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

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the engine cover if applicable.
• Disconnect the ignition coil harness and remove the ignition coil using the socket set.
• Remove the spark plug using the spark plug socket and inspect it for wear or damage.
• Replace the spark plug with a new one, ensuring it is gapped correctly according to manufacturer specifications (usually around 0.028-0.032 inches).
• Reinstall the ignition coil and reconnect the harness.

3. Inspect and Replace Ignition Coil (if necessary)

• If the ignition coil shows signs of damage or if the spark plug replacement does not resolve the issue, proceed to replace the ignition coil.
• Tools Required: Socket set.
• Remove the faulty ignition coil and replace it with a new one, ensuring it is seated properly.
• Reconnect the ignition coil harness.

4. Check Fuel Injector Operation

• Tools Required: Fuel pressure gauge, multimeter.
• Connect the fuel pressure gauge to the fuel rail and check for proper fuel pressure according to the specifications (usually 40-60 psi).
• If fuel pressure is low, inspect the fuel pump and filter for issues.
• If pressure is adequate, use a multimeter to check the injector's electrical resistance. Replace the injector if it is faulty.

5. Conduct a Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1 and screw in the compression tester.
• Crank the engine and record the compression reading. Compare it to manufacturer specifications (typically around 150-200 psi).
• If the compression is low, further diagnose potential valve or piston ring issues.