how to diagnose a fuel injector issue in my Ford Mustang S550 (2015-2023)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Relieve fuel system pressure by removing the fuel pump relay and starting the engine until it stalls.

2. Remove Fuel Injectors

• Tools Required: Socket set, fuel line disconnect tool, torque wrench.
• Remove any engine covers or components obstructing access to the fuel rail.
• Disconnect the fuel lines using the fuel line disconnect tool.
• Unplug the electrical connectors from each fuel injector.
• Unbolt and remove the fuel rail, carefully lifting it to avoid damaging the injectors.

3. Inspect and Clean

• Check each injector for dirt, clogs, or physical damage.
• Clean the injectors with a specialized injector cleaning solvent if they are dirty.
• Inspect O-rings for wear and replace if necessary.

4. Replace Injectors (if faulty)

• If testing indicates any injectors are faulty, replace them with new ones.
• Ensure the O-rings are lubricated with clean engine oil before installation to prevent tearing.
• Reinstall the fuel rail, ensuring it seats correctly on the injectors and bolts are torqued to the manufacturer’s specifications.

5. Reconnect and Test

• Reconnect the fuel lines and electrical connectors to the injectors.
• Reinstall any engine covers or components that were removed.
• Reconnect the negative battery terminal and start the engine.
• Check for leaks and ensure the engine runs smoothly.