Here's a general procedure. Consult your vehicle's repair manual (a Haynes or Chilton manual is a good investment) for detailed diagrams and torque specifications. Those specifications are crucial to avoid damaging your engine.
Tools You'll Need:
* Socket Set: A 5/8" socket (likely) is needed for the spark plugs. A 3/8" drive ratchet is usually sufficient. You might need a deep well socket for easier access.
* Spark Plug Socket: A spark plug socket is essential. It has a rubber insert to grip the plug without damaging it.
* Wrench or Socket for Coil Pack Bolts: This will vary depending on how your coil packs are secured; likely a 10mm or 8mm socket or wrench.
* Extension: A 3-6 inch extension will likely be needed to reach the plugs comfortably.
* Universal Joint: A universal joint allows you to work at angles, making access to rear plugs easier.
* Torque Wrench: Absolutely crucial to tighten the spark plugs to the correct specification. Over-tightening can damage the threads, while under-tightening can lead to misfires.
* Gloves: Protect your hands from grease and dirt.
* New Spark Plugs: Make sure you buy the correct type and gap for your engine. Check your owner's manual or auto parts store.
* Penetrating Oil (like PB Blaster): This can help loosen stubborn spark plugs, especially if they haven't been changed in a while.
* Shop Rags or Paper Towels: For cleaning up spills and keeping things tidy.
Procedure:
1. Disconnect the Negative Battery Terminal: This is crucial for safety.
2. Locate the Spark Plugs: They are located on top of the engine, nestled between the valve covers. The 3.7L V6 has six plugs.
3. Remove the Coil Packs: Each spark plug is topped with an individual coil pack. You'll need to remove the bolts securing each coil pack to the valve cover. Gently pull the coil pack up and away from the plug once the bolts are removed. Be careful not to drop or damage the coil pack.
4. Clean the Spark Plug Wells: Use compressed air or a shop rag to clean out any dirt or debris from the spark plug wells to prevent contamination.
5. Remove the Spark Plugs: Use the spark plug socket and ratchet to carefully remove the old spark plugs. If a plug is particularly stubborn, apply penetrating oil and let it sit for a while before trying again. Avoid cross-threading! Turn the socket counterclockwise.
6. Install the New Spark Plugs: Carefully install the new spark plugs by hand, screwing them in gently until they are snug. Do not use tools at this stage to avoid cross-threading. Then, use the spark plug socket and torque wrench to tighten the plugs to the manufacturer's specified torque. This is extremely important. Over-tightening can strip the threads.
7. Replace the Coil Packs: Carefully reinstall the coil packs, ensuring they are securely bolted down.
8. Reconnect the Negative Battery Terminal:
9. Start the Engine: Listen for any unusual sounds or misfires.
Important Considerations:
* Gap: Check the gap of your new spark plugs before installing them and adjust if necessary using a spark plug gapping tool. This is often crucial for proper operation.
* Torque: Consult your service manual for the correct torque specification for your spark plugs. Using a torque wrench is absolutely essential to avoid damaging the engine.
* Difficulty: Access to the rear spark plugs can be challenging. Using extensions and a universal joint will greatly improve your ability to reach them.
* If you're unsure: If you're not comfortable performing this task yourself, take your vehicle to a qualified mechanic. Improperly installed spark plugs can cause significant engine damage.
Remember to always refer to your vehicle's repair manual for specific instructions and torque specifications. This information is for general guidance only.
