my Ford F-150 12th Generation (2009-2014) has a rough idle and stalls at red lights

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, throttle body cleaner, MAF sensor cleaner, multimeter, and basic hand tools.
• Safety Warnings: Disconnect the battery before working on electrical systems. Allow the engine to cool before inspecting components.

2. Address Error Codes

• Use the OBD-II scanner to retrieve any stored error codes.
• Document the codes for reference and clear them to see if they reappear after repairs.

3. Clean or Replace Throttle Body

• Remove the air intake duct connected to the throttle body using a socket set.
• Clean the throttle body interior with throttle body cleaner and a soft cloth.
• Reinstall the duct securely, ensuring there are no air leaks.

4. Inspect and Clean MAF Sensor

• Disconnect the MAF sensor's electrical connector.
• Remove the MAF sensor from the air intake system using a socket set.
• Clean the MAF sensor with MAF sensor cleaner. Avoid touching the sensor elements directly.
• Reinstall the sensor and reconnect the electrical connector.

5. Check Fuel Pressure

• Attach the fuel pressure gauge to the fuel rail's Schrader valve.
• Turn the ignition to the "ON" position without starting the engine and check the fuel pressure. It should meet the manufacturer’s specifications (usually around 30-50 psi depending on the engine).
• If the pressure is low, check the fuel pump and filter.

6. Inspect Ignition System

• Remove the spark plugs using a socket set.
• Inspect for wear, carbon buildup, or damage. Replace with OEM spark plugs if necessary.
• Test the ignition coils with a multimeter to verify they are within specifications. Replace any faulty coils.