how to fix P0301 misfire code Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the engine is cool to prevent burns.
• Disconnect the negative terminal of the battery to avoid electrical shorts.

2. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove engine cover if applicable.
• Unscrew and remove the ignition coil from cylinder 1.
• Inspect the ignition coil for damage.
• If damaged, install a new ignition coil:
  • Apply a small amount of dielectric grease on the connector.
  • Position the new ignition coil and secure it with screws to the manufacturer's torque specification (usually around 7-10 lb-ft).

3. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench, gap gauge, anti-seize lubricant.
• Remove the spark plug from cylinder 1 using the spark plug socket.
• Inspect the spark plug for wear or fouling.
• If necessary, replace with a new spark plug:
  • Ensure the spark plug gap is set to the manufacturer’s specification (typically around 0.043 inches).
  • Apply a small amount of anti-seize lubricant to the threads.
  • Install the new spark plug and tighten it to the manufacturer’s torque specification (approximately 13-16 lb-ft).

4. Check and Replace Fuel Injector

• Tools Required: Fuel injector puller (if necessary), cleaning supplies.
• Disconnect the electrical connector from the fuel injector for cylinder 1.
• Remove the fuel line (caution: fuel may leak).
• Remove the fuel injector from the rail.
• Inspect for clogs or damage; clean or replace if necessary.
• Reinstall the injector, ensuring it is seated properly in the rail.

5. Compression Test

• Tools Required: Compression tester.
• Reconnect the ignition coil and spark plug for cylinder 1.
• Remove the fuel pump relay to prevent fuel delivery.
• Crank the engine and check the compression reading for cylinder 1.
• If the compression is below the manufacturer’s specification (around 150 psi), further engine diagnostics may be needed.