleaner.

5. Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole.
• Crank the engine and record the reading.
• Compare with specifications (should be around 190-210 psi).
• If compression is low, investigate further for possible mechanical issues.