my Ford Explorer won't start when it's cold, what's wrong?

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

553 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 cold start issues in Ford Explorer. 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 the battery before working on electrical systems.
•Allow the engine to cool before inspecting or servicing the fuel system.

Symptoms

•Engine cranks but does not start
•Difficulty starting after prolonged cold periods
•Check engine light may be illuminated
•Rough idle after starting
•Increased emissions upon start-up

Diagnostic Steps

1
Scan the vehicle for error codes using an OBD-II scanner to identify potential faults.
2
Inspect the battery voltage and connections for corrosion or looseness.
3
Check the fuel pump operation by listening for the pump activation sound when turning the ignition key.
4
Test the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
5
Inspect the ignition system components, including spark plugs, ignition coils, and wires for wear or damage.

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
•Fuel pressure gauge
•Multimeter

Parts Required

•New battery (if necessary)
•New fuel pump (if necessary)
•New spark plugs (if necessary)
•New ignition coils (if necessary)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan the vehicle for error codes using an OBD-II scanner to identify potential faults.
2
Inspect the battery voltage and connections for corrosion or looseness.
3
Check the fuel pump operation by listening for the pump activation sound when turning the ignition key.
4
Test the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
5
Inspect the ignition system components, including spark plugs, ignition coils, and wires for wear or damage.

Solution

1. Preparation

Gather all necessary tools and parts before starting the repair.
Make sure the vehicle is in a well-ventilated area and the parking brake is engaged.

2. Battery Inspection and Replacement

Sub-steps:
1. Disconnect the negative battery terminal to ensure safety.
2. Remove the battery from the vehicle using a socket set.
3. Clean the battery terminals with a wire brush to remove corrosion.
4. If the battery voltage is below 12.4 volts, replace the battery with a new one.
5. Reinstall the battery and reconnect the terminals, tightening them securely.

3. Fuel Pump Testing and Replacement

Sub-steps:
1. Connect the fuel pressure gauge to the fuel rail's service port.
2. Turn the ignition key to the "On" position (do not start) and check the pressure reading.
3. If the fuel pressure is below specifications (check the service manual for exact values), replace the fuel pump.
4. To replace, remove the rear seat or fuel tank as necessary to access the pump.
5. Disconnect fuel lines and electrical connectors, then remove the pump assembly.
6. Install the new pump, ensuring all connections are secure.

4. Ignition System Inspection and Replacement

Sub-steps:
1. Remove the spark plug wires by pulling them straight out from the ignition coils.
2. Inspect the spark plugs for wear; replace them if they appear worn or fouled.
3. Replace the ignition coils if they show signs of damage or if test measurements indicate failure.
4. Reassemble the ignition wires to their respective positions ensuring a snug fit.