why does my Ford F-150 13th Generation (2015-2020) have a hard time starting when hot?

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

589 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn to diagnose and fix hot starting issues in Ford F-150 (2015-2020). Step-by-step guide with symptoms, diagnostic steps, 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 performing repairs to avoid burns.

Symptoms

•Engine cranks but does not start when hot
•Extended cranking time before engine starts
•Potential backfiring during starting attempts
•Check engine light illuminated intermittently
•Reduced engine performance or rough idle after starting
•Fuel smell around the engine compartment

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes related to the starting issue.
2
Inspect the fuel pressure using a fuel pressure gauge to ensure the fuel system is delivering adequate pressure when the engine is hot.
3
Check the functionality of the ignition coil(s) and spark plugs under hot conditions.
4
Measure the resistance of the engine coolant temperature (ECT) sensor to determine if it’s providing accurate readings.
5
Inspect the fuel injectors for proper operation and any signs of blockage or leakage.
6
Test the battery voltage and condition to ensure it is sufficient for hot starting.

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
•Multimeter
•Socket set
•Torque wrench

Parts Required

•Fuel filter (if applicable)
•Ignition coils (if faulty)
•ECT sensor (if faulty)
•Fuel injectors (if clogged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes related to the starting issue.
2
Inspect the fuel pressure using a fuel pressure gauge to ensure the fuel system is delivering adequate pressure when the engine is hot.
3
Check the functionality of the ignition coil(s) and spark plugs under hot conditions.
4
Measure the resistance of the engine coolant temperature (ECT) sensor to determine if it’s providing accurate readings.
5
Inspect the fuel injectors for proper operation and any signs of blockage or leakage.
6
Test the battery voltage and condition to ensure it is sufficient for hot starting.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is cool before beginning work to avoid burns.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect the Fuel System

Sub-steps:
1. Reconnect the fuel pressure gauge to the fuel rail.
2. Start the engine and observe the fuel pressure reading; it should meet specifications (typically 30-45 PSI depending on engine variant).
3. If pressure is low, check the fuel pump relay and fuel filter for blockages or failures.

3. Test the Ignition System

Sub-steps:
1. Remove the ignition coil from each cylinder and inspect for cracks or corrosion.
2. Test each coil's resistance using a multimeter to ensure it falls within manufacturer specifications (usually around 0.5–1.5 ohms for primary circuit).
3. Replace any faulty ignition coils as needed.

4. Check the Engine Coolant Temperature (ECT) Sensor

Sub-steps:
1. Locate the ECT sensor and disconnect its electrical connector.
2. Use a multimeter to measure the resistance of the sensor at various temperature points.
3. Compare the readings to the manufacturer's chart; replace the sensor if readings are out of range.

5. Inspect and Clean Fuel Injectors

Sub-steps:
1. Remove the fuel injectors from the fuel rail.
2. Clean the injectors using a specialized cleaning kit or replace if clogged.
3. Reinstall the injectors and ensure all connections are secure.