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Home/Cars/Ford/F-150/14th Generation (2021-2024)/how to fix P0302 misfire code in Ford F-150 14th Generation (2021-2024)

how to fix P0302 misfire code in Ford F-150 14th Generation (2021-2024)

Ford F-150 14th Generation (2021-2024)

Severity: highDifficulty: mediumError Code: P03022-4 hours
4 min read
671 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0302 cylinder 2 misfire in Ford F-150 14th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0302
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Relieve fuel system pressure before servicing fuel injectors.

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Loss of power during acceleration
  • •Decreased fuel economy
  • •Engine stalling
  • •Increased exhaust emissions

Diagnostic Steps

  1. 1Scan the vehicle's computer using an OBD-II scanner to confirm the P0302 code and check for any additional trouble codes.
  2. 2Inspect the spark plug in cylinder 2 for wear or damage; replace if necessary.
  3. 3Check the ignition coil for cylinder 2 by swapping it with another cylinder and see if the misfire moves.
  4. 4Inspect the fuel injector for cylinder 2; check for clogs or electrical issues.
  5. 5Perform a compression test on cylinder 2 to determine if there are any internal engine issues.
  6. 6Check for vacuum leaks around the intake manifold and vacuum hoses.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Replace Spark Plug

  • Tools Required: Socket set, spark plug socket, torque wrench.
  • Remove the engine cover if applicable.
  • Locate cylinder 2 spark plug (consult service manual for exact location).
  • Using the spark plug socket, remove the old spark plug.
  • Inspect the spark plug for damage or excessive wear.
  • Install a new spark plug, ensuring it is gapped correctly (usually around 0.030-0.035 inches).
  • Torque the spark plug to the manufacturer's specifications (typically around 13-15 ft-lbs).

3. Replace Ignition Coil (if needed)

  • Tools Required: Socket set, torque wrench.
  • Remove the bolt securing the ignition coil for cylinder 2.
  • Gently pull the ignition coil straight out of the spark plug well.
  • Install the new ignition coil by aligning it with the spark plug and pushing it down firmly.
  • Reinstall the securing bolt and tighten to the manufacturer's specifications.

4. Inspect/Replace Fuel Injector (if needed)

  • Tools Required: Fuel injector removal tool, socket set.
  • Relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
  • Disconnect the electrical connector from the fuel injector for cylinder 2.
  • Remove the fuel rail bolts and gently pull the fuel rail away.
  • Remove the fuel injector by pulling it out of the rail.
  • Inspect or replace the fuel injector if it shows signs of clogging or damage.
  • Reinstall the fuel injector and fuel rail, ensuring all connections are secure.

5. Compression Test (if misfire persists)

  • Tools Required: Compression tester.
  • Remove spark plugs from all cylinders for accurate testing.
  • Insert the compression tester into the spark plug hole of cylinder 2.
  • Crank the engine and record the compression reading.
  • Compare the reading to specifications (typically around 120-150 psi); low compression indicates internal engine issues.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Socket set
  • Torque wrench
  • Spark plug socket
  • Fuel injector removal tool
  • Compression tester

Parts Required

  • Spark plug (for cylinder 2)
  • Ignition coil (if necessary)
  • Fuel injector (if necessary)

Additional Information

Error CodeP0302
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

6 items

Parts

3 items

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