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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting any work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the ignition coil from cylinder 1.
• Use a spark plug socket to remove the old spark plug.
• Inspect the spark plug hole for debris and clean if necessary.
• Install the new spark plug by hand to avoid cross-threading, then torque to the manufacturer’s specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil and ensure it is seated properly.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set, torque wrench.
• Disconnect the connector from the ignition coil.
• Remove the ignition coil mounting bolts and take out the ignition coil.
• Install the new ignition coil and torque the mounting bolts to the specified values (usually around 7-10 lb-ft).
• Reconnect the ignition coil connector.

4. Check Fuel Delivery

• Tools Required: Fuel pressure gauge, basic hand tools.
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the "ON" position (without starting) and check the pressure reading against manufacturer specifications (typically 30-50 psi).
• If pressure is low, consider replacing the fuel injector for cylinder 1 or the fuel pump, depending on the issue.

5. Check Compression (if misfire persists)

• Tools Required: Compression tester.
• Remove the ignition coil and spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and record the compression reading. Compare it to manufacturer specifications (usually around 150-200 psi).
• If compression is low, further investigation into internal engine components may be needed.