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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid electrical shorts.
• Allow the engine to cool before beginning work.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Socket set, torque wrench, ratchet, spark plug socket.
• Remove the engine cover (if applicable) to access the ignition coil.
• Disconnect the wiring harness from the ignition coil.
• Remove the ignition coil mounting bolts and take out the coil.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the old spark plug for wear or damage; replace it if necessary.
• Install the new spark plug by hand to avoid cross-threading, then torque to manufacturer specifications (typically around 13-15 lb-ft).
• Reinstall the ignition coil, securing it with bolts and reconnecting the wiring harness.

3. Test Fuel Injector

• Tools Required: Noid light or injector tester.
• Disconnect the fuel injector connector from cylinder 1.
• Connect the noid light to the fuel injector connector and crank the engine.
• Observe the noid light; it should flash, indicating proper signal from the ECU.
• If the noid light does not flash, consider testing the wiring or replacing the injector.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Install the compression tester into the spark plug hole.
• Crank the engine several times and record the compression reading.
• Compare the result to manufacturer's specifications (typically around 150-200 psi).
• If compression is low, further investigate cylinder head gasket, valves, or piston issues.