my Ford Explorer has poor gas mileage what could be causing it

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

607 words

Problem Statement

Discover how to diagnose and fix poor gas mileage issues in your Ford Explorer. Step-by-step guide with symptoms, diagnostic steps, and solutions.

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 opening the oil drain plug.

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Decreased fuel efficiency
•Unusual fuel odors
•Increased emissions from the exhaust

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes related to fuel system issues.
2
Check the fuel pressure with a fuel pressure gauge to ensure the fuel pump is functioning correctly.
3
Inspect the air filter for clogs or dirt that could restrict airflow to the engine.
4
Examine the fuel injectors for proper operation and possible leaks.
5
Evaluate tire pressure and condition, as under-inflated tires can contribute to poor fuel economy.
6
Assess engine oil levels and quality to determine if an oil change is needed.

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
•Fuel pressure gauge
•Tire pressure gauge
•Socket set
•Oil catch pan
•Wrench set

Parts Required

•Air filter
•Fuel injectors (if necessary)
•Engine oil
•Oil filter

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any fault codes related to fuel system issues.
2
Check the fuel pressure with a fuel pressure gauge to ensure the fuel pump is functioning correctly.
3
Inspect the air filter for clogs or dirt that could restrict airflow to the engine.
4
Examine the fuel injectors for proper operation and possible leaks.
5
Evaluate tire pressure and condition, as under-inflated tires can contribute to poor fuel economy.
6
Assess engine oil levels and quality to determine if an oil change is needed.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is turned off.
Disconnect the battery to ensure safety when working on electrical components.

2. Replace Air Filter

Locate the air filter housing, usually near the engine.
Remove the screws or clips securing the air filter cover.
Take out the old air filter and replace it with a new one.
Reattach the air filter cover and secure it.

3. Clean or Replace Fuel Injectors

If using a fuel injector cleaner, add it to the fuel tank according to the manufacturer's instructions and run the engine for a few minutes.
For direct cleaning or replacement:
- Disconnect the fuel line and any electrical connectors from the injectors.
- Remove the fuel rail bolts and carefully lift it off the injectors.
- Replace old injectors with new ones, ensuring proper alignment.
- Reassemble the fuel rail and reconnect all lines and connectors.

4. Check and Inflate Tires

Use a tire pressure gauge to check the pressure of each tire.
Inflate tires to the manufacturer-recommended PSI level, found on the driver’s door jamb or in the owner’s manual.
Inspect tires for excessive wear or damage and replace if necessary.

5. Change Engine Oil

Drain old engine oil using an oil catch pan.
Replace the oil filter with a new one.
Refill the engine with the manufacturer-recommended oil type and quantity.
Run the engine for a few minutes and check for leaks.