how to fix Honda Pilot Third Generation (2016-present) P0301 misfire issue

Solution

1. Preparation

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

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the ignition coil from cylinder 1 by unscrewing the bolts and disconnecting the electrical connector.
• Extract the spark plug using a spark plug socket.
• Inspect the old spark plug for wear; replace with a new spark plug if necessary.
• Apply dielectric grease to the new spark plug’s threads for easier future removal.
• Install the new spark plug, tightening to the manufacturer's specified torque (usually around 13-16 ft-lbs).
• Reinstall the ignition coil, ensuring the electrical connector is securely attached.

3. Check Ignition Coil

• If the spark plug was not the issue, test the ignition coil using a multimeter to check for proper resistance.
• If faulty, replace the ignition coil with a new unit, ensuring proper alignment and connection.

4. Inspect Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Test the injector using a noid light to confirm it is receiving the signal.
• If the injector is not functioning, replace it with a new fuel injector and reconnect the wiring.

5. Repair Vacuum Leaks

• Inspect all vacuum hoses and the intake manifold gasket for any signs of damage or wear.
• Replace any damaged hoses or gaskets to ensure proper sealing.

6. Conduct Compression Test

• If misfire persists, perform a compression test on cylinder 1.
• If compression is low, further diagnostic steps may be needed to assess internal engine issues (e.g., valve or piston problems).