how to diagnose P0301 misfire code in my Ford F-150 14th Generation (2021-2024)

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Disconnect the negative battery cable to avoid electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Remove the engine cover if necessary using a socket set.
• Disconnect the ignition coil connector from cylinder 1.
• Remove the ignition coil by unbolting it and pulling it out.
• Unscrew the spark plug using a spark plug socket and ratchet.
• Inspect the spark plug for wear or deposits. If damaged, replace it with a new one (refer to the manufacturer’s specifications for the correct part number).
• Apply anti-seize compound on the threads of the new spark plug and install it to the specified torque (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cracks or damage.
• If defective, install a new ignition coil, ensuring it is securely bolted and the connector is properly attached.

4. Check Fuel Injector

• If misfire persists, check the fuel injector for cylinder 1.
• Remove the fuel rail if necessary to access the injector.
• Inspect the injector for clogs or damage; replace if necessary.
• Reinstall the fuel rail ensuring proper sealing and torque specifications.

5. Perform Compression Test

• If issues continue, perform a compression test on cylinder 1.
• Remove the spark plug from cylinder 1 and install the compression gauge.
• Crank the engine and read the compression value. Compare with manufacturer specifications.
• If compression is low, further investigation into internal engine components may be necessary.