why does my Ford Mustang S650 (2024-Present) check engine light flash when accelerating?

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 negative battery terminal to prevent electrical issues.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connectors and remove the ignition coils using a socket.
  3. Inspect spark plugs for wear; replace if they are fouled or worn. Use OEM or recommended spark plugs.
  4. Apply dielectric grease to the ignition coil boots before reinstallation.
  5. Reinstall the ignition coils and reconnect the connectors.

3. Check Fuel System

• Tools Required: Fuel pressure gauge, wrench set.
• Sub-steps:
  1. Locate the fuel pump access (if applicable) or disconnect the fuel line at the fuel rail.
  2. Attach the fuel pressure gauge and turn the ignition on (do not start the engine) to check for proper pressure as specified in the service manual.
  3. If pressure is low, test the fuel pump operation and replace if necessary.
  4. Replace the fuel filter if it shows signs of clogging.

4. Inspect Air Intake and Exhaust Systems

• Tools Required: Screwdrivers, flashlight.
• Sub-steps:
  1. Check the air intake hose for cracks or looseness; replace if damaged.
  2. Inspect the mass airflow sensor for contamination; clean it with MAF cleaner if necessary.
  3. Examine the exhaust system for signs of blockage or damage, such as dents or corrosion.
  4. Ensure the catalytic converter is functioning properly; replace if it is restricted.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any error codes and test drive the vehicle to see if the check engine light remains off.