how to fix P0302 misfire in Ford F-150 13th Generation (2015-2020)

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter.
• Parts Required: Spark plug (specific to engine type), ignition coil (if faulty), fuel injector (if clogged/damaged).
• Ensure the engine is cool before beginning work.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Locate cylinder 2 spark plug.
• Sub-steps:
  1. Disconnect the ignition coil connector.
  2. Unscrew the spark plug using the socket set.
  3. Inspect the old spark plug for wear (should be replaced if damaged or worn).
  4. Gap the new spark plug according to manufacturer specifications.
  5. Install the new spark plug and tighten to manufacturer torque specifications (typically around 13 lb-ft).
  6. Reconnect the ignition coil.

3. Test Ignition Coil

• If the spark plug replacement does not resolve the issue, test the ignition coil.
• Sub-steps:
  1. Disconnect the ignition coil connector.
  2. Use a multimeter to check for resistance according to specifications (consult repair manual for resistance values).
  3. If out of spec, replace the ignition coil.
  4. Reconnect the ignition coil and ensure the connection is secure.

4. Inspect Fuel Injectors

• If misfire persists, check fuel injector operation.
• Sub-steps:
  1. Remove the fuel injector connector for cylinder 2.
  2. Use a multimeter to test for voltage supply.
  3. If there's no voltage, trace wiring back to the engine control unit (ECU).
  4. If voltage is present, perform a flow test on the injector using a fuel pressure gauge.
  5. Replace the fuel injector if it is clogged or malfunctioning.