1. Incorrect Spark Plugs: Ensure that you installed the correct spark plugs specified for your 2002 Ford Escape 6-cylinder engine. Check the owner's manual or consult with a reliable auto parts store for the recommended spark plug type.
2. Damaged Spark Plug Wires: Verify that the spark plug wires are properly connected and not damaged. Ensure they are securely attached to both the spark plugs and the distributor or ignition coil.
3. Faulty Air Filter Installation: Inspect the air filter housing to ensure it is properly sealed and the air filter is correctly seated. An improperly installed air filter can cause rough idling and engine performance issues.
4. Vacuum Leaks: Check for any vacuum leaks that may have occurred during the spark plug or air filter replacement. Vacuum leaks can cause the engine to run lean, resulting in a check engine light and rough idling.
5. Mass Air Flow (MAF) Sensor Issues: The MAF sensor measures the amount of air entering the engine. If it is dirty or malfunctioning, it can affect the air-fuel mixture and cause engine performance problems.
6. Fuel Injector Problems: Faulty or clogged fuel injectors can disrupt the fuel delivery to the engine, leading to rough idling and a check engine light.
7. Ignition Coil Issues: A malfunctioning ignition coil can affect the spark delivery to the spark plugs, causing engine misfires and rough running.
Recommendations:
1. Revisit Spark Plug Installation: Double-check that the spark plugs are the correct type and properly installed. Ensure the spark plug wires are securely connected.
2. Inspect Air Filter Installation: Verify that the air filter is seated correctly, and the air filter housing is sealed properly.
3. Look for Vacuum Leaks: Visually inspect the vacuum lines and connections to ensure they are intact and properly connected.
4. Clean MAF Sensor: Remove the MAF sensor and clean it carefully with MAF sensor cleaner. Make sure it is dry before reinstalling.
5. Test Fuel Injectors: Have a mechanic test the fuel injectors to ensure they are functioning properly.
6. Check Ignition Coils: If you have the necessary tools and skills, test the ignition coils to identify any that may be malfunctioning.
7. Consult a Mechanic: If the check engine light persists, and the engine continues to run rough, seek assistance from a qualified mechanic for proper diagnosis and repairs. They will have the necessary equipment and expertise to identify and resolve the underlying issue.
