Here's a general guide, but this is NOT a substitute for a proper repair manual specific to your vehicle:
Tools You'll Need:
* Spark plug socket: This is a special socket with a rubber insert to grip the spark plug without damaging it. The size is usually 5/8" for Duratec engines, but double-check your owner's manual.
* Wrench: To fit the spark plug socket. A ratchet with extension will help reach some plugs.
* Spark plug gap tool: To check and adjust the gap of new spark plugs (if necessary).
* New spark plugs: Use the correct type and heat range specified in your owner's manual. Don't use the wrong ones!
* Gloves: To protect your hands.
* Penetrating oil (like PB Blaster): To help loosen stubborn plugs. Apply this several hours or overnight before attempting removal.
* Shop rags or paper towels: To keep things clean.
* Torque wrench: Crucial for tightening the new plugs to the correct specification (found in your owner's manual). Over-tightening can strip the threads.
* Owner's manual: For specific torque specifications and plug type.
Steps:
1. Safety First: Disconnect the negative terminal from your car battery. This prevents accidental shorts and protects you from electric shock.
2. Locate the Spark Plugs: The Duratec engine usually has the spark plugs located on top of the engine, under a plastic engine cover. You'll likely need to remove the cover; some fasteners may be hidden under plastic covers. Consult your owner's manual for precise location and removal procedure.
3. Remove the Ignition Coils: Carefully disconnect and remove the ignition coils from the spark plugs. They usually just pull straight up, but check your owner's manual for specific instructions. Take note of their location; you'll need to put them back in the same spot.
4. Remove the Spark Plugs: Spray penetrating oil onto the plugs if they are difficult to remove. Using the spark plug socket and wrench, carefully remove the old spark plugs. Turn them counterclockwise. If they're really stuck, use a breaker bar for added leverage, but be extremely careful not to strip the threads.
5. Inspect the Old Spark Plugs: Examine the old plugs for wear and tear. This can help diagnose other potential engine problems.
6. Install the New Spark Plugs: Before installing the new plugs, gently clean the threads and the spark plug well area with compressed air or a brush. Check the gap of the new plugs with the gap tool and adjust if necessary (according to the manufacturer's specifications). Carefully screw the new plugs into place by hand, ensuring they are straight. Then, use the spark plug socket and wrench to tighten them to the correct torque specification listed in your owner's manual. Do not over-tighten. Use your torque wrench!
7. Reinstall the Ignition Coils: Carefully reattach the ignition coils to the new spark plugs.
8. Reinstall the Engine Cover: Put the engine cover back on.
9. Reconnect the Battery: Reconnect the negative terminal to your battery.
10. Start the Engine: Start the engine and listen for any unusual sounds. If everything is okay, you're done!
Important Considerations:
* Consult your owner's manual: This is the single most important source of information for your specific vehicle. It will show you exactly where the spark plugs are located, the correct type of plugs to use, and the proper torque specifications.
* Take your time: Rushing can lead to mistakes. If you're unsure about any step, consult a professional.
* Protect your engine: Be careful not to drop anything into the engine cylinder.
* Use the right tools: Cheap tools can easily damage your spark plugs or engine.
This is a general guide. The specific procedures might vary slightly depending on your exact model. Always refer to your owner's manual and consider seeking professional help if you are not comfortable performing this task. Improperly installed spark plugs can cause serious engine damage.
