why does my Ford F-150 13th Generation (2015-2020) engine misfire when accelerating

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

583 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 engine misfire during acceleration in Ford F-150 13th Generation (2015-2020). Step-by-step guide with diagnostic procedures.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the hood or working on engine components.

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Engine stalling intermittently
•Increased fuel consumption
•Unusual engine noises (e.g., popping or backfiring)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific misfire codes.
2
Inspect the spark plugs for wear or damage, and check the spark plug wires for any signs of arcing or corrosion.
3
Check the fuel pressure using a fuel pressure gauge to ensure proper fuel delivery.
4
Inspect the air intake system for leaks or obstructions that might affect air flow.
5
Examine the ignition coils for proper function and signs of failure.
6
Conduct a compression test on the engine cylinders to check for mechanical issues.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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
•Spark plug socket
•Torque wrench
•Ratchet
•Socket set
•Fuel pressure gauge
•Basic hand tools

Parts Required

•Spark plugs
•Ignition coils (if needed)
•Fuel filter (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific misfire codes.
2
Inspect the spark plugs for wear or damage, and check the spark plug wires for any signs of arcing or corrosion.
3
Check the fuel pressure using a fuel pressure gauge to ensure proper fuel delivery.
4
Inspect the air intake system for leaks or obstructions that might affect air flow.
5
Examine the ignition coils for proper function and signs of failure.
6
Conduct a compression test on the engine cylinders to check for mechanical issues.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to ensure safety.
Allow the engine to cool down before starting work.

2. Replace Spark Plugs

Tools Required: Spark plug socket, torque wrench, ratchet.
Remove the engine cover if necessary.
Disconnect the ignition coil connectors.
Remove the ignition coils and set them aside.
Use the spark plug socket to remove the old spark plugs.
Inspect and clean the spark plug holes to remove debris.
Install new spark plugs, ensuring they are gapped correctly as per manufacturer specifications (typically around 0.054 inches for the F-150).
Torque the spark plugs to the manufacturer's specified value (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coils

Tools Required: Ratchet, socket set.
If any ignition coils were identified as faulty, remove them by unbolting and disconnecting the electrical connectors.
Install new ignition coils, ensuring they are seated properly.
Reconnect the electrical connectors.

4. Check Fuel Pressure

Tools Required: Fuel pressure gauge.
Locate the fuel rail test port and connect the fuel pressure gauge.
Turn the ignition to the "ON" position (do not start the engine) to check the fuel pressure.
If the pressure is below the recommended specification, inspect the fuel pump and fuel filter for issues.

5. Inspect Air Intake and Vacuum Lines

Tools Required: Basic hand tools.
Visually inspect the air intake hose for cracks or leaks.
Check all vacuum lines for signs of wear or disconnection.
Replace any damaged hoses as necessary.