Tools You'll Need:
* Socket wrench set: You'll need a socket that fits your spark plugs (likely 5/8" or 13/16"). A ratchet with extensions will be helpful to reach all the plugs.
* Spark plug socket: A spark plug socket is essential. It has a rubber insert to prevent damaging the spark plug.
* Torque wrench: Absolutely crucial to avoid over-tightening the new spark plugs. Over-tightening can damage the threads and the engine block.
* Wrench for coil packs (if applicable): Some 1997 Expeditions used coil-on-plug (COP) ignition, while others used distributorless ignition with individual coil packs. You may need a wrench or socket to remove the coil packs before accessing the spark plugs. Check your engine to determine this.
* Needle-nose pliers or a small pick: To help remove any dirt or debris from the spark plug wells.
* New spark plugs: Buy the correct type and heat range recommended for your Expedition's engine. Your owner's manual or a parts store can help you determine this.
* Gloves: To protect your hands from grease and dirt.
* Safety Glasses: To protect your eyes from debris.
* Penetrating oil (like PB Blaster): May be helpful if the spark plugs are difficult to remove.
Procedure:
1. Safety First: Disconnect the negative terminal from your battery. This is crucial to prevent electrical shocks.
2. Locate the Spark Plugs: The spark plugs are located on the top of the engine. You'll need to remove various components, depending on the engine and the location of the spark plug. This often involves removing components like the air intake system, air cleaner housing and sometimes even the upper intake manifold to access rear spark plugs. The rear ones are typically the most difficult to reach.
3. Remove the Coil Packs (If Applicable): If your Expedition has individual coil packs, you will need to carefully disconnect the electrical connector from each coil pack and then remove the coil pack itself using the appropriate wrench. Take pictures or make notes before disconnecting anything to ensure proper reassembly.
4. Clean the Spark Plug Wells: Use compressed air or a shop vac to remove any dirt, debris or oil from the spark plug wells. This prevents debris from falling into the cylinder when you remove and install the spark plugs.
5. Remove the Old Spark Plugs: Carefully use your spark plug socket to remove the old spark plugs. Apply penetrating oil if needed and let it sit for a few minutes before trying again. Avoid applying too much force, as you could strip the threads. Turn counterclockwise to loosen.
6. Inspect the Old Spark Plugs: Examine the old plugs for signs of wear, fouling, or damage. This can give you clues about potential engine problems.
7. Install the New Spark Plugs: Carefully screw the new spark plugs into the cylinder heads by hand until they are snug. Do not overtighten by hand.
8. Tighten with Torque Wrench: Use your torque wrench to tighten the new spark plugs to the manufacturer's specified torque. This is extremely important to avoid damaging the threads. The torque specification will be in your owner's manual or on the packaging of the spark plugs.
9. Reinstall Coil Packs (If Applicable): Carefully reinstall the coil packs and reconnect the electrical connectors.
10. Reassemble: Reinstall all components you removed to access the spark plugs (air cleaner, air intake, etc.), ensuring everything is properly connected.
11. Reconnect the Battery: Reconnect the negative battery terminal.
12. Start the Engine: Start the engine and listen for any unusual noises or misfires. If you have any problems, double-check your work and consult a professional mechanic.
Important Notes:
* If you are not comfortable performing this task, take your Expedition to a qualified mechanic. Improperly installed spark plugs can cause serious engine damage.
* This is a general guide. Specific procedures may vary depending on the year, model, and engine configuration of your 1997 Ford Expedition. Consult your owner's manual for detailed instructions.
* Take pictures and/or notes as you disassemble the components This will greatly assist you in reassembly.
Remember safety first! If you are unsure about any step, seek professional help.
