how to diagnose a fuel economy drop in my Ford Explorer

Ford Explorer Fifth Generation (2011-2019)

Error Codes

3-5 hours

Time

medium

Difficulty

medium

Severity

3 min read

543 words

Problem Statement

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

Affected Component

Fuel System

Estimated Time

3-5 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow engine to cool before working on intake or fuel systems.

Symptoms

•Check engine light illuminated
•Decreased miles per gallon (MPG)
•Rough engine idle
•Unusual engine noises
•Increased emissions from exhaust
•Fuel odor near the vehicle

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any underlying issues.
2
Check the tire pressure to ensure they are inflated to the manufacturer's specifications.
3
Inspect the air filter for clogs or dirt that could restrict airflow.
4
Examine the fuel system for leaks or blockages, including fuel injectors.
5
Test the fuel pressure to verify that it meets manufacturer's specifications.
6
Evaluate the engine oil condition and level; change if dirty or low.
7
Inspect the mass airflow sensor (MAF) and throttle body for cleanliness and 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
•Tire pressure gauge
•Socket set
•Fuel injector cleaning kit
•MAF sensor cleaner
•Screwdriver set

Parts Required

•New air filter
•Fuel injector O-rings (if needed)
•Fuel injector cleaning solvent

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any underlying issues.
2
Check the tire pressure to ensure they are inflated to the manufacturer's specifications.
3
Inspect the air filter for clogs or dirt that could restrict airflow.
4
Examine the fuel system for leaks or blockages, including fuel injectors.
5
Test the fuel pressure to verify that it meets manufacturer's specifications.
6
Evaluate the engine oil condition and level; change if dirty or low.
7
Inspect the mass airflow sensor (MAF) and throttle body for cleanliness and proper function.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to ensure safety.
Allow the vehicle to cool down if the engine was running.

2. Replace Air Filter

Locate the air filter housing.
Remove the screws or clips holding the cover in place.
Take out the old air filter and clean the housing.
Install the new air filter ensuring it is seated properly.
Reattach the cover and secure it with screws or clips.

3. Clean Fuel Injectors

Remove the fuel injectors as per the vehicle's service manual.
Use a fuel injector cleaning kit or solvent to clean each injector thoroughly.
Check and replace any O-rings on the injectors before reinstallation.
Reinstall the injectors and ensure they are properly secured.

4. Inspect and Clean MAF Sensor

Locate the MAF sensor in the intake system.
Disconnect the electrical connector and remove the sensor from its housing.
Spray MAF sensor cleaner onto the sensor element, avoiding contact with the wiring.
Allow it to dry completely before reinstalling.

5. Check Tire Pressure

Use a tire pressure gauge to check each tire's pressure.
Inflate tires to the recommended PSI listed on the driver's side door jamb.
Inspect for uneven wear or damage and rotate tires if necessary.