What are the symptoms of a failing ignition coil in a 2020 Ford Explorer?

Ford Explorer Sixth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

730 words

Problem Statement

Learn about the symptoms of a failing ignition coil in a 2020 Ford Explorer, diagnostic steps, and repair instructions to resolve the issue.

Affected Component

ignition coil

Estimated Time

1-2 hours

Symptoms

•Engine Misfires
•Rough Idle
•Decreased Fuel Efficiency
•Check Engine Light
•Hard Starting or No Start
•Backfiring

Diagnostic Steps

1
Initial Inspection
2
Scan for Codes
3
Perform Ignition Coil Test
4
Check Spark Output

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
•Multimeter
•Ignition Coil Tester
•Basic Hand Tools
•Safety Glasses and Gloves

Related Faults

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Solution

1. Engine Misfires

Description: You may feel the engine hesitate, stumble, or hesitate during acceleration, which is often accompanied by a noticeable loss of power.
Cause: This occurs because the ignition coil is not providing sufficient voltage to ignite the air-fuel mixture in the cylinder.

2. Rough Idle

Description: The engine may run unevenly while idling, leading to vibrations or a shaking sensation.
Cause: An inconsistent spark can lead to incomplete combustion, resulting in a rough idle.

3. Decreased Fuel Efficiency

Description: A noticeable decline in fuel efficiency can occur as the engine struggles to maintain performance.
Cause: Misfiring leads to poor combustion, causing the engine to work harder and consume more fuel.

4. Check Engine Light

Description: The Check Engine Light (CEL) may illuminate on the dashboard.
Cause: The vehicle’s onboard diagnostics may detect irregularities in the ignition system and trigger a fault code related to the ignition coil.

5. Hard Starting or No Start

Description: The engine may be difficult to start or may fail to start altogether.
Cause: If the coil is not supplying adequate spark, the engine may not ignite the air-fuel mixture.

6. Backfiring

Description: You may hear popping sounds from the exhaust or intake, indicating backfiring.
Cause: An ignition coil that is malfunctioning can result in a timing issue with the spark, causing backfiring.

Tools Required

OBD-II Scanner
Multimeter (for resistance testing)
Ignition Coil Tester (if available)
Basic Hand Tools (screwdriver set, socket set)
Safety Glasses and Gloves

Step 1: Initial Inspection

Visual Check: Open the hood and inspect the ignition coil for any obvious signs of damage, corrosion, or loose connections.
Check Wiring: Ensure that all electrical connectors and wiring to the ignition coil are intact and not damaged.

Step 2: Scan for Codes

Connect OBD-II Scanner: Plug the scanner into the OBD-II port (usually located under the dashboard).
Read Codes: Retrieve any trouble codes that may indicate issues with the ignition system. Common codes may include P0300 (random/multiple cylinder misfire) or specific codes like P0301 (cylinder 1 misfire).

Step 3: Perform Ignition Coil Test

Remove the Ignition Coil: Disconnect the electrical connector and remove the bolts securing the ignition coil to the engine.
Resistance Test:
- Set the multimeter to the ohms setting.
- Measure the primary resistance across the coil terminals (typically between 0.5 - 2 ohms).
- Measure the secondary resistance from the terminal to the high-voltage output (typically between 6,000 - 15,000 ohms).
- Compare results with manufacturer specifications.

Step 4: Check Spark Output

Use an Ignition Coil Tester: If available, connect the ignition coil tester to the ignition coil and crank the engine. Observe if a strong spark is produced.
No Spark Test: If there is no spark, the coil may be failing.

Repair Instructions

Step 1: Replacing the Ignition Coil

Purchase New Ignition Coil: Ensure you have the correct part number for the replacement coil.
Install New Coil:
- Position the new coil in place and secure it with the bolts.
- Reconnect the electrical harness to the ignition coil.
Reconnect Battery: Ensure the battery is reconnected safely.

Step 2: Test the Repair

Start the Engine: Turn the ignition key and allow the engine to start.
Monitor Performance: Check for smooth idling, acceleration, and ensure the Check Engine Light is off.
Check for Codes Again: Use the OBD-II scanner to ensure no codes are present.

Step 3: Final Inspection

Road Test: Take the vehicle for a short drive to ensure that all symptoms have been resolved.
Double-check Connections: After the test, recheck all connections and ensure everything is secure.

By following these steps, you can effectively diagnose and repair issues related to a failing ignition coil in a 2020 Ford Explorer. If problems persist after replacement, further investigation into the ignition system or related components may be necessary.