Honda Pilot Third Generation (2016-present) P0301 misfire how to diagnose

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative terminal of the battery for safety.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Noid light (for fuel injector testing)

2. Replace Spark Plug

1. Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts and disconnecting the electrical connector.
2. Remove the spark plug from cylinder 1 using a spark plug socket.
3. Inspect the new spark plug and ensure the gap is set to the manufacturer's specifications.
4. Install the new spark plug and torque it to the manufacturer's specification (typically around 13-15 lb-ft).
5. Reinstall the ignition coil and secure it in place.

3. Inspect/Replace Ignition Coil

1. If the ignition coil showed signs of damage, remove it as previously described.
2. Test the ignition coil's resistance using a multimeter to ensure it is within specifications (consult service manual for exact values).
3. If faulty, replace the ignition coil with a new one, ensuring it is seated properly.

4. Test Fuel Injector

1. If the injector was suspected, remove the fuel rail to access the injector for cylinder 1.
2. Test the injector using a noid light to ensure it is receiving the correct signal from the ECU.
3. If the injector is faulty, replace it and reassemble the fuel rail.

5. Perform Compression Test (if necessary)

1. Remove the spark plug for cylinder 1.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading. Compare it to manufacturer's specifications.
4. If compression is low, further investigation into potential internal engine issues may be required.