how to repair a Honda Pilot YF3 (2016-2022) with a P0301 misfire code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery (negative terminal) to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, spark plug socket, ratchet.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from the ignition coil on cylinder 1.
• Remove the ignition coil by unscrewing the mounting bolts and pulling it out.
• Remove the spark plug using the spark plug socket and ratchet; inspect for wear or fouling.
• Install a new spark plug (torque to manufacturer specifications, typically around 13 lb-ft).
• Install the new ignition coil, secure it with bolts, and reconnect the ignition coil connector.

3. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel line removal tool, socket set, torque wrench.
• Relieve the fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the fuel injector connector and remove any retaining clips.
• Use the fuel line removal tool to disconnect the fuel line from the injector.
• Remove the old fuel injector by unscrewing it from the intake manifold.
• Install the new fuel injector, ensuring it is seated correctly.
• Reconnect the fuel line and electrical connector to the injector.

4. Check Compression (if necessary)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine a few times.
• Record the compression reading; it should typically be within the manufacturer's specified range.
• If the compression is low, further investigation (valve issues, head gasket) may be required.