why does my Ford F-150 12th Generation (2009-2014) check engine light keep flashing

Solution

1. Preparation

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

2. Inspect and Replace Ignition Components

• Spark Plugs:

  • Remove the spark plug wire or coil pack.
  • Use a spark plug socket to remove the spark plugs.
  • Inspect for wear; replace if worn or fouled.
  • Install new spark plugs to the manufacturer’s specified torque (typically 15-20 ft-lbs).

• Ignition Coils:

  • Disconnect the electrical connector from the ignition coil.
  • Remove the mounting bolts using a socket set.
  • Replace with new ignition coils and secure with the bolts to the manufacturer’s specifications.

3. Fuel System Inspection

• Fuel Pressure Check:

  • Attach a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "On" position without starting the engine and check pressure.
  • Compare the reading to manufacturer specifications (typically 30-50 psi).
  • If low, inspect the fuel pump and filter.

• Fuel Injector Cleaning/Replacement:

  • Remove the fuel rail as per the service manual.
  • Clean or replace clogged fuel injectors as necessary.
  • Reassemble the fuel rail ensuring proper seal and torque.

4. Air Intake Inspection

• Inspect air intake hoses and connections for cracks or leaks.
• Replace any damaged hoses.
• Clean the throttle body as needed using throttle body cleaner.

5. Compression Test

• Remove spark plugs and insert a compression tester into the spark plug holes.
• Crank the engine and record the pressure readings.
• Compare to manufacturer specifications; if readings are low, further investigation is needed for internal engine issues.