Gap: The distance between the electrodes should be set to the manufacturer's specification. This information can usually be found in the owner's manual.
Condition: The electrodes should be sharp and free of damage. If they are rounded or have any cracks or chips, the spark plug needs to be replaced.
In addition to checking the spark plug itself, it is also important to check the spark plug wire and connection. The wire should be free of any damage or cracks, and the connection should be snug.
