why is my Ford Explorer Fifth Generation (2011-2019) engine misfiring

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

544 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 battery before working on electrical components.
•Allow engine to cool completely before performing any inspections or repairs.

Symptoms

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

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific cylinder misfire codes.
2
Inspect the ignition system, including spark plugs, ignition coils, and wiring for damage or wear.
3
Check fuel delivery by testing fuel pressure with a fuel pressure gauge.
4
Inspect the air intake system for blockages or vacuum leaks.
5
Test the engine compression to check for mechanical issues.
6
Verify that the engine coolant temperature sensor is functioning properly.

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
•Fuel pressure gauge
•Basic hand tools (sockets, wrenches)

Parts Required

•Spark plugs
•Ignition coils (if faulty)
•Fuel filter (if necessary)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific cylinder misfire codes.
2
Inspect the ignition system, including spark plugs, ignition coils, and wiring for damage or wear.
3
Check fuel delivery by testing fuel pressure with a fuel pressure gauge.
4
Inspect the air intake system for blockages or vacuum leaks.
5
Test the engine compression to check for mechanical issues.
6
Verify that the engine coolant temperature sensor is functioning properly.

Solution

1. Preparation

Gather tools and parts needed for repair.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Spark Plugs

Sub-steps:
- Remove the ignition coil(s) by unscrewing and gently pulling them off the spark plugs.
- Use a spark plug socket to remove old spark plugs.
- Inspect the spark plugs for wear or fouling; replace them if necessary.
- Install new spark plugs, torquing them to the manufacturer's specification (typically around 13-15 lb-ft).
- Reattach the ignition coils.

3. Check and Replace Ignition Coils

Sub-steps:
- If misfiring persists after spark plug replacement, test ignition coils using a multimeter.
- Remove any faulty ignition coils and replace them with new ones.
- Ensure proper seating and connections of the new coils.

4. Fuel System Inspection

Sub-steps:
- Connect a fuel pressure gauge to the fuel rail and turn the ignition to the "On" position without starting the engine.
- Check fuel pressure against specifications; it should typically be around 55-65 psi.
- If pressure is low, check the fuel filter and fuel pump for blockages or failures and replace if necessary.

5. Air Intake System Check

Sub-steps:
- Inspect the air filter for dirt; replace if clogged.
- Check intake hoses and connections for leaks; replace any damaged hoses.
- Ensure the Mass Air Flow (MAF) sensor is clean and functioning.