why does my Ford Explorer's engine run rough at idle

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plugs

• Remove the ignition coil or spark plug wires from the spark plugs.
• Using a socket wrench, carefully remove the spark plugs.
• Inspect each spark plug for wear or carbon buildup.
• Replace with new spark plugs if necessary, ensuring the gap is set to manufacturer specifications (typically around 0.054 inches for many Ford engines).
• Reinstall the ignition coils or spark plug wires.

3. Check and Replace Fuel Filter (if needed)

• Locate the fuel filter and relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect fuel lines from the filter using the appropriate tool.
• Remove and replace the fuel filter, ensuring the flow direction is correct as indicated by arrows on the filter.
• Reconnect fuel lines and reinstall the fuel pump fuse.

4. Clean Throttle Body

• Remove the air intake duct to access the throttle body.
• Using throttle body cleaner and a soft cloth, clean the throttle plate and surrounding surfaces.
• Ensure the throttle body operates smoothly without sticking.
• Reinstall the air intake duct.

5. Test Drive and Check for Codes

• Reconnect the battery and clear any trouble codes using the OBD-II scanner.
• Start the engine and allow it to reach normal operating temperature.
• Take the vehicle for a test drive to ensure smooth operation at idle and under load.