how to fix Ford Explorer Fifth Generation (2011-2019) rough running and misfires

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to avoid electrical shorts.

2. Replace Spark Plugs

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil cover, if applicable.
• Disconnect the ignition coil connectors and remove the coils.
• Using a spark plug socket, carefully unscrew and remove the old spark plugs.
• Inspect the spark plug gaps and replace with new spark plugs, ensuring the gap is set to manufacturer specifications (typically around 0.044 inches for the Explorer).
• Torque the new spark plugs to the manufacturer’s specification (usually around 13 lb-ft).

3. Inspect and Replace Ignition Coils (if necessary)

• If any coils tested faulty, replace them with new ones.
• Tools Required: Ratchet, socket set.
• Remove the faulty ignition coils and replace them with new ones.
• Reconnect any electrical connectors to the new coils.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, line wrenches.
• Attach the fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure. It should match manufacturer specifications (typically around 55-65 psi).
• If pressure is low, inspect the fuel pump and fuel filter, replacing as necessary.

5. Inspect Air Intake System

• Visually inspect the air filter and MAF sensor for dirt or damage.
• Clean the MAF sensor using MAF sensor cleaner if it appears dirty.
• Replace the air filter if it is clogged.

6. Check Vacuum Lines

• Inspect all vacuum lines for cracks or disconnections.
• Replace any damaged lines to ensure proper air intake.