why does my Ford Mustang S650 (2024-Present) keep throwing P0301 misfire code

Solution

1. Preparation

• Gather necessary tools and parts before starting the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Ignition Components

• Spark Plug Replacement:

  • Remove the engine cover if applicable.
  • Disconnect the ignition coil connector for cylinder 1.
  • Remove the ignition coil using a socket set (typically 10mm).
  • Remove the spark plug using a spark plug socket, clean any debris from the area before removal.
  • Inspect the old spark plug for signs of wear (carbon build-up, damage).
  • Install a new spark plug with the correct gap (consult owner's manual for specifications) and torque to manufacturer specifications (usually around 13-15 lb-ft).
  • Reinstall the ignition coil and connector.

• Ignition Coil Replacement (if needed):

  • If the ignition coil shows signs of damage or wear, replace it with a new unit.
  • Ensure the new coil matches the specifications in the owner’s manual.

3. Fuel Injector Testing and Replacement (if necessary)

• Fuel Injector Inspection:
  • Connect a fuel pressure gauge to the fuel rail to ensure proper fuel pressure.
  • Remove the fuel injector connector and perform a resistance test; it should match the specifications (usually around 12-15 ohms).
  • If the fuel injector is faulty, remove it using a suitable tool and replace it with a new injector.

4. Compression Test

• Perform a compression test on cylinder 1:
  • Remove the spark plug for cylinder 1.
  • Insert a compression gauge into the spark plug hole.
  • Crank the engine for several revolutions and record the compression reading. It should meet manufacturer specifications (consult the service manual).
  • If compression is low, further engine diagnostics may be needed.

5. Inspect for Vacuum Leaks

• Use a smoke machine or carburetor cleaner to check for vacuum leaks around the intake manifold and hoses.
• Repair or replace any damaged hoses or gaskets.