why does my Ford Mustang S550 (2015-2023) fuel economy suddenly drop

Solution

1. Preparation

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

2. Inspect and Replace Fuel Filter

• Sub-steps:
  1. Locate the fuel filter, typically found along the fuel line.
  2. Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
  3. Disconnect the fuel lines from the filter using the appropriate line removal tool.
  4. Remove the old filter and install the new one, ensuring the flow direction matches the markings.
  5. Reconnect the fuel lines and replace the fuel pump fuse.

3. Clean or Replace Air Filter

• Sub-steps:
  1. Locate the air filter housing and open it.
  2. Remove the old air filter.
  3. Clean the housing with a dry cloth.
  4. Install a new air filter, ensuring it fits snugly in place.

4. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the ignition coil by unscrewing the retaining bolts and disconnecting the electrical connector.
  2. Use a spark plug socket to remove the spark plugs.
  3. Inspect the old plugs for wear; replace with new ones if necessary, ensuring to gap them to manufacturer specifications.
  4. Reinstall the ignition coils and reconnect electrical connectors.

5. Clean Fuel Injectors

• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Use a fuel injector cleaning kit or a professional cleaning service to remove carbon deposits.
  3. Reinstall the cleaned or new injectors, ensuring proper sealing and alignment.