how to diagnose a rough running engine on Ford F-150 Fourteenth Generation (2021-present)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Replace Spark Plugs and Ignition Coils

• Tools Required: Socket set, torque wrench, dielectric grease.
• Remove the engine cover if necessary to access the ignition components.
• Disconnect the electrical connectors from the ignition coils.
• Unscrew the ignition coils and remove them from the spark plug wells.
• Remove the old spark plugs using a socket wrench.
• Install new spark plugs, torquing them to manufacturer specifications (usually around 13-15 lb-ft).
• Apply dielectric grease to the terminals of the new ignition coils.
• Reinstall the ignition coils and reconnect the electrical connectors.

3. Inspect and Replace Fuel Filter (if applicable)

• Tools Required: Fuel line disconnect tool, socket set.
• Locate the fuel filter in the fuel line.
• Relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the fuel lines using the fuel line disconnect tool.
• Remove the old fuel filter and install the new one, ensuring proper orientation.
• Reconnect the fuel lines and reinstall the fuel pump fuse.

4. Clean MAF Sensor

• Tools Required: MAF sensor cleaner spray.
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake duct.
• Spray the MAF sensor with the cleaner and let it dry completely before reinstalling.