how do I fix a rough start in my Ford Explorer Fifth Generation (2011-2019)

Ford Explorer Fifth Generation (2011-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

626 words

Problem Statement

Learn how to diagnose and fix a rough start issue in Ford Explorer Fifth Generation (2011-2019). Step-by-step guide with symptoms, diagnostics, and solutions.

Affected Component

Engine

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 any components.

Symptoms

•Engine stumbles during initial start
•Difficulty starting the engine
•Rough idle immediately after starting
•Increased engine vibrations
•Possible check engine light illumination

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any stored trouble codes.
2
Inspect the battery and connections for corrosion or loose terminals.
3
Check fuel pressure using a fuel pressure gauge to ensure proper fuel delivery.
4
Inspect the spark plugs and ignition coils for wear or damage.
5
Examine the air intake system for blockages or leaks, including the air filter.
6
Test the throttle body for proper operation and cleanliness.

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
•Socket set
•Spark plug socket
•Fuel pressure gauge
•Throttle body cleaner
•Wire brush

Parts Required

•New battery (if necessary)
•New spark plugs
•Throttle body gasket (if required)
•Fuel filter (if required)

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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 and connections for corrosion or loose terminals.
3
Check fuel pressure using a fuel pressure gauge to ensure proper fuel delivery.
4
Inspect the spark plugs and ignition coils for wear or damage.
5
Examine the air intake system for blockages or leaks, including the air filter.
6
Test the throttle body for proper operation and cleanliness.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface with the engine off and cooled down.
Disconnect the battery to prevent electrical shorts.

2. Check and Replace Battery

Sub-steps:
1. Inspect battery terminals for corrosion; clean if necessary using a wire brush.
2. Test the battery voltage with a multimeter; replace if voltage is below 12.4 volts.
3. If replacing, remove the old battery by loosening the terminal bolts and removing the battery hold-down bracket.
4. Install the new battery, connecting the positive terminal first, followed by the negative terminal.

3. Inspect and Replace Spark Plugs

Sub-steps:
1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coil connectors and remove the coils.
3. Use a spark plug socket to remove the old spark plugs.
4. Check the gap on the new spark plugs and adjust if necessary (typically 0.054 in or 1.4 mm for this model).
5. Install new spark plugs and reconnect the ignition coils.

4. Clean Throttle Body

Sub-steps:
1. Disconnect the throttle body electrical connector and any air intake ducts.
2. Remove the throttle body using a socket set, ensuring to note the position of any gaskets.
3. Clean the throttle body with throttle body cleaner and a soft cloth, focusing on the butterfly valve and surrounding areas.
4. Reinstall the throttle body with a new gasket, if necessary, and reconnect all electrical connectors.

5. Check Fuel System

Sub-steps:
1. Connect a fuel pressure gauge to the Schrader valve on the fuel rail.
2. Turn the ignition to the 'ON' position (do not start) to check fuel pressure; it should be within the manufacturer's specified range (typically around 55-65 psi).
3. If pressure is low, inspect the fuel pump and filter for issues.
4. Replace the fuel filter if it is clogged or if the fuel pump is not functioning properly.