Here's a general guide. This is NOT a substitute for your owner's manual and professional advice if you are unsure.
Tools You'll Need:
* Spark plug socket: The correct size for your spark plugs (likely 5/8" or 13/16", check your manual). This socket should be *deep* to reach the spark plug well. A spark plug socket with a rubber insert is highly recommended to prevent rounding the plug.
* Wrench: To loosen the spark plug wires. The type depends on the wire connector; some are simple push-on, some have a clip.
* Ratchet and extension: To reach the spark plugs. A flexible extension is very helpful.
* Spark plug gap tool: To check and adjust the gap on the new spark plugs (if necessary – check your manual or the new plug packaging).
* New spark plugs: The correct type for your engine (check your owner's manual).
* Gloves: To keep your hands clean.
* Shop rags or paper towels: To clean up any oil or debris.
* Penetrating oil (like PB Blaster): This can help loosen stubborn spark plugs. Apply this several hours, or even overnight, before attempting to remove them.
Procedure:
1. Safety First: Disconnect the negative (-) terminal from your car battery. This prevents accidental shorts and electrical shocks.
2. Locate the Spark Plugs: The spark plugs are typically located on the top of the engine, under a plastic engine cover (if equipped). Remove the cover if necessary. Consult your owner's manual for the exact location of the spark plugs.
3. Remove the Spark Plug Wires: Carefully disconnect the spark plug wires from the spark plugs. Sometimes they just pull off; others have a clip or retainer. Make a note of which wire goes to which plug to avoid misplacing them. Take a picture if it helps.
4. Remove the Spark Plugs: Use the spark plug socket and ratchet to carefully remove the spark plugs. Go slowly and avoid dropping the socket into the engine. If a spark plug is difficult to remove, apply more penetrating oil and let it sit for a while before trying again. Do not use excessive force. A rounded spark plug is a very frustrating problem.
5. Inspect the Old Spark Plugs: Examine the old spark plugs for signs of wear, fouling, or damage. This can provide clues about potential engine problems.
6. Install the New Spark Plugs: Carefully install the new spark plugs by hand, screwing them in until they are snug. Then, using the spark plug socket and ratchet, tighten them to the specified torque. Do not overtighten! Overtightening can damage the spark plug threads or the cylinder head.
7. Reconnect the Spark Plug Wires: Reconnect the spark plug wires to the new spark plugs, ensuring a secure connection. Again, refer to the notes you made or the photo you took.
8. Reinstall the Engine Cover (if applicable): Replace the engine cover if you removed it earlier.
9. Reconnect the Battery: Reconnect the negative (-) terminal to your car battery.
10. Start the Engine: Start the engine and listen for any unusual sounds. Check for any leaks or other problems.
Important Considerations:
* Torque Specifications: The torque specification for tightening the spark plugs is crucial. Over-tightening can strip the threads, while under-tightening can cause leaks and misfires. Find this information in your owner's manual.
* Gap: Check the gap of the new spark plugs and adjust it if necessary using a spark plug gap tool. The correct gap is specified in your owner's manual or on the spark plug packaging.
* Engine Coolant: The engine should be completely cool before you start this job.
* Professional Help: If you're not comfortable performing this task, take your car to a qualified mechanic.
This guide provides a general overview. Always refer to your 1999 Chrysler Cirrus owner's manual for detailed instructions and torque specifications specific to your vehicle. Improperly performed maintenance can lead to engine damage.
