why does my Ford F-150 13th Generation (2015-2020) have poor fuel economy

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

591 words

Problem Statement

Discover how to diagnose and resolve poor fuel economy issues in Ford F-150 13th Generation (2015-2020). Step-by-step guide with 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 components.
•Allow the engine to cool before inspecting or working on the exhaust system.

Symptoms

•Check engine light illuminated
•Decreased miles per gallon (MPG)
•Engine stalling or misfiring
•Rough idle
•Increased emissions
•Unusual engine noises (e.g., knocking or pinging)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any active trouble codes.
2
Inspect the air filter for clogs or excessive dirt and replace if necessary.
3
Check fuel pressure using a fuel pressure gauge to ensure the fuel system is operating correctly.
4
Inspect and test spark plugs for wear or fouling, replacing any that are damaged.
5
Examine exhaust system components for blockages or leaks.
6
Assess tire pressure and condition; ensure they are inflated to manufacturer specifications.

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
•Torque wrench
•Socket set
•Screwdriver
•Ratchet

Parts Required

•Air filter
•Spark plugs
•Fuel filter (if needed)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any active trouble codes.
2
Inspect the air filter for clogs or excessive dirt and replace if necessary.
3
Check fuel pressure using a fuel pressure gauge to ensure the fuel system is operating correctly.
4
Inspect and test spark plugs for wear or fouling, replacing any that are damaged.
5
Examine exhaust system components for blockages or leaks.
6
Assess tire pressure and condition; ensure they are inflated to manufacturer specifications.

Solution

1. Preparation

Gather all necessary tools and parts.
Park the vehicle on a flat surface and engage the parking brake.
Disconnect the negative battery terminal to ensure safety.

2. Replace Air Filter

Locate the air filter housing.
Open the housing by unclipping or unscrewing the lid.
Remove the old air filter and clean the housing with a damp cloth.
Insert the new air filter, ensuring it fits snugly, then reassemble the housing.
Tools required: Screwdriver or socket set.

3. Replace Spark Plugs

Remove the ignition coil cover if applicable.
Disconnect the electrical connector from each ignition coil.
Unbolt the ignition coils and remove them.
Use a spark plug socket to remove old spark plugs.
Install new spark plugs, hand-tighten, and then torque to manufacturer specifications (typically 12-15 lb-ft).
Reinstall the ignition coils and reconnect electrical connectors.
Tools required: Torque wrench, spark plug socket, ratchet.

4. Check Fuel System

Connect a fuel pressure gauge to the fuel rail.
Turn the ignition to the "On" position without starting the engine and check the pressure reading against manufacturer specifications (usually between 30-50 psi).
If pressure is low, inspect the fuel pump and fuel filter for issues. Replace the fuel filter if it is clogged or dirty.
Tools required: Fuel pressure gauge.

5. Inspect Exhaust System

Visually inspect the exhaust system for any visible leaks or damage.
Use a smoke machine or soapy water to check for leaks.
Repair or replace any damaged sections of the exhaust system.
Tools required: Wrenches, socket set, exhaust pipe cutter (if needed).