my Ford F-150 12th Generation (2009-2014) stalls when I come to a stop why

Solution

1. Preparation

• Gather tools: OBD-II scanner, fuel pressure gauge, multimeter, socket set, and cleaning supplies.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Check Fuel Pressure

• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition key to the "ON" position without starting the engine and read the pressure.
  3. Compare the reading to the manufacturer's specifications (typically 30-45 PSI for most F-150s).
• Tools Required: Fuel pressure gauge
• Safety Warnings: Handle fuel with care, as it is flammable.

3. Inspect and Clean the IAC Valve

• Sub-steps:
  1. Remove the air intake duct to access the IAC valve.
  2. Disconnect the electrical connector from the IAC valve.
  3. Remove the IAC valve using a socket wrench.
  4. Clean the valve and its mounting surface with throttle body cleaner.
  5. Reinstall the IAC valve and reconnect the electrical connector.
• Tools Required: Socket set, throttle body cleaner

4. Test and Replace TPS (if necessary)

• Sub-steps:
  1. Disconnect the TPS connector.
  2. Use a multimeter to test the resistance across the sensor terminals.
  3. If readings are outside of the specified range, replace the TPS with a new unit.
  4. Reconnect the TPS connector and clear any stored codes from the OBD-II scanner.
• Tools Required: Multimeter, socket set