my Ford F-150 13th Generation (2015-2020) gets bad gas mileage what should I check

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

661 words

Problem Statement

Learn how to diagnose and fix poor fuel economy issues in Ford F-150 13th Generation (2015-2020). 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 systems.
•Allow the engine to cool before opening the oil drain plug or working on exhaust components.

Symptoms

•Check engine light illuminated
•Rough idle
•Decreased acceleration performance
•Frequent need to refuel
•Poor performance under load
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any potential malfunctions.
2
Check tire pressure and tread condition, ensuring they meet manufacturer specifications.
3
Inspect air filter for cleanliness; replace if clogged or dirty.
4
Examine fuel system components, including fuel injectors and fuel filter for blockages or leaks.
5
Verify the condition of the spark plugs; replace if worn or fouled.
6
Assess engine oil quality and level; replace if old or low.
7
Check for any exhaust leaks that may affect air-fuel mixture.

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
•Spark plug socket
•Oil filter wrench
•Torque wrench

Parts Required

•Air filter
•Fuel filter
•Spark plugs
•Engine oil
•Oil filter

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any potential malfunctions.
2
Check tire pressure and tread condition, ensuring they meet manufacturer specifications.
3
Inspect air filter for cleanliness; replace if clogged or dirty.
4
Examine fuel system components, including fuel injectors and fuel filter for blockages or leaks.
5
Verify the condition of the spark plugs; replace if worn or fouled.
6
Assess engine oil quality and level; replace if old or low.
7
Check for any exhaust leaks that may affect air-fuel mixture.

Solution

1. Preparation

Gather tools and parts before starting the repair.
Ensure the vehicle is parked on a level surface and the engine is cool.
Disconnect the battery to ensure safety while working on electrical components.

2. Tire Pressure Adjustment

Use a tire pressure gauge to check all four tires.
Adjust the tire pressure to the manufacturer's recommended level (found in the owner's manual or on the door jamb).
Inspect tires for uneven wear that may require rotation or alignment.

3. Air Filter Replacement

Locate the air filter housing and remove the screws or clips holding it in place.
Take out the old air filter and inspect it for dirt and debris.
Insert a new air filter, ensuring it fits snugly, and reassemble the housing.

4. Fuel System Inspection

Remove the fuel filter (if applicable) and replace it with a new one.
Inspect fuel injectors for clogs using a fuel injector cleaning kit or have them professionally cleaned.
Check fuel lines for any cracks or leaks; replace if necessary.

5. Spark Plug Replacement

Remove the spark plug wires or coils carefully.
Using a spark plug socket, remove the old spark plugs and inspect for wear or deposits.
Install new spark plugs with the recommended gap and torque them to the specified value (usually around 12-15 ft-lbs, but refer to the service manual).

6. Engine Oil Change

Drain the old engine oil by removing the oil drain plug and allow it to fully drain.
Replace the oil filter using an oil filter wrench.
Reinstall the drain plug with a new washer and torque it to the manufacturer's specifications.
Refill the engine with the recommended oil type and quantity.

7. Exhaust Leak Check

Inspect the exhaust system visually for any signs of wear, cracks, or holes.
Use a smoke test or a simple visual inspection to find leaks.
Repair or replace damaged sections of the exhaust system as needed.