how to fix Ford Explorer Fifth Generation (2011-2019) rough idle when cold

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

611 words

Problem Statement

Learn how to diagnose and fix rough idle issues in Ford Explorer Fifth Generation (2011-2019). Step-by-step guide with 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 the engine to cool before working on the cooling system.

Symptoms

•Check engine light illuminated
•Rough idle upon initial start-up
•Engine stalling shortly after starting
•Increased emissions during cold start
•Poor fuel economy during cold operation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Check the engine coolant temperature sensor for proper function and readings.
3
Inspect the throttle body for carbon buildup or obstruction.
4
Verify the air intake system for leaks, especially at hoses and connections.
5
Test fuel pressure to ensure the fuel system is operating within specifications.
6
Examine the spark plugs for wear or fouling.

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
•Throttle body cleaner
•Clean rags
•Wrench set
•Torque wrench
•Fuel pressure gauge
•Spark plug socket

Parts Required

•Engine coolant temperature sensor (if faulty)
•Spark plugs (if worn or fouled)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Check the engine coolant temperature sensor for proper function and readings.
3
Inspect the throttle body for carbon buildup or obstruction.
4
Verify the air intake system for leaks, especially at hoses and connections.
5
Test fuel pressure to ensure the fuel system is operating within specifications.
6
Examine the spark plugs for wear or fouling.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the negative battery terminal to ensure safety during repairs.

2. Clean Throttle Body

Sub-steps:
1. Remove the intake duct connected to the throttle body using a socket set.
2. Spray throttle body cleaner on a clean rag and wipe the interior of the throttle body to remove carbon deposits.
3. Reattach the intake duct, ensuring all clamps are secure.
Tools Required:
- Socket set
- Throttle body cleaner
- Clean rags

3. Replace Engine Coolant Temperature Sensor (if faulty)

Sub-steps:
1. Locate the engine coolant temperature sensor; it is typically near the thermostat housing.
2. Disconnect the electrical connector from the sensor.
3. Use a wrench to carefully unscrew the old sensor.
4. Install the new sensor and tighten to manufacturer specifications (usually around 15-20 ft-lbs).
5. Reconnect the electrical connector.
Tools Required:
- Wrench set
- Torque wrench

4. Check and Repair Fuel System

Sub-steps:
1. Attach a fuel pressure gauge to the fuel rail Schrader valve.
2. Turn the ignition to the "ON" position (do not start) and check the pressure; it should meet specifications (typically 50-60 psi).
3. If pressure is low, inspect the fuel pump and fuel filter for blockages or failures and replace as necessary.
Tools Required:
- Fuel pressure gauge
- Wrench set

5. Inspect Spark Plugs

Sub-steps:
1. Remove the spark plug wires and the spark plugs using a socket wrench.
2. Inspect each spark plug for signs of wear or fouling.
3. Replace any faulty spark plugs with new ones, ensuring proper gap (typically 0.054-0.056 inches).
4. Reinstall spark plugs and connect the spark plug wires.
Tools Required:
- Spark plug socket
- Torque wrench