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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester.
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before starting any repairs.

2. Replace Spark Plug

1. Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
2. Disconnect the electrical connector from the ignition coil.
3. Using a spark plug socket, remove the old spark plug from cylinder 1.
4. Inspect the new spark plug for correct gap specifications (refer to manufacturer’s specifications).
5. Install the new spark plug to the specified torque (usually around 13-15 lb-ft).
6. Reinstall the ignition coil and reconnect the electrical connector.

3. Test and Replace Ignition Coil (if necessary)

1. Using a multimeter, measure the primary and secondary resistance of the ignition coil.
2. If readings are outside the manufacturer's specified range, replace the ignition coil.
3. Install the new ignition coil in the reverse order of removal.

4. Inspect and Clean Fuel Injector

1. Remove the fuel rail to access the fuel injector for cylinder 1.
2. Disconnect the electrical connector and fuel line from the injector.
3. Inspect the injector for clogs or debris and clean using appropriate injector cleaner.
4. Reinstall the fuel injector and ensure it is seated correctly in the fuel rail.

5. Perform Compression Test

1. Remove the spark plug from cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine several times and record the compression reading.
4. Compare the reading to the manufacturer's specifications. If low, further inspection of internal engine components may be required.

6. Check for Vacuum Leaks

1. Inspect hoses connected to the intake manifold for cracks or loose connections.
2. Use a smoke tester or carburetor cleaner to check for leaks while the engine is running.
3. Repair or replace any damaged hoses or components.