why does my Ford F-150 12th Generation (2009-2014) have a rough start after sitting

Solution

1. Preparation

• Gather tools and parts required.
• Ensure the vehicle is parked on a level surface.
• Disconnect the battery before beginning work.

2. Check and Replace the Battery (if needed)

• Sub-steps:
  1. Use a multimeter to measure the battery voltage; it should be at least 12.6 volts.
  2. If the voltage is low, charge the battery or replace it if it won't hold a charge.
  3. Reconnect the battery.

3. Inspect and Replace Fuel Filter

• Sub-steps:
  1. Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  2. Locate the fuel filter; it is typically along the fuel line under the vehicle.
  3. Use line wrenches to disconnect the fuel lines from the filter.
  4. Remove the old filter and install the new one, ensuring the correct orientation.
  5. Reconnect the fuel lines and restore fuel pressure.

4. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the ignition coil or spark plug wire to access the spark plugs.
  2. Use a spark plug socket and ratchet to remove the old spark plugs.
  3. Inspect for wear and replace with new spark plugs as necessary (refer to manufacturer specifications for gap setting).
  4. Reinstall the ignition coils or spark plug wires.

5. Inspect Air Intake System

• Sub-steps:
  1. Remove the air intake duct to access the throttle body.
  2. Inspect the air filter; replace if dirty.
  3. Clean the throttle body with throttle body cleaner and a soft cloth.
  4. Reassemble the air intake system.