how to fix P0301 misfire code on Ford F-150 12th Generation (2009-2014)

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the battery to avoid any electrical shorts.
• Allow the engine to cool before starting repairs.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Fuel injector cleaner

2. Replace Spark Plug

1. Remove the ignition coil from cylinder 1 by unbolting it and disconnecting the electrical connector.
2. Use a socket to remove the spark plug from cylinder 1.
3. Inspect the old spark plug for signs of wear or fouling.
4. Install a new spark plug, ensuring it is gapped correctly according to manufacturer specifications (typically 0.054 inches for the F-150).
5. Torque the spark plug to the specified value (usually around 13-15 lb-ft).

3. Replace Ignition Coil

1. If the spark plug inspection indicates no issues, proceed to replace the ignition coil for cylinder 1.
2. Disconnect the electrical connector from the ignition coil.
3. Unbolt and remove the ignition coil from its mount.
4. Install the new ignition coil and secure it with the bolts.
5. Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

1. If the issue persists, check the fuel injector for cylinder 1.
2. Disconnect the fuel injector electrical connector and fuel line carefully.
3. Use a fuel injector cleaner to clean the injector or replace it if necessary.
4. Reconnect the fuel line and the electrical connector.

5. Perform Compression Test

1. Remove the spark plug for cylinder 1 again.
2. Insert the compression tester into the spark plug hole.
3. Crank the engine and record the compression reading.
4. If the compression is below the specified range (usually around 125-175 psi), further investigation into engine internals may be necessary.