my Ford F-150 Fourteenth Generation (2021-present) has a rough idle at cold start what's wrong

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, multimeter, vacuum gauge.
• Disconnect the battery before beginning any electrical work.
• Allow the engine to cool before proceeding with inspections.

2. Address Faulty Sensors

a. Replace the Engine Coolant Temperature Sensor

• Locate the sensor on the engine block.
• Disconnect the electrical connector from the sensor.
• Remove the sensor using a socket wrench.
• Install the new coolant temperature sensor and reconnect the electrical connector.
• Torque specification: 15 ft-lbs.

3. Replace Spark Plugs

a. Remove Old Spark Plugs

• Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
• Use a spark plug socket to carefully remove the old spark plugs.

b. Install New Spark Plugs

• Ensure the new spark plugs have the correct gap (typically 0.054 inches for F-150).
• Install the new spark plugs by hand to avoid cross-threading, then torque to 13 ft-lbs.

4. Repair or Replace Air Intake Components

a. Inspect and Replace Air Filter

• Remove the air filter housing cover by unscrewing the clamps or bolts.
• Take out the old air filter and replace it with a new one.
• Reassemble the air filter housing.

b. Check and Repair Intake Hoses

• Inspect all intake hoses for cracks or loose connections.
• Replace any damaged hoses to ensure a tight fit.

5. Check and Adjust Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "on" position without starting the engine to check the fuel pressure.
• Ensure that the pressure is within the manufacturer's specifications (typically around 50-60 psi). If not, replace the fuel pump or check the fuel filter for clogs.