Tools You'll Need:
* Socket Wrench Set: The right size for your spark plugs (likely 5/8" or 13/16", check your owner's manual). A flexible ratchet will be invaluable.
* Spark Plug Socket: A deep well spark plug socket to avoid damaging the plugs. Ideally, one with a rubber insert to grip the plug securely.
* Extension(s): Multiple extensions, ideally flexible, are crucial for reaching the rear plugs. A universal joint will also help.
* Wrench: For the coil pack fasteners (likely 10mm).
* Needle-nose pliers: May be helpful for maneuvering the coil packs and wires.
* Penetrating oil (PB Blaster or similar): Apply this to the spark plugs at least 30 minutes before attempting removal to help loosen them.
* Shop Rags: To clean up any oil or grease.
* Gloves: Protect your hands.
* New Spark Plugs: The correct type for your engine (check your owner's manual).
Procedure:
1. Safety First: Disconnect the negative terminal of your battery.
2. Access: This is the hardest part. You'll have extremely limited access to the rear bank plugs. You may need to work from the top, partially from the bottom (possibly by removing the engine undertray), and potentially from the wheel well (partially removing the inner wheel liner might help).
3. Coil Packs: Locate the coil packs over the rear spark plugs. You'll need to carefully remove them. Usually, they are held on by two or three bolts. Once loosened, carefully lift the coil pack away. Note the location of each coil pack to ensure correct reinstallation. Some coil packs may have clips holding them in place rather than just bolts, so be mindful of that as well.
4. Spark Plugs: Using the spark plug socket, extensions, and a flexible ratchet, carefully remove the spark plugs one at a time. Be prepared for some resistance; penetrating oil should make a difference. Avoid dropping the old spark plugs into the engine cylinder.
5. Installation: Install the new spark plugs by hand, ensuring they are seated correctly. Tighten them with the spark plug socket and ratchet to the manufacturer's recommended torque specification (consult your owner's manual). Do not overtighten!
6. Coil Packs: Carefully reinstall the coil packs in their original positions, ensuring they are securely fastened.
7. Reconnect Battery: Reconnect the negative battery terminal.
8. Test: Start your engine and check for any misfires or other issues.
Important Considerations:
* Patience: This job is time-consuming and requires patience. Don't rush it.
* Photography: Take pictures before you start removing anything to help you remember where everything goes.
* Professional Help: If you're not comfortable working on your vehicle, consider taking it to a mechanic. The difficulty of accessing the rear plugs makes this job much more challenging than on many other vehicles.
* Torque Specs: Absolutely adhere to the torque specifications for the spark plugs and coil pack bolts from your owner's manual. Overtightening can cause damage.
This is a complex procedure. If you are not mechanically inclined, it's strongly recommended to seek professional help. Improperly installed spark plugs can cause engine damage. Remember to always consult your vehicle's repair manual for specific instructions and torque specifications.
