how to fix a Ford Mustang S550 (2015-2023) that randomly shuts off while driving

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Tools Required: OBD-II scanner, multimeter, socket set, fuel pressure gauge, basic hand tools.
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before inspecting components.

2. Address Electrical Issues

• Inspect the Battery:

  • Remove the battery terminals (negative first).
  • Clean the terminals and cable ends.
  • Check the battery voltage with a multimeter; it should be around 12.6 volts when fully charged.
  • If the battery is weak, replace it.

• Check Alternator:

  • Start the engine and use the multimeter to measure the voltage at the battery; it should read between 13.5-14.5 volts.
  • If not, test or replace the alternator.

3. Fuel System Inspection

• Examine Fuel Pump:
  • Remove the fuel pump relay and check for continuity with a multimeter.
  • If faulty, replace the fuel pump relay.
  • If the fuel pump is not functioning, access the fuel tank and replace the fuel pump.

4. Ignition System Repair

• Replace Spark Plugs and Coils:
  • Remove the engine cover if necessary.
  • Disconnect the ignition coil connectors and remove the coils using a socket set.
  • Replace worn spark plugs with new ones and reinstall the ignition coils, ensuring they are seated properly.

5. Wiring and Connectors Repair

• Inspect and Repair Wiring:
  • Visually inspect the wiring harness for signs of damage or corrosion.
  • Repair or replace any damaged wires or connectors using electrical tape or heat-shrink tubing as needed.