my Ford Explorer Fifth Generation (2011-2019) has a hard time starting when cold

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

617 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 (2011-2019). Step-by-step guide with symptoms, diagnostic steps, 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 performing any maintenance tasks.

Symptoms

•Engine cranks but does not start
•Extended cranking time before engine starts
•Rough idle after starting
•Check engine light may be illuminated
•Decreased fuel efficiency
•Unusual engine noises during cranking

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the battery voltage and condition; ensure terminals are clean and secure.
3
Check the fuel pressure with a fuel pressure gauge to verify that the fuel pump is operating correctly.
4
Examine the ignition system components (spark plugs, ignition coils) for wear or damage.
5
Test the coolant temperature sensor to ensure it is providing accurate readings to the ECU.
6
Inspect the air intake system for any leaks or blockages.

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
•Multimeter
•Fuel pressure gauge
•Socket set
•Spark plug socket
•Pliers

Parts Required

•New battery (if necessary)
•Fuel pump (if necessary)
•Spark plugs
•Ignition coils (if necessary)
•Coolant temperature sensor (if necessary)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the battery voltage and condition; ensure terminals are clean and secure.
3
Check the fuel pressure with a fuel pressure gauge to verify that the fuel pump is operating correctly.
4
Examine the ignition system components (spark plugs, ignition coils) for wear or damage.
5
Test the coolant temperature sensor to ensure it is providing accurate readings to the ECU.
6
Inspect the air intake system for any leaks or blockages.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to avoid electrical shorts.
Allow the engine to cool if it has been running.

2. Battery Inspection and Replacement

Tools Required: Multimeter, socket set
Check the battery voltage with a multimeter; it should read above 12.6 volts when fully charged.
If the voltage is low, replace the battery.
- Remove the negative terminal first, followed by the positive.
- Replace the old battery with a new one, connecting the positive terminal first, then the negative.

3. Fuel System Check

Tools Required: Fuel pressure gauge, socket set
Connect the fuel pressure gauge to the fuel rail test port.
Turn the ignition to the "On" position (do not start) to check the fuel pressure; it should be within the manufacturer's specifications (typically around 50-60 psi for many vehicles).
If pressure is low, inspect and replace the fuel pump if necessary.
- Remove the fuel pump access panel (if applicable) or lower the fuel tank.
- Disconnect the electrical connector and fuel lines, then replace the pump.

4. Ignition System Maintenance

Tools Required: Socket set, spark plug socket
Remove the spark plugs and inspect for wear; replace if damaged or fouled.
Check ignition coils for proper operation using a multimeter; replace any faulty coils.
- To replace coils, disconnect the electrical connector and remove the bolts securing the coil, then replace.

5. Coolant Temperature Sensor Replacement

Tools Required: Socket set, pliers
Locate the coolant temperature sensor on the engine.
Disconnect the electrical connector and unscrew the sensor using the socket set.
Install the new sensor, ensuring a proper seal with thread sealant if required, and reconnect the connector.