how to troubleshoot my Ford F-150 13th Generation (2015-2020) that won’t start after rain

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

558 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 troubleshoot and fix a no-start condition after rain in Ford F-150 2015-2020. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow engine to cool before opening the hood and inspecting components.

Symptoms

•Engine cranks but does not start
•Check engine light illuminated
•Unusual noises from the starter or fuel pump
•Water accumulation in the engine bay or under the hood
•Dampness or corrosion in electrical connectors
•Possible odor of fuel or gasoline if flooding occurs

Diagnostic Steps

1
Inspect the battery terminals for corrosion or loose connections.
2
Scan for error codes using an OBD-II scanner to identify any fault codes.
3
Check the fuel pump operation by listening for the pump priming when the ignition is turned on.
4
Examine the fuse box for any blown fuses related to ignition or fuel system.
5
Inspect the air intake system for water ingress or blockage.
6
Verify spark plug condition and ignition coil functionality by testing for spark.

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
•Socket set
•Wire brush
•Multimeter
•Fuel pressure gauge
•Torque wrench

Parts Required

•Fuel pump relay (if necessary)
•Fuel filter (if necessary)
•Spark plugs (if worn)

Related Faults

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Diagnostic Steps

1
Inspect the battery terminals for corrosion or loose connections.
2
Scan for error codes using an OBD-II scanner to identify any fault codes.
3
Check the fuel pump operation by listening for the pump priming when the ignition is turned on.
4
Examine the fuse box for any blown fuses related to ignition or fuel system.
5
Inspect the air intake system for water ingress or blockage.
6
Verify spark plug condition and ignition coil functionality by testing for spark.

Solution

1. Preparation

Gather tools and parts required for troubleshooting.
Disconnect the negative battery terminal to prevent electrical shorts.
Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect Battery and Connections

Sub-steps:
- Use a socket set to remove the battery terminals.
- Clean any corrosion from the terminals and battery posts using a wire brush.
- Reconnect the terminals, ensuring they are tight and secure.

3. Check Fuel System

Sub-steps:
- Locate the fuel pump relay in the fuse box and replace it if faulty.
- Use a fuel pressure gauge to check if the fuel pressure is within specifications (typically 30-40 PSI for F-150).
- If low pressure is detected, inspect the fuel filter for clogs and replace if necessary.

4. Inspect Electrical Components

Sub-steps:
- Visually inspect all electrical connectors for signs of moisture or corrosion.
- Use a multimeter to check for continuity in the ignition circuit and replace any faulty wires or connectors.
- Apply dielectric grease to connectors to prevent future moisture infiltration.

5. Check Spark Plugs and Ignition Coils

Sub-steps:
- Remove spark plugs using a spark plug socket and inspect for wear or fouling.
- Test ignition coils with a multimeter; replace any that are outside specifications.
- Reinstall spark plugs with the correct torque (typically 12-15 lb-ft).