Tools You'll Need:
* Socket set: You'll need a socket that fits your spark plugs (likely 5/8" or 13/16"). A deep well socket is highly recommended for easier access.
* Spark plug socket with rubber insert: This prevents damage to the spark plug porcelain.
* Wrench: For removing the spark plug wires.
* Ratchet and extension(s): To reach the rear spark plugs. You might need several extensions to reach them comfortably. A swivel extension can be extremely helpful.
* New spark plugs: Buy the correct type and heat range specified in your owner's manual.
* Gloves: To protect your hands.
* Safety glasses: Protect your eyes from debris.
* Penetrating oil (like PB Blaster): May help loosen stuck spark plugs.
* Torque wrench: To tighten the spark plugs to the manufacturer's specified torque. This is crucial to prevent damage.
Procedure:
1. Safety First: Disconnect the negative battery terminal. This prevents accidental shorts and protects your electrical system.
2. Access: This is the hardest part. You'll likely need to remove some components to gain sufficient access to the rear spark plugs. This could involve:
* Intake manifold components: Possibly removing parts of the air intake system to create more room. Consult your repair manual for specifics.
* Other components: Depending on the engine, other components might need to be moved or partially removed for clearance. This is where the repair manual is *essential*.
* Consider Working from the Bottom: You might find that accessing the spark plugs from underneath the vehicle, using a jack and jack stands for proper safety, is easier than from the top.
3. Spark Plug Wires: Carefully disconnect the spark plug wires one by one. Make a note or take a picture of which wire goes to which spark plug to avoid misconnecting them later.
4. Remove Spark Plugs: Use the spark plug socket and ratchet with extensions to carefully remove the old spark plugs. Apply penetrating oil if they're difficult to remove. Avoid cross-threading. Turn counter-clockwise to loosen.
5. Clean the Spark Plug Wells: Use compressed air or a shop vacuum to clean any debris from the spark plug wells. This prevents debris from falling into the cylinders.
6. Install New Spark Plugs: Install the new spark plugs by hand, threading them in gently. Once they're started, use the spark plug socket to tighten them. Do not overtighten. Use your torque wrench and tighten to the manufacturer's specified torque (found in your repair manual).
7. Reconnect Spark Plug Wires: Reconnect the spark plug wires, ensuring they're securely attached.
8. Reassemble: Carefully reassemble any components you removed to gain access to the spark plugs.
9. Reconnect Battery Terminal: Reconnect the negative battery terminal.
10. Test: Start the engine and listen for any misfires or unusual noises.
Important Considerations:
* Repair Manual: This cannot be stressed enough. Get a repair manual specific to your 1999 Chrysler Town & Country. It will show you exactly what needs to be removed and how to do it safely.
* Patience: This job can be time-consuming and frustrating due to the limited access. Take your time and be methodical.
* Professional Help: If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic.
This is a general guide, and the specific steps may vary depending on your vehicle's configuration. Always prioritize safety and consult your repair manual for detailed instructions.
