why does my Ford Explorer Fifth Generation (2011-2019) sound like it's misfiring

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

488 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 issues in Ford Explorer Fifth Generation (2011-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on the ignition system.
•Relieve fuel pressure before disconnecting fuel lines to avoid fuel spray.

Symptoms

•Engine runs roughly or unevenly
•Check engine light illuminated
•Loss of power during acceleration
•Increased fuel consumption
•Engine stalling or hesitation
•Unusual noises from the engine (e.g., popping or backfiring)

Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics (OBD-II) for error codes.
2
Inspect spark plugs for wear or damage.
3
Check ignition coils for proper function.
4
Examine fuel injectors for clogs or leaks.
5
Test compression in each cylinder to identify potential mechanical issues.
6
Inspect the air intake system for blockages or leaks.

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
•Multimeter
•Compression gauge
•Fuel injector cleaning kit

Parts Required

•New spark plugs
•Ignition coils (if needed)
•Fuel injectors (if needed)

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Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics (OBD-II) for error codes.
2
Inspect spark plugs for wear or damage.
3
Check ignition coils for proper function.
4
Examine fuel injectors for clogs or leaks.
5
Test compression in each cylinder to identify potential mechanical issues.
6
Inspect the air intake system for blockages or leaks.

Solution

1. Preparation

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

2. Inspect and Replace Spark Plugs

Sub-steps:
1. Remove the engine cover if necessary.
2. Disconnect the ignition coil connectors.
3. Unscrew and remove the spark plugs using a spark plug socket.
4. Inspect the old spark plugs for wear or fouling.
5. Install new spark plugs, ensuring the gap is set according to manufacturer specifications (typically around 0.044 inches for the Ford Explorer).
6. Reconnect the ignition coils and replace the engine cover.

3. Test and Replace Ignition Coils

Sub-steps:
1. Remove the ignition coils by unscrewing the mounting bolts.
2. Inspect each coil for cracks or damage.
3. Test each coil with a multimeter to ensure they are within the specified resistance range (typically 0.5-1.5 ohms).
4. Replace any faulty ignition coils with new ones.
5. Reinstall ignition coils and secure them properly.

4. Check and Clean Fuel Injectors

Sub-steps:
1. Disconnect the fuel supply line and relieve fuel pressure.
2. Remove the fuel rail with the injectors attached.
3. Inspect injectors for clogs or leaks; clean them using a fuel injector cleaning kit if necessary.
4. Reinstall the fuel rail and reconnect the fuel line.
5. Prime the system by turning the key to the ON position without starting the engine, then check for fuel leaks.

5. Compression Test

Sub-steps:
1. Remove all spark plugs for easier access to cylinders.
2. Connect the compression gauge to the first cylinder and crank the engine.
3. Record the compression reading and repeat for all cylinders.
4. Compare readings; if any cylinder shows significantly lower compression, further investigation is needed (potential valve or head gasket issues).

Tools Required:

OBD-II scanner
Spark plug socket
Torque wrench
Multimeter
Compression gauge
Fuel injector cleaning kit

Parts Required:

New spark plugs
Ignition coils (if needed)
Fuel injectors (if needed)

Estimated Repair Time: 2-4 hours

Safety Warnings:

Disconnect the battery before working on the ignition system.
Relieve fuel pressure before disconnecting fuel lines to avoid fuel spray.