how to fix P0300 random misfire code in Ford Mustang S650 (2024-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Safety equipment: gloves and safety glasses.
• Disconnect the negative terminal of the battery.

2. Inspect and Replace Spark Plugs

• Remove the engine cover (if applicable) using a socket set.
• Use a spark plug socket to carefully remove each spark plug.
• Inspect for wear; replace any damaged or fouled plugs with OEM-spec plugs.
• Torque new spark plugs to manufacturer specifications (typically around 13-15 lb-ft).

3. Check and Replace Ignition Coils

• Locate the ignition coils on the engine.
• Disconnect the electrical connector from each coil.
• Remove the bolts securing the coils using a socket wrench.
• Replace any faulty coils with new ones, ensuring they match OEM specifications.
• Reconnect the electrical connectors securely.

4. Clean or Replace Fuel Injectors

• If injectors are clogged, use a fuel injector cleaner or replace them if they are severely damaged.
• To clean, remove the fuel rail if necessary using a socket set.
• Use a fuel injector cleaning kit to flush out any debris.
• Reinstall the injectors and ensure they are seated properly.

5. Check for Vacuum Leaks

• Inspect all vacuum lines for cracks or disconnections.
• Use a smoke machine or carb cleaner to identify leaks if necessary.
• Replace any damaged hoses or gaskets.