why is my Ford F-150 getting worse gas mileage lately

Ford F-150 Fourteenth Generation (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

550 words

Problem Statement

Discover how to diagnose and fix fuel efficiency issues in your Ford F-150. 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 battery before working on ignition components.
•Allow the engine to cool before inspecting or working on the fuel system.

Symptoms

•Check engine light illuminated
•Rough idle at stops
•Noticeable decrease in power during acceleration
•Increased exhaust emissions (black smoke)
•Fuel odor near the engine bay
•Engine stalling or hesitation during operation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify potential issues.
2
Check tire pressure and tread depth; ensure they are within manufacturer specifications.
3
Inspect the air filter for clogs or excessive dirt buildup.
4
Examine fuel injectors for proper operation and cleanliness.
5
Test fuel pressure using a fuel pressure gauge to ensure the fuel pump is functioning correctly.
6
Assess the condition of spark plugs and ignition coils for wear or damage.

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 pressure gauge
•Multimeter
•Cleaning supplies (for injectors)

Parts Required

•Air filter
•Fuel injectors (if cleaning or replacement is necessary)
•Spark plugs

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify potential issues.
2
Check tire pressure and tread depth; ensure they are within manufacturer specifications.
3
Inspect the air filter for clogs or excessive dirt buildup.
4
Examine fuel injectors for proper operation and cleanliness.
5
Test fuel pressure using a fuel pressure gauge to ensure the fuel pump is functioning correctly.
6
Assess the condition of spark plugs and ignition coils for wear or damage.

Solution

1. Preparation

Tools Needed: OBD-II scanner, tire pressure gauge, socket set, fuel pressure gauge, multimeter, cleaning supplies (for injectors).
Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Address Diagnostic Codes

Use the OBD-II scanner to read and record any error codes.
Research codes to determine if any relate to fuel system, ignition system, or other components affecting fuel economy.

3. Inspect and Replace Air Filter

Remove the air filter housing cover using a socket set.
Take out the old air filter and inspect it. If dirty or clogged, replace it with a new one.
Reassemble the air filter housing and secure it properly.

4. Clean or Replace Fuel Injectors

Disconnect the fuel pump relay and run the engine until it stalls to relieve fuel pressure.
Remove the fuel rail with injectors attached using a socket set.
Clean the injectors with injector cleaner or replace them if necessary.
Reinstall the fuel rail and reconnect the fuel pump relay.

5. Check and Replace Spark Plugs

Remove the ignition coil covers using a socket set.
Extract the spark plugs using a spark plug socket.
Inspect spark plugs for wear; replace with OEM parts if worn or fouled.
Reinstall ignition coils and covers.

6. Tire Pressure and Alignment Check

Use a tire pressure gauge to check each tire and inflate to the recommended pressure.
If tires are worn or misaligned, have them aligned and rotated if necessary.