my Ford Mustang S550 (2015-2023) has a hard time starting what could be wrong

Solution

1. Preparation

• Gather tools: socket set, multimeter, OBD-II scanner, fuel pressure gauge.
• Ensure the vehicle is in a well-ventilated area and the ignition is off.

2. Battery Inspection

• Remove the negative battery terminal first, then the positive terminal.
• Clean any corrosion from the terminals using a wire brush and a mixture of baking soda and water.
• Tighten the terminal connections securely and reconnect the positive terminal first, followed by the negative terminal.

3. Starter Motor Testing

• Locate the starter motor beneath the vehicle.
• Disconnect the wiring harness from the starter motor.
• Using jumper cables, connect the positive lead to the starter terminal and the negative lead to the starter body.
• If the starter engages, it is functioning properly; otherwise, replace the starter.

4. Fuel System Check

• Locate the fuel pump relay in the fuse box.
• Use the multimeter to test the relay for continuity; replace if faulty.
• If the relay is good, check the fuel pump by turning on the ignition (do not start the engine) and listening for operation.
• If no sound is heard, replace the fuel pump.