how to fix P0302 misfire code in Honda Accord 8th Generation (2008-2012)

Solution

1. Preparation

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

2. Inspect and Replace Ignition Components

1. Remove Engine Cover (if applicable)
   • Use a socket set to remove the bolts securing the engine cover.
2. Inspect Spark Plug
   • Remove the spark plug for cylinder 2 using a spark plug socket.
   • Check for wear, carbon deposits, or damage. Replace if necessary.
   • Recommended spark plug gap: 0.043 inches (1.1 mm).
3. Check Ignition Coil
   • Disconnect the ignition coil connector and remove the coil from cylinder 2.
   • Inspect for cracks or carbon tracking and replace if defective.
4. Reinstall Components
   • Reinstall the new spark plug and ignition coil for cylinder 2.
   • Reconnect the ignition coil connector.

3. Inspect and Replace Fuel Injector

1. Remove Fuel Rail
   • Relieve fuel pressure by removing the fuel pump fuse and starting the engine until it stalls.
   • Disconnect fuel lines and remove the fuel rail as per manufacturer guidelines.
2. Test Fuel Injector
   • Use a multimeter to check the resistance of the fuel injector. Replace if it is out of specification (typically around 12-16 Ohms).
3. Reinstall Fuel Rail
   • Reinstall the fuel rail and connect fuel lines securely.

4. Perform Compression Test

1. Remove Spark Plug
   • Remove the spark plug from cylinder 2.
2. Attach Compression Gauge
   • Insert a compression gauge into the spark plug hole.
3. Crank Engine
   • Crank the engine several times and record the pressure reading. It should be within the manufacturer's specified range (typically around 180-220 PSI).
4. Reinstall Spark Plug
   • Reinstall the spark plug after testing.

5. Check for Vacuum Leaks

• Inspect all vacuum lines and gaskets for leaks, especially around the intake manifold.
• Replace any damaged hoses or gaskets.