how to fix Ford F-150 Fourteenth Generation (2021-present) misfires when accelerating

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil connectors by pulling them straight off.
• Unscrew the ignition coils and remove them from the spark plug wells.
• Using a spark plug socket, remove the old spark plugs.
• Check the new spark plugs for proper gap using a feeler gauge; adjust as necessary.
• Install the new spark plugs and torque them to the manufacturer's specification (typically around 13-15 lb-ft).
• Reinstall the ignition coils and reconnect the connectors.

3. Inspect and Replace Ignition Coils (if necessary)

• Remove the ignition coils as described in the previous step.
• Test each coil with a multimeter to ensure proper resistance (consult service manual for specifications).
• If any coils are faulty, replace them with new components.
• Reinstall the ignition coils as previously described.

4. Clean or Replace Fuel Injectors

• Tools Required: Fuel injector cleaning kit or replacement injectors.
• Remove the fuel rail by disconnecting the fuel lines and unbolting it from the intake manifold.
• Remove the fuel injectors from the rail.
• Clean the injectors using a cleaning kit or replace them if they are damaged.
• Reassemble the fuel rail and reconnect the fuel lines securely.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses for cracks or disconnections; replace any damaged hoses.
• If vacuum leaks are present, use a smoke machine to verify leaks in the intake manifold or other areas.

6. Verify Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check the pressure against the manufacturer specifications (usually around 30-55 psi).
• If the pressure is low, inspect the fuel pump and fuel filter for potential issues.