how to address the P0301 misfire code in my Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools and parts: OBD-II scanner, socket set, torque wrench, compression tester, new spark plug, new ignition coil (if needed), and injector cleaning kit.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect Spark Plug and Ignition Coil

• Remove the engine cover (if applicable).
• Use a socket wrench to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear (carbon buildup, oil contamination).
  • If damaged, replace with a new spark plug, ensuring it meets manufacturer specifications (torque to 13 lb-ft).
• Remove the ignition coil from cylinder 1 by unbolting and disconnecting the electrical connector.
• Inspect the ignition coil for cracks or corrosion.
  • If damaged, replace with a new ignition coil.

3. Test Fuel Injector

• Disconnect the fuel injector connector for cylinder 1.
• Use a noid light to check for proper pulse from the engine control unit (ECU).
  • If no signal, trace wiring back to the ECU or replace the injector.
• If the injector is suspected to be clogged, use an injector cleaning kit to clean it or replace it with a new one.

4. Conduct Compression Test

• Install a compression tester in cylinder 1's spark plug hole.
• Crank the engine for several seconds and record the compression reading.
  • If compression is below 120 psi, further investigation is needed for potential internal engine problems (valves, piston rings).

5. Inspect for Vacuum Leaks

• Visually inspect and feel for any air leaks around hoses and the intake manifold.
• Use a smoke machine or carburetor cleaner to check for leaks while the engine is running.
  • If leaks are found, replace damaged hoses or reseal the intake manifold.

6. Verify MAF and TPS Operation

• Use a multimeter to check the MAF and TPS readings against manufacturer's specifications.
  • If out of range, replace the faulty sensor.