how to diagnose P0301 misfire code in Ford Mustang S650 (2024-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench
• Remove the engine cover if necessary.
• Use a socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of damage or fouling.
• If damaged, replace with a new spark plug (consult manufacturer specifications for the correct type).
• Torque the new spark plug to the manufacturer’s specifications, typically around 13-15 lb-ft.

3. Test and Replace Ignition Coil

• Tools Required: Multimeter, socket set
• Disconnect the ignition coil connector.
• Use a multimeter to test the primary and secondary resistance of the ignition coil.
• If the ignition coil is faulty, replace it with a new one compatible with the vehicle model.
• Reconnect the ignition coil and ensure it is seated properly.

4. Check Fuel Injector

• Tools Required: Fuel injector tester, safety glasses
• Disconnect the fuel injector connector.
• Use a noid light or fuel injector tester to check if voltage is reaching the injector.
• If no voltage is present, trace back to the wiring harness for faults.
• If the injector is faulty, replace it with a new injector.

5. Perform Compression Test

• Tools Required: Compression gauge
• Remove the spark plug from cylinder 1.
• Insert the compression gauge into the spark plug hole.
• Crank the engine a few times and read the compression value.
• If the compression is below the manufacturer’s specifications, further investigation on engine internals may be required.