A quick method checks whether a spark plug is structurally sound so you can rule out a bad plug or test one before it goes in a car. DIY Auto Repair Videos cannot guarantee against unauthorized modifications or improper use of this information, assumes no liability for property or personal damage from a vehicle repair after watching, creates no express or implied warranty of any particular result, and any injury, damage or loss from improper use of tools, equipment, or this information is the sole responsibility of the user.
