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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before proceeding.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1 by taking off the mounting bolts.
• Carefully pull out the spark plug using the spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage. Replace if necessary.
• Install a new spark plug and torque it to the manufacturer’s specification (typically around 13-15 lb-ft).

3. Check and Replace Ignition Coil

• Inspect the ignition coil for cracks or damage.
• Remove the ignition coil from cylinder 1 if faulty.
• Install a new ignition coil ensuring it sits properly on the spark plug.
• Reconnect the wiring harness to the ignition coil.

4. Fuel System Check

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "on" position without starting the engine to check pressure.
• If pressure is below specification, check the fuel pump and fuel filter for issues. Replace as necessary.

5. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole and crank the engine several times.
• Note the compression reading; it should be within the manufacturer's specification. If low, further investigation of cylinder health is needed.