why does my Ford Explorer's check engine light flash when accelerating

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

589 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 a flashing check engine light during acceleration in Ford Explorer. 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 electrical systems.
•Relieve fuel pressure before disconnecting fuel lines.

Symptoms

•Check engine light illuminated and flashing
•Noticeable engine vibration or shaking
•Loss of power during acceleration
•Rough idle when at a stop
•Poor fuel economy
•Unusual exhaust smoke

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific issues.
2
Inspect spark plugs and ignition coils for wear or damage.
3
Check fuel injector operation and for any clogs.
4
Examine vacuum lines for leaks that may affect engine performance.
5
Test the fuel pressure to ensure the fuel system is functioning properly.
6
Inspect the exhaust system for obstructions 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
•Socket set
•Multimeter
•Fuel pressure gauge

Parts Required

•Spark plugs
•Ignition coils (if faulty)
•Fuel injectors (if faulty)
•Vacuum hoses (if damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific issues.
2
Inspect spark plugs and ignition coils for wear or damage.
3
Check fuel injector operation and for any clogs.
4
Examine vacuum lines for leaks that may affect engine performance.
5
Test the fuel pressure to ensure the fuel system is functioning properly.
6
Inspect the exhaust system for obstructions or leaks.

Solution

1. Preparation

Tools Required: OBD-II scanner, socket set, multimeter, fuel pressure gauge.
Disconnect the battery to prevent electrical shorts.
Ensure the vehicle is on a flat surface and securely lifted if necessary.

2. Inspect and Replace Spark Plugs

Sub-steps:
1. Remove the ignition coil cover if applicable.
2. Disconnect the electrical connectors from the ignition coils.
3. Remove the bolts securing the ignition coils and lift them out.
4. Use a spark plug socket to remove the old spark plugs.
5. Inspect the spark plugs for wear; replace if damaged or fouled.
6. Install new spark plugs, ensuring they are gapped correctly (typically 0.054 inches for Ford engines).
7. Reinstall the ignition coils and secure them with bolts.

3. Check and Replace Fuel Injectors

Sub-steps:
1. Relieve fuel system pressure by removing the fuel pump relay and starting the engine until it stalls.
2. Disconnect the fuel lines and electrical connectors from the fuel injectors.
3. Remove the fuel rail bolts and carefully lift the fuel rail with injectors attached.
4. Inspect the fuel injectors for clogs and replace any that are faulty.
5. Reinstall the fuel rail, ensuring all connections are secure, and reconnect the fuel lines.

4. Examine and Repair Vacuum Leaks

Sub-steps:
1. Visually inspect all vacuum hoses for cracks or disconnections.
2. Use a smoke machine or carburetor cleaner to locate leaks.
3. Replace any damaged vacuum hoses.
4. Ensure all connections are tight and secure.

5. Verify Fuel Pressure

Sub-steps:
1. Connect a fuel pressure gauge to the fuel rail service port.
2. Turn the ignition to the "ON" position without starting the engine and check the pressure.
3. Compare the reading to manufacturer specifications (usually between 30-50 psi).
4. If pressure is low, consider checking the fuel pump and filter.