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

Solution

1. Preparation

• Gather tools and parts before starting the repair.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before proceeding with any work.

2. Replace Ignition Components

Tools Required:

• Socket set
• Torque wrench
• Spark plug socket
• Ignition coil puller (if applicable)

Steps:

1. Remove Engine Cover (if present):

   • Use the socket set to remove any bolts securing the engine cover.
   • Carefully lift off the cover and set aside.

2. Replace Spark Plugs:

   • Remove the ignition coils by disconnecting the electrical connectors and unbolting them.
   • Use the spark plug socket to carefully unscrew and remove the old spark plugs.
   • Apply anti-seize lubricant on the threads of the new spark plugs.
   • Install the new spark plugs to the manufacturer’s torque specifications (typically around 13-15 lb-ft).
   • Reinstall the ignition coils and ensure they are seated properly.

3. Inspect and Replace Fuel System Components (if necessary)

Tools Required:

• Fuel pressure gauge
• Wrench set
• Safety goggles

Steps:

1. Check Fuel Pressure:

   • Attach the fuel pressure gauge to the fuel rail's test port.
   • Turn the ignition key to the "ON" position without starting the engine. Check the fuel pressure reading.
   • If the pressure is below specification, consider replacing the fuel pump or fuel filter.

2. Replace Fuel Filter (if applicable):

   • Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
   • Disconnect the fuel lines from the filter using the appropriate tools.
   • Replace the fuel filter with a new one, ensuring proper orientation and secure connections.

4. Reset Engine Codes

• Reconnect the battery and use the OBD-II scanner to clear any stored trouble codes.
• Start the engine and monitor for any reoccurrence of the P0300 code.