why does my Ford F-150 12th Generation (2009-2014) stall at stop lights

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Fuel System Inspection

• Tools Required: Fuel pressure gauge, wrench set
  1. Connect the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition key to the ON position (do not start the engine) and check fuel pressure readings.
  3. If pressure is below specifications, replace the fuel pump and/or filter as needed.

3. Ignition System Repair

• Tools Required: Socket set, torque wrench
  1. Remove engine covers as necessary to access spark plugs and ignition coils.
  2. Inspect and replace spark plugs if worn or fouled (Torque specification: 13 lb-ft).
  3. Test ignition coils for resistance using a multimeter; replace any faulty coils.

4. Vacuum System Repair

• Tools Required: Vacuum gauge, hose clamp pliers
  1. Visually inspect all vacuum hoses for cracks or leaks.
  2. Repair or replace any damaged hoses.
  3. If the IAC valve is suspected, remove and clean it with throttle body cleaner before reinstalling.

5. Reassembly and Testing

• Reconnect the battery.
• Start the engine and let it idle; observe for any irregularities or stalling.
• If all repairs are complete and the engine runs smoothly, reassemble any removed components.