what to do if my Ford F-150 has a P0302 misfire code?

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, torque wrench, multimeter, compression gauge, and a noid light.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Ignition Components

1. Disconnect the negative battery terminal to prevent electrical shorts.
2. Remove the engine cover if applicable.
3. Locate the ignition coil for cylinder 2 and disconnect the electrical connector.
4. Unbolt and remove the ignition coil from the spark plug.
5. Inspect the spark plug for wear or damage. If necessary, replace it with a new one (ensure it's gapped to manufacturer specifications).
6. Reinstall the ignition coil and reconnect the electrical connector.
7. Reconnect the negative battery terminal.

3. Test and Replace Fuel Injector

1. Remove the fuel injector connector for cylinder 2.
2. Use a noid light to check for injector pulse when the engine is cranked.
3. If no pulse is detected, inspect wiring and connectors for damage. If the wiring is intact, replace the fuel injector.
4. To replace the injector, relieve fuel system pressure, remove the fuel rail, and extract the old injector. Install the new one and reassemble the fuel rail.

4. Compression Test on Cylinder 2

1. Remove the spark plug from cylinder 2.
2. Insert the compression gauge into the spark plug hole.
3. Crank the engine for a few seconds and record the compression reading.
4. If the reading is below the manufacturer’s specified range, further investigation into mechanical issues (e.g., valve problems, head gasket) may be necessary.