Tools You'll Need:
* Socket Set: Including a deep socket that fits your spark plugs (usually 5/8" or 13/16", check your owner's manual). A ratchet and extensions will also be necessary.
* Spark Plug Wire Puller: This helps remove the wires without damaging them.
* New Spark Plugs: Buy the correct type and heat range for your engine. Your owner's manual or an auto parts store can help you determine this.
* New Spark Plug Wires: Again, ensure you get the correct ones for your engine.
* Wrench (or socket) for coil pack(s) fasteners (if applicable): Some Windstars might have individual coil packs over each spark plug, others might have a single coil pack feeding multiple plugs.
* Torque Wrench: Essential for tightening the spark plugs to the proper specification to prevent damage.
* Gloves: To protect your hands.
* Safety Glasses: To protect your eyes.
* Penetrating Oil (like PB Blaster): May help loosen stubborn spark plugs.
* Shop Rags or Paper Towels: For cleanup.
* Jack and Jack Stands (or ramps): To safely lift the vehicle.
Procedure:
1. Safety First: Disconnect the negative battery cable before starting any work. Always support the vehicle securely with jack stands when working underneath.
2. Access the Engine: Consult your owner's manual for the best way to access the spark plugs and wires. Usually, this involves removing some plastic covers and possibly air intake components.
3. Remove the Spark Plug Wires: Use a spark plug wire puller to carefully remove each wire from its spark plug. Note the order of the wires—take pictures or make a diagram to ensure you reinstall them correctly.
4. Remove the Spark Plugs (If applicable, remove coil packs first): If your Windstar uses individual coil packs, carefully remove the fasteners securing each coil pack to the engine before removing the spark plugs. Use the appropriate socket and ratchet to remove the spark plugs. Spray penetrating oil if they're difficult to remove. Let it soak for a few minutes. Be very careful not to cross-thread or damage the spark plug threads.
5. Install the New Spark Plugs: Carefully install the new spark plugs by hand until they're snug. Then, using your torque wrench, tighten them to the manufacturer's specified torque. Over-tightening can damage the threads.
6. Install the New Spark Plug Wires (or reinstall the old ones): Connect the new wires to the spark plugs, ensuring they're securely seated. Refer to your diagram or photos to reinstall them in the correct firing order.
7. Reinstall Coil Packs (if applicable): Securely reattach the coil packs to the engine.
8. Reassemble: Put everything back together, reinstalling the air intake and other components you removed.
9. Reconnect the Battery: Reconnect the negative battery cable.
10. Start the Engine: Start the engine and listen for any unusual noises or misfires. If there's a problem, double-check your work.
Important Considerations:
* Firing Order: The firing order is crucial. Get this information from your owner's manual or a reliable online source. Installing the wires incorrectly can damage the engine.
* Torque Specification: Using a torque wrench is essential to avoid damaging the spark plugs or engine threads.
* Gap: Some spark plugs require a specific gap. Use a spark plug gapper to adjust if necessary. Consult your owner's manual or the spark plug packaging.
This guide provides a general overview. Always consult your vehicle's repair manual for specific instructions and torque specifications relevant to your year and engine. If you're unsure about any step, it's best to seek professional help. Improperly installing spark plugs or wires can damage your engine.
