how to fix engine misfire on Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

628 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 (2011-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the negative battery terminal before working on electrical systems.
•Allow the engine to cool before opening the hood to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle at stop lights
•Decreased acceleration or power
•Increased fuel consumption
•Engine stalling intermittently
•Unusual engine noises (e.g., backfiring)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific misfire codes.
2
Inspect spark plugs for wear and carbon buildup.
3
Check ignition coils for proper operation and any visible damage.
4
Test fuel injectors for clogs or malfunctions.
5
Inspect vacuum hoses for leaks or cracks.
6
Verify fuel pressure with a fuel pressure gauge to ensure proper delivery.

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
•Torque wrench
•Spark plug gap tool
•Fuel pressure gauge
•Fuel injector cleaner kit

Parts Required

•Spark plugs
•Ignition coils
•Fuel injectors (if needed)
•Vacuum hoses (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 spark plugs for wear and carbon buildup.
3
Check ignition coils for proper operation and any visible damage.
4
Test fuel injectors for clogs or malfunctions.
5
Inspect vacuum hoses for leaks or cracks.
6
Verify fuel pressure with a fuel pressure gauge to ensure proper delivery.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shorts.
Allow the engine to cool down before starting work.

2. Replace Spark Plugs

Tools Required: Socket set, torque wrench, spark plug gap tool
Remove the ignition coil(s) by unscrewing the bolts and gently pulling them out from the spark plug.
Use a socket and ratchet to remove the spark plugs. Inspect the old plugs for signs of wear or damage.
Install new spark plugs, ensuring they are gapped according to manufacturer specifications (typically between 0.028-0.032 inches for this model).
Torque the new spark plugs to 13 lb-ft (18 Nm).

3. Replace Ignition Coils

Tools Required: Socket set
Remove the old ignition coils from the spark plugs by unscrewing the mounting bolts.
Install new ignition coils onto each spark plug, ensuring a proper fit.
Reattach the electrical connectors securely to each ignition coil.

4. Clean or Replace Fuel Injectors

Tools Required: Fuel injector cleaner kit or replacement injectors
If cleaning, attach the fuel injector cleaner kit to the fuel rail and follow the manufacturer's instructions.
If replacing, disconnect fuel lines and electrical connectors from the old injectors.
Remove the old injectors, lubricate the O-rings of the new injectors with engine oil, and install them in the fuel rail.
Reconnect fuel lines and electrical connectors securely.

5. Inspect Vacuum Hoses

Visually inspect all vacuum hoses for cracks or disconnections.
Replace any damaged hoses with new ones, ensuring a tight fit to prevent vacuum leaks.

6. Verify Fuel Pressure

Tools Required: Fuel pressure gauge
Attach the fuel pressure gauge to the fuel rail.
Turn the ignition to the "On" position without starting the engine to check the fuel pressure. It should be within manufacturer specifications (typically around 55-65 psi).
If the pressure is low, further investigate the fuel pump or fuel filter.