how to fix the P0301 misfire code on my Ford Mustang S650 (2024-Present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, dielectric grease.
• Sub-steps:
  1. Remove the engine cover (if applicable) using the socket set.
  2. Disconnect the electrical connector from the ignition coil for cylinder 1.
  3. Remove the ignition coil by unscrewing the retaining bolt and gently pulling it out.
  4. Remove the spark plug using a spark plug socket; inspect it for wear.
  5. Install the new spark plug to the manufacturer's specified torque (typically around 13-15 lb-ft).
  6. Apply dielectric grease to the inside of the ignition coil boot and install the new ignition coil, securing it with the bolt.
  7. Reconnect the electrical connector to the ignition coil.

3. Test Fuel Injector

• Tools Required: Fuel pressure gauge (if necessary).
• Sub-steps:
  1. Disconnect the fuel injector connector for cylinder 1.
  2. Use a multimeter to check the injector's resistance; compare it to specifications (usually around 12-16 ohms).
  3. If the injector is faulty, remove it and replace it with a new one, ensuring proper sealing.
  4. Reconnect the injector and its electrical connector.

4. Check Compression

• Tools Required: Compression tester.
• Sub-steps:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine for a few seconds to obtain a reading.
  4. If the compression is low (below manufacturer's specifications), further diagnostic may be needed (valve issues, head gasket failure).