how to fix a Ford F-150 13th Generation (2015-2020) that stalls when idling

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Clean or Replace the Idle Air Control (IAC) Valve

• Tools Required: Socket set, cleaning solvent, soft brush, torque wrench.
• Sub-steps:
  1. Locate the IAC valve, typically near the throttle body.
  2. Remove any electrical connectors attached to the valve.
  3. Unscrew the mounting bolts and remove the IAC valve.
  4. Clean the valve with solvent and a soft brush, or replace it if damaged.
  5. Reinstall the IAC valve, ensuring it is securely fastened to the throttle body.

3. Inspect and Clean the Throttle Body

• Tools Required: Throttle body cleaner, socket set, soft cloth.
• Sub-steps:
  1. Remove the intake hose connected to the throttle body.
  2. Use throttle body cleaner to thoroughly clean the inside of the throttle body.
  3. Wipe away excess cleaner with a soft cloth.
  4. Reattach the intake hose securely.

4. Check and Repair Vacuum Leaks

• Tools Required: Smoke machine (if available), vacuum gauge.
• Sub-steps:
  1. Inspect all vacuum lines for cracks or disconnections.
  2. Use a smoke machine to detect leaks or spray soapy water on lines while the engine is running.
  3. Replace any damaged vacuum lines.
  4. Ensure all connections are tight and secure.

5. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge to the test port.
  2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure reading.
  3. Compare the reading to manufacturer specifications (typically around 30-50 PSI).
  4. If pressure is low, inspect the fuel pump and fuel filter for issues.