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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Ignition Components

1. Remove the engine cover if applicable.
2. Locate the ignition coil for cylinder 1.
3. Disconnect the electrical connector from the ignition coil.
4. Remove the ignition coil by unscrewing it and pulling it straight out.
5. Inspect the spark plug for wear or damage; replace if necessary.
   • Torque specification for spark plug: 13 lb-ft (18 Nm).
6. Install the new spark plug into the cylinder head.
7. Reinstall the ignition coil and reconnect the electrical connector.

3. Check Fuel Injector

1. Locate the fuel injector for cylinder 1.
2. Disconnect the fuel injector connector.
3. Use a multimeter to test the injector's resistance.
   • Acceptable range: 12-16 ohms.
4. If faulty, remove the fuel injector and replace it.
5. Reconnect the fuel injector connector.

4. Inspect for Vacuum Leaks

1. Start the engine and use a smoke machine or carburetor cleaner around the intake manifold and throttle body.
2. Observe for smoke or changes in RPM indicating a leak.
3. If a vacuum leak is found, replace the affected gasket or hose.

5. Perform Compression Test (if required)

1. Remove the spark plug from cylinder 1.
2. Install the compression tester into the spark plug hole.
3. Crank the engine for a few seconds and record the compression reading.
   • Acceptable range: 180-200 psi.
4. If compression is low, further investigation is needed for internal engine issues.