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

550 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 misfires 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 engine to cool before opening any components.
•Use caution when handling fuel lines to prevent leaks and fire hazards.

Symptoms

•Check engine light illuminated
•Rough idle, especially when in gear
•Loss of power during acceleration
•Engine shaking or vibrating
•Increased fuel consumption
•Unusual exhaust emissions or smell

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify misfire codes.
2
Inspect ignition components, including spark plugs and ignition coils for wear or damage.
3
Check fuel system pressure using a fuel pressure gauge to ensure adequate fuel delivery.
4
Examine the air intake system for blockages or vacuum leaks.
5
Test the engine compression to assess the health of the cylinders.
6
Review engine coolant temperature sensor readings to ensure proper operation.

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
•Socket set
•Ratchet
•Spark plug socket
•Fuel pressure gauge

Parts Required

•OEM spark plugs
•Ignition coils (if needed)
•Fuel injectors (if needed)
•Intake manifold gasket (if removing manifold)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify misfire codes.
2
Inspect ignition components, including spark plugs and ignition coils for wear or damage.
3
Check fuel system pressure using a fuel pressure gauge to ensure adequate fuel delivery.
4
Examine the air intake system for blockages or vacuum leaks.
5
Test the engine compression to assess the health of the cylinders.
6
Review engine coolant temperature sensor readings to ensure proper operation.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to prevent electrical shorts.
Allow the engine to cool completely before beginning work.

2. Replace Spark Plugs

Remove the engine cover (if applicable) using a socket set.
Locate the spark plugs; remove ignition coils by unscrewing retaining bolts.
Use a spark plug socket and ratchet to carefully remove the old spark plugs.
Inspect the old spark plugs for wear; replace with new OEM spark plugs, ensuring they are gapped correctly per specifications.
Reinstall ignition coils and secure them in place.

3. Inspect and Replace Ignition Coils (if necessary)

If misfire codes indicate faulty ignition coils, remove the ignition coils by unscrewing the retaining bolts.
Install new ignition coils and ensure they are seated properly.
Reconnect the wiring harness to the ignition coils.

4. Check and Replace Fuel Injectors (if necessary)

If fuel delivery issues are suspected, remove the intake manifold to access fuel injectors.
Disconnect fuel lines and electrical connectors from the injectors.
Remove old fuel injectors and replace them with new ones, ensuring O-rings are lubricated.
Reinstall the intake manifold and reconnect fuel lines.

5. Final Assembly

Reconnect the battery.
Start the engine and allow it to idle.
Ensure all components are secured and there are no leaks.