how to diagnose P0302 misfire code on my Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Inspect Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil and inspect for cracks or damage.
• Check the spark plug for wear or fouling; replace if necessary.
• Reinstall the ignition coil and tighten to manufacturer specifications (typically 7-10 Nm).

3. Fuel Injector Inspection

• Tools Required: Noid light or multimeter.
• Disconnect the fuel injector connector for cylinder 2.
• Connect a noid light to the injector harness and crank the engine; the light should flash if the injector is receiving a signal.
• If no signal, check wiring continuity and connections.
• If the injector is faulty, replace it with a new one and ensure proper installation.

4. Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine and note the compression reading; it should be within the manufacturer's specified range (typically 120-180 psi).
• If compression is low, further investigate potential internal engine issues.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses leading to and from the intake manifold.
• Use a smoke machine or spray a small amount of carburetor cleaner around the intake to detect leaks.
• Repair or replace any damaged hoses or gaskets.