why does my Ford Explorer get poor fuel economy during city driving

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix poor fuel economy in Ford Explorer during city driving. 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 components.
•Allow the engine to cool before performing any inspections or repairs.

Symptoms

•Check engine light illuminated
•Decreased miles per gallon (MPG) readings
•Rough idle or stalling during stops
•Increased frequency of refueling
•Unusual engine noises during acceleration
•Smell of fuel or exhaust fumes

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify potential faults.
2
Check tire pressure and condition; low pressure can affect fuel economy.
3
Inspect the air filter for cleanliness and proper airflow.
4
Measure fuel pressure to ensure the fuel delivery system is functioning correctly.
5
Examine the fuel injectors for clogs or leaks.
6
Verify the operation of the oxygen sensors and mass air flow (MAF) sensor.

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
•Oxygen sensor socket
•Fuel injector cleaning kit

Parts Required

•Air filter
•Oxygen sensors
•Fuel injector cleaning solution

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify potential faults.
2
Check tire pressure and condition; low pressure can affect fuel economy.
3
Inspect the air filter for cleanliness and proper airflow.
4
Measure fuel pressure to ensure the fuel delivery system is functioning correctly.
5
Examine the fuel injectors for clogs or leaks.
6
Verify the operation of the oxygen sensors and mass air flow (MAF) sensor.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a flat surface and the engine is cool.
Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Air Filter

Locate the air filter housing and remove the cover.
Take out the old air filter and inspect for dirt or blockages.
Install a new air filter, ensuring it fits snugly in the housing.
Reattach the cover and secure it properly.

3. Clean Fuel Injectors

Obtain a fuel injector cleaning kit or professional cleaning service.
If using a cleaning kit, follow the manufacturer’s instructions to connect it to the fuel system.
Run the engine to allow the cleaner to flow through the injectors.
Turn off the engine and disconnect the cleaning kit; check for leaks.

4. Replace Oxygen Sensors

Locate the upstream and downstream oxygen sensors.
Disconnect the wiring harness from each sensor.
Use an oxygen sensor socket to remove the old sensors.
Install the new oxygen sensors and reconnect the wiring harness.
Ensure they are tightened to the manufacturer’s specifications.

5. Tire Maintenance

Check tire pressure with a gauge; inflate to the recommended PSI.
Inspect the tread depth and condition; replace tires if necessary.
Rotate tires if uneven wear is observed to ensure balanced performance.