my Honda Pilot YF3 (2016-2022) engine misfires under load what's wrong

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Scan and Review Codes

• Connect an OBD-II scanner.
• Record any misfire-related trouble codes (P0300-P0306).
• Clear codes and take the vehicle for a test drive to see if codes reappear.

3. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the engine cover if applicable.
• Disconnect the ignition coils and remove them along with the spark plugs.
• Inspect the spark plugs for wear; replace if fouled or worn beyond specifications.
• Use a gap gauge to ensure proper gap (0.044 inches for Honda).
• Reinstall spark plugs and coils, torquing to manufacturer specifications (typically 13 lb-ft).

4. Check and Replace Ignition Coils

• Tools Required: Socket set and torque wrench.
• With the ignition coils removed, inspect for cracks or carbon tracking.
• Replace any faulty ignition coils with OEM parts.
• Reinstall coils, ensuring connections are secure and torqued as per specifications.

5. Fuel System Inspection

• Tools Required: Fuel pressure gauge.
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the "on" position (do not start the engine).
• Check if the fuel pressure is within the manufacturer's specifications (typically around 30-40 psi).
• If not, inspect the fuel pump and filter; replace as necessary.

6. Final Assembly and Testing

• Reinstall any components removed for access.
• Start the engine and allow it to reach operating temperature.
• Perform a test drive under load conditions to ensure that the misfire has been resolved.