my Ford Mustang S550 (2015-2023) has a check engine light and is misfiring

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Replace Spark Plugs

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connectors and remove the coils by unbolting them.
3. Use a spark plug socket to remove old spark plugs.
4. Check the gap on new spark plugs; adjust to manufacturer specifications.
5. Install new spark plugs and torque to manufacturer specifications (typically 13-15 lb-ft).
6. Reinstall the ignition coils and reconnect the connectors.

3. Inspect and Replace Ignition Coils (if necessary)

1. Perform a visual inspection of the ignition coils for cracks or carbon tracking.
2. If any coils are faulty, replace them by unbolting and disconnecting the electrical connectors.
3. Install new ignition coils and ensure they are properly seated.

4. Check and Clean Fuel Injectors

1. If fuel injectors are suspected to be faulty, remove them from the fuel rail.
2. Clean injectors using a professional cleaning kit or replace them if they are clogged or damaged.
3. Reinstall the fuel injectors and ensure proper sealing.

5. Final Assembly and Testing

1. Reconnect the battery terminal.
2. Start the engine and allow it to reach operating temperature.
3. Monitor engine performance and check for any remaining codes with the OBD-II scanner.