how to diagnose bad spark plugs in Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

501 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 bad spark plugs 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 battery before working on electrical systems.
•Allow the engine to cool before removing spark plugs to prevent burns.

Symptoms

•Check engine light illuminated
•Rough idle
•Engine misfire during acceleration
•Poor fuel economy
•Difficulty starting the engine
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify misfire codes.
2
Inspect the spark plug wires or ignition coils for visible damage or wear.
3
Remove the spark plugs and visually inspect them for wear, carbon buildup, or damage.
4
Measure the spark plug gap with a feeler gauge to ensure it is within specifications.
5
Perform a spark test using a spark plug tester to check for consistent spark production.
6
Check the engine compression using a compression gauge if misfires persist after spark plug inspection.

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
•Feeler gauge
•Spark plug tester
•Compression gauge

Parts Required

•Spark plugs (OEM or quality aftermarket)
•Spark plug wires or ignition coils (if damaged)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify misfire codes.
2
Inspect the spark plug wires or ignition coils for visible damage or wear.
3
Remove the spark plugs and visually inspect them for wear, carbon buildup, or damage.
4
Measure the spark plug gap with a feeler gauge to ensure it is within specifications.
5
Perform a spark test using a spark plug tester to check for consistent spark production.
6
Check the engine compression using a compression gauge if misfires persist after spark plug inspection.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, torque wrench, feeler gauge, spark plug tester, compression gauge.
Disconnect the negative battery terminal to ensure safety while working on the ignition system.

2. Remove Spark Plugs

Use a socket wrench with the correct size socket to loosen and remove each spark plug.
Take care to keep track of which spark plug comes from which cylinder.

3. Inspect and Clean

Inspect each spark plug for signs of wear, such as corrosion, carbon deposits, or physical damage.
Clean any carbon buildup with a wire brush or replace if excessively worn.
Check the spark plug gap using a feeler gauge and adjust or replace as necessary.

4. Replace Spark Plugs

If any spark plugs are found to be faulty, replace them with OEM or quality aftermarket spark plugs.
Ensure the new spark plugs are gapped correctly according to manufacturer specifications (typically around 0.044 inches for the Ford Explorer).
Install the new spark plugs and torque them to the manufacturer-recommended specification (usually around 13-15 lb-ft).

5. Reconnect and Test

Reconnect the battery terminal.
Start the engine and allow it to idle, checking for smooth operation and absence of misfiring.