why does my Ford F-150 13th Generation (2015-2020) have a check engine light with code P0300

Diagnose and fix P0300 engine misfire in Ford F-150 13th Generation (2015-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, multimeter, socket set, torque wrench, replacement spark plugs, ignition coils (if needed), and a fuel pressure gauge.
• Ensure the vehicle is parked on a level surface, and the engine is cool.

2. Inspect and Replace Spark Plugs

1. Remove the engine cover if applicable to access spark plugs.
2. Disconnect the negative battery terminal to avoid electrical shorts.
3. Using a socket set, remove the spark plug wires or ignition coils to access the spark plugs.
4. Inspect each spark plug for signs of wear, fouling, or damage.
5. Replace with new spark plugs, ensuring to gap them according to the manufacturer's specifications.
6. Reinstall ignition coils or spark plug wires, ensuring they are secured properly.

3. Check and Replace Ignition Coils (if necessary)

1. Test each ignition coil with a multimeter; check for resistance according to specifications.
2. If any ignition coil is faulty, remove it by unscrewing the bolts and disconnecting the electrical connector.
3. Install the new ignition coil in reverse order of removal, ensuring a secure connection.

4. Inspect Fuel System

1. Check fuel injectors for clogs or leaks; clean or replace as needed.
2. Measure fuel pressure using a fuel pressure gauge; compare to manufacturer's specifications.
3. If fuel pressure is low, check the fuel pump and filter for issues.

5. Check for Vacuum Leaks

1. Start the engine and listen for hissing sounds around vacuum lines.
2. Use a smoke machine or carburetor cleaner to identify leaks by observing changes in engine RPM.
3. Replace any damaged vacuum lines.