what causes my Ford F-150 to have a check engine light with code P0174

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before working on it.

2. Inspect and Repair Air Intake

• Sub-steps:
  1. Visually inspect the air intake ducting from the air filter to the throttle body for cracks or loose connections.
  2. If any leaks are found, replace the damaged sections of the ducting.
  3. Reconnect any hoses that may be disconnected.
• Tools Required: Socket set, screwdrivers.

3. Fuel Pressure Check

• Sub-steps:
  1. Locate the fuel rail pressure test port.
  2. Attach the fuel pressure gauge to the test port and turn the ignition to the "On" position (do not start the engine).
  3. Check the pressure reading against manufacturer specifications; replace the fuel pump or filter if pressure is low.
• Tools Required: Fuel pressure gauge.

4. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector and remove the sensor from the air intake.
  2. Clean the MAF sensor using MAF cleaner; allow it to dry completely.
  3. Reinstall the MAF sensor and reconnect the connector.
• Tools Required: MAF cleaner, Torx or socket set.

5. Inspect Exhaust System

• Sub-steps:
  1. Visually examine the exhaust pipes for any holes or rust that could cause leaks.
  2. Tighten any loose connections or replace damaged sections of the exhaust.
  3. Pay special attention to the area around the oxygen sensors.
• Tools Required: Wrench set, socket set.

6. Fuel Injector Inspection

• Sub-steps:
  1. Remove the fuel injectors from the engine.
  2. Perform a flow test on each injector to ensure they are supplying the correct amount of fuel.
  3. Replace any injectors that do not meet specifications.
• Tools Required: Injector cleaning kit, flow testing equipment.