how to fix P0301 misfire in Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather tools and parts for the repair.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Allow the engine to cool before starting any work.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Locate the spark plug for cylinder 1 (typically near the front of the engine).
  2. Remove the ignition coil by unscrewing the bolts and disconnecting the electrical connector.
  3. Use a spark plug socket to remove the spark plug.
  4. Inspect the spark plug for wear, carbon buildup, or damage.
  5. If necessary, replace with a new spark plug (use OEM specifications).
  6. Reinstall the spark plug and ignition coil, ensuring proper torque (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• Sub-steps:
  1. If the spark plug is in good condition, test the ignition coil using a multimeter.
  2. If it is faulty, disconnect the electrical connector and remove the coil.
  3. Install a new ignition coil, ensuring it is seated properly.
  4. Reconnect the electrical connector and ensure all connections are secure.

4. Test Fuel Injector

• Sub-steps:
  1. Locate the fuel injector for cylinder 1.
  2. Disconnect the electrical connector from the injector.
  3. Use a noid light to check if the injector is receiving a signal.
  4. If not firing, check wiring for damage or corrosion.
  5. If the injector is faulty, replace it with a new one.
  6. Reconnect the electrical connector.

5. Perform Compression Test

• Sub-steps:
  1. Remove all spark plugs to allow for easier cranking.
  2. Insert the compression gauge into the spark plug hole of cylinder 1.
  3. Crank the engine for a few seconds and record the reading.
  4. Compare the readings across all cylinders; if significantly lower, check for internal engine issues.

6. Check for Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections around the intake manifold.
  2. Use a smoke machine or carburetor cleaner to identify leaks.
  3. Repair or replace any damaged hoses or gaskets.