how to diagnose rough idle on Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.

2. Clean or Replace Throttle Body

• Tools Required: Throttle body cleaner, soft cloth, socket set.
• Remove the air intake duct connected to the throttle body.
• Use throttle body cleaner and a soft cloth to clean the throttle plate and surrounding area.
• Reattach the air intake duct securely.

3. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, gap gauge.
• Remove the ignition coils from the spark plugs by unscrewing them.
• Extract the spark plugs using a spark plug socket.
• Inspect the spark plugs for wear and gap. Replace them if they are worn or out of specification.
• Install new spark plugs, ensuring they are torqued to the manufacturer's specifications (typically around 13 lb-ft).

4. Check and Repair Air Intake Leaks

• Tools Required: Vacuum gauge, hose clamps.
• Inspect all intake hoses and connections for cracks or loose fittings.
• Replace any damaged hoses or secure loose connections to prevent vacuum leaks.

5. Test Fuel System

• Tools Required: Fuel pressure gauge.
• Attach the fuel pressure gauge to the fuel rail and turn the ignition on (do not start the engine).
• Check the fuel pressure reading against the specifications (typically 30-40 psi). Replace the fuel filter or pump if the pressure is low.