my Ford Explorer has a check engine light and runs rough what should I check

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

520 words

Problem Statement

Learn how to diagnose and fix check engine light and rough idle issues in Ford Explorer. Step-by-step guide with diagnostic procedures 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 performing any repairs.

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Poor fuel economy
•Increased engine vibrations

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the air filter for clogs or dirt that could restrict airflow.
3
Check fuel pressure using a fuel pressure gauge to ensure proper fuel delivery.
4
Inspect spark plugs for wear or fouling.
5
Examine ignition coils for proper function and signs of damage.
6
Assess vacuum hoses for leaks or disconnections.

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
•Spark plug socket
•Multimeter
•Basic hand tools (screwdrivers, wrenches)

Parts Required

•Air filter
•Spark plugs
•Ignition coils (if needed)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify specific trouble codes.
2
Inspect the air filter for clogs or dirt that could restrict airflow.
3
Check fuel pressure using a fuel pressure gauge to ensure proper fuel delivery.
4
Inspect spark plugs for wear or fouling.
5
Examine ignition coils for proper function and signs of damage.
6
Assess vacuum hoses for leaks or disconnections.

Solution

1. Preparation

Gather tools and materials.
Ensure the vehicle is parked on a flat surface and the engine is cool.

2. Scan for Error Codes

Connect the OBD-II scanner to the vehicle’s diagnostic port.
Turn the ignition to the "on" position without starting the engine.
Retrieve and note any trouble codes for further diagnostics.

3. Inspect and Replace Air Filter

Locate the air filter housing.
Remove the air filter cover by unscrewing or unclipping it.
Take out the old air filter and inspect it for dirt and damage.
Replace with a new air filter if necessary, ensuring it fits snugly.

4. Check and Replace Spark Plugs

Disconnect the negative battery terminal for safety.
Remove the ignition coil or spark plug wire.
Use a spark plug socket to remove the spark plug.
Inspect the spark plug for wear; replace if necessary.
Reinstall the new spark plug to the manufacturer’s torque specification (usually around 13-15 lb-ft).

5. Inspect Ignition Coils

Visually check the ignition coils for cracks or signs of wear.
If necessary, remove the coil from the plug and test its resistance using a multimeter according to the manufacturer’s specifications.
Replace any faulty coils.

6. Check Fuel Pressure

Connect the fuel pressure gauge to the fuel rail test port.
Turn the ignition on (do not start the engine) and check the pressure reading against manufacturer specifications.
If pressure is low, inspect the fuel pump or fuel filter for issues.