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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety while working.
• Tools Required: OBD-II scanner, socket set, torque wrench, vacuum gauge, multimeter.

2. Replace Spark Plugs

• Remove Engine Cover (if applicable):
  • Use a socket set to remove any bolts securing the engine cover.
• Remove Spark Plugs:
  • Use a spark plug socket to carefully unscrew and extract the spark plugs.
• Install New Spark Plugs:
  • Check the gap on the new spark plugs using a feeler gauge and adjust if necessary.
  • Hand-tighten the new spark plugs and then torque to the manufacturer’s specifications (typically 13-15 lb-ft).

3. Inspect and Replace Ignition Coils

• Remove Ignition Coils:
  • Disconnect the electrical connector from each ignition coil.
  • Use a socket to unbolt the ignition coils and lift them out.
• Test Ignition Coils:
  • Use a multimeter to check the resistance of the ignition coils; replace any that are out of specification.
• Install New Ignition Coils:
  • Position the new coils and secure them with bolts, then reconnect the electrical connectors.

4. Clean Fuel Injectors

• Remove Fuel Rail (if necessary):
  • Relieve fuel pressure by removing the fuel pump relay and running the engine until it stalls.
  • Disconnect fuel lines and unbolt the fuel rail.
• Clean or Replace Injectors:
  • Use a fuel injector cleaning kit or replace the injectors if they are faulty.
• Reinstall Fuel Rail:
  • Ensure all O-rings are properly seated before reattaching the fuel rail.

5. Inspect Air Intake System

• Check MAF Sensor:
  • Remove the MAF sensor and clean it with MAF cleaner.
• Check for Air Leaks:
  • Inspect hoses and gaskets for cracks or wear. Replace any damaged components.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal and use the OBD-II scanner to clear all codes.