why does my Ford Explorer have poor fuel economy all of a sudden

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

636 words

Problem Statement

Learn how to diagnose and fix poor fuel economy issues in Ford Explorer. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Fuel System

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 inspecting the fuel system to prevent burns.

Symptoms

•Check engine light illuminated
•Decreased miles per gallon (MPG) reading
•Engine stalling or rough idling
•Increased exhaust emissions
•Unusual fuel odors
•Reduced power during acceleration

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any potential issues.
2
Check and record current fuel trims using the scanner for indications of rich or lean conditions.
3
Inspect the air filter for blockages or excessive dirtiness that may restrict airflow.
4
Examine the fuel system, including checking fuel pressure and inspecting for leaks.
5
Assess the condition of the spark plugs and ignition system for wear or performance issues.
6
Verify the operation of the oxygen sensors and mass airflow sensor (MAF) for proper function.

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
•Flathead screwdriver
•Spark plug socket
•Ratchet
•Torque wrench
•Fuel pressure gauge
•O2 sensor socket

Parts Required

•Air filter
•Spark plugs
•Oxygen sensors (if needed)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any potential issues.
2
Check and record current fuel trims using the scanner for indications of rich or lean conditions.
3
Inspect the air filter for blockages or excessive dirtiness that may restrict airflow.
4
Examine the fuel system, including checking fuel pressure and inspecting for leaks.
5
Assess the condition of the spark plugs and ignition system for wear or performance issues.
6
Verify the operation of the oxygen sensors and mass airflow sensor (MAF) for proper function.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a flat, stable surface and engage the parking brake.

2. Replace Air Filter

Sub-steps:
1. Open the hood and locate the air filter housing.
2. Unclip or unscrew the housing cover and remove the old air filter.
3. Clean any debris from the housing with a soft cloth.
4. Install the new air filter, ensuring it fits snugly.
5. Reattach the housing cover securely.
Tools Required: Flathead screwdriver (if applicable)

3. Inspect and Replace Spark Plugs

Sub-steps:
1. Remove the engine cover (if applicable) to access the spark plugs.
2. Disconnect the ignition coil connectors and remove the coils.
3. Use a spark plug socket to unscrew and remove the old spark plugs.
4. Inspect the spark plugs for wear and replace them with new ones if necessary.
5. Reinstall the ignition coils and reattach the connectors.
Tools Required: Spark plug socket, ratchet, torque wrench
Torque Specification: Tighten spark plugs to manufacturer specifications (typically 13-15 ft-lbs).

4. Test Fuel System Pressure

Sub-steps:
1. Locate the fuel pressure test port on the fuel rail.
2. Connect the fuel pressure gauge to the test port.
3. Turn the ignition to the "ON" position (do not start the engine) and read the fuel pressure.
4. Compare the reading to the manufacturer's specifications. If low, check the fuel pump and filter.
Tools Required: Fuel pressure gauge

5. Inspect and Replace Oxygen Sensors

Sub-steps:
1. Identify the location of the upstream and downstream oxygen sensors using the vehicle's service manual.
2. Disconnect the electrical connectors from the sensors.
3. Use an O2 sensor socket to remove the faulty sensors.
4. Install new sensors and reconnect the electrical connectors.
Tools Required: O2 sensor socket, ratchet