why does my Ford Explorer Fifth Generation (2011-2019) have poor fuel economy?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

616 words

Problem Statement

Discover how to diagnose and fix poor fuel economy issues in Ford Explorer (2011-2019). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Fuel System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems
•Relieve fuel pressure before servicing the fuel system

Symptoms

•Check engine light illuminated
•Decreased miles per gallon (MPG) compared to previous performance
•Increased engine noise or rough idling
•Unusual exhaust emissions or odor
•Loss of power during acceleration
•Fuel odor detected around the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any diagnostic trouble codes (DTCs)
2
Inspect air filter for clogging or dirt that could restrict airflow to the engine
3
Check fuel pressure using a fuel pressure gauge to ensure the fuel pump is delivering the correct amount of fuel
4
Examine tire pressure and condition, ensuring they are at the manufacturer-recommended levels
5
Inspect the exhaust system for leaks or blockages that could affect engine performance
6
Verify proper operation of the mass airflow sensor (MAF) and oxygen sensors

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
•Fuel pressure gauge
•Tire pressure gauge
•O2 sensor socket

Parts Required

•Air filter
•Fuel pump (if needed)
•O2 sensors (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any diagnostic trouble codes (DTCs)
2
Inspect air filter for clogging or dirt that could restrict airflow to the engine
3
Check fuel pressure using a fuel pressure gauge to ensure the fuel pump is delivering the correct amount of fuel
4
Examine tire pressure and condition, ensuring they are at the manufacturer-recommended levels
5
Inspect the exhaust system for leaks or blockages that could affect engine performance
6
Verify proper operation of the mass airflow sensor (MAF) and oxygen sensors

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface with the engine off.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Air Filter

Remove the air intake cover (if applicable) using a socket set.
Take out the old air filter and inspect it for dirt and debris.
Install a new OEM or high-quality air filter.
Reattach the air intake cover and ensure it is secured.

3. Test and Replace Fuel Pump (if needed)

Connect the fuel pressure gauge to the fuel rail test port.
Turn the ignition to the "ON" position (do not start) and check the pressure reading.
If pressure is below specifications, replace the fuel pump.
- Fuel Pump Replacement Steps:
  - Relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls.
  - Disconnect the fuel lines and electrical connectors from the fuel pump.
  - Remove the fuel pump assembly from the fuel tank.
  - Install the new fuel pump assembly and reconnect all lines and connectors.

4. Inspect and Replace Oxygen Sensors (if required)

Locate the upstream and downstream oxygen sensors in the exhaust system.
Using an O2 sensor socket, unscrew the old sensors.
Install the new sensors, ensuring they are torqued to manufacturer specifications.
Reconnect the electrical connectors and clear any codes from the OBD-II scanner.

5. Check and Adjust Tire Pressure

Use a tire pressure gauge to measure the pressure in each tire.
Inflate tires to the recommended pressure found on the driver's door jamb sticker.
Inspect tires for uneven wear or damage and rotate or replace if necessary.