1) To Change Your Spark Plugs, You'll Need:

1. A Ratchet Socket Drive Wrench
2. An Extension Bar
3. Spark Plug Socket, Usually Included In Most Ratchet Socket Sets

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3) Wait For The Engine To Cool Down So That You Can Touch Its Components.

4) Hold The Wire Of The Boot With Your Fingertips. The Wire Is Easily Identified As A Little Cap On The End Of A Spark Plug. Gently Twist The Boot Until The Wire Comes Out. If The Wires Do Not Come Out Easily, Twist Them Gently Left And Right.

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6) To Check Whether The Plugs Need Replacing, Remove One Spark Plug And Check The Gap. If The Contacts Are Burnt Out, Refit The Plug And Lead To The Correct Torque Setting. Spark Plugs Fire Up In A Specific Order, And Crossing A Wire To The Wrong Plug Will Make The Engine Run Rough Or Stop It Completely, Causing Major Damage To Your Engine. So, You Need To Remove The Plugs One At A Time, Keeping Track Of The Order.

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8) In Case You Are Sure To Replace The Spark Plugs, It Is Advisable To Replace With The Plugs Of Same Specifications As Your Previous Ones. First, Clean The Wire Ends, Preferably With The Help Of Wire Brush.

9) Use The Spark-plug Socket To Remove Each Plug And Replace With A New One. Tighten A Bit With Hand Only (say, 1/8th Of A Turn). Be Cautious As You Do So As Over-tightening Can Damage The Thread Strip The Thread On The Head Of The Engine. Use Your Spark Plug Wrench Or Socket To Give The Spark Plug A Final Strong Turn.

10) Gently Re-attach Each Wire Into The Specific Spark Plug With Your Fingertips. It Is A Must To Put The Wires Back In The Right Sequence On Engines With Multiple Cylinders.