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

515 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 how to diagnose and fix starting issues in Ford F-150 (2015-2020) when hot. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow engine to cool before opening any components to avoid burns.

Symptoms

•Engine cranks but does not start
•Engine stalling after starting
•Rough idle after starting
•Increased cranking time when attempting to start
•Occasional check engine light illumination

Diagnostic Steps

1
Scan the vehicle's onboard computer using an OBD-II scanner for any error codes.
2
Check the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
3
Inspect the battery voltage and health, especially after the engine has been running.
4
Examine the ignition system components, including spark plugs, coils, and wiring for wear or failure.
5
Test the coolant temperature sensor for proper operation and output.
6
Inspect the fuel injectors for proper function and potential leakage.

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 pump (if required)
•Ignition coils (if required)
•Spark plugs (if required)
•Coolant temperature sensor (if required)

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Diagnostic Steps

1
Scan the vehicle's onboard computer using an OBD-II scanner for any error codes.
2
Check the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
3
Inspect the battery voltage and health, especially after the engine has been running.
4
Examine the ignition system components, including spark plugs, coils, and wiring for wear or failure.
5
Test the coolant temperature sensor for proper operation and output.
6
Inspect the fuel injectors for proper function and potential leakage.

Solution

1. Preparation

Gather all necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is turned off.
Disconnect the battery to prevent any electrical shorts during repairs.

2. Fuel System Inspection

Sub-step 1: Remove the fuel pressure gauge's Schrader valve cap and attach the gauge.
Sub-step 2: Turn the ignition on (without starting the engine) to check the fuel pressure reading.
Sub-step 3: If the pressure is low, check the fuel pump relay and fuse for functionality.
Sub-step 4: If both are operational, replace the fuel pump if necessary.

3. Ignition System Check

Sub-step 1: Remove the ignition coil(s) and inspect for cracks or damage.
Sub-step 2: Test each coil with an ohmmeter to ensure they are within manufacturer specifications.
Sub-step 3: Replace any faulty ignition coils or spark plugs as needed.

4. Coolant Temperature Sensor Replacement

Sub-step 1: Locate the coolant temperature sensor; it is usually near the thermostat housing.
Sub-step 2: Disconnect the electrical connector and remove the sensor using a socket wrench.
Sub-step 3: Install the new sensor, ensuring a proper seal with thread sealant if needed.
Sub-step 4: Reconnect the electrical connector.

5. Reconnect Battery

Reconnect the battery terminal, ensuring it is secure and free from corrosion.