What should I look for in a spark plug?
By examining the insulator firing nose color, an experienced engine tuner can determine a great deal about the engine’s overall operating condition. In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition.
Is it normal to have a spark plug gap?
Congratulations – If you see brownish or gray deposits on the electrode like this photo, and your electrode isn’t worn and the ground armature isn’t broke, your spark plug is Normal. You can go ahead and check the spark plug gap, and reinstall it.
How is the condition of a spark plug determined?
Signs of fouling or excessive heat must be traced quickly to prevent further deterioration of performance and possible engine damage. An engine’s condition can be judged by the appearance of the spark plug’s firing end.
How to read the heat range of a spark plug?
#3 The threaded portion of the plug gives you the heat range, look at the threads you’ll see that a few toward the tip are a dull burnt looking color the rest are black and shiny. You want about 2 threads showing the heat on the end of the plug and the rest of the threads to be shiny, this plug is impossible to read because of the oil mess.
By examining the insulator firing nose color, an experienced engine tuner can determine a great deal about the engine’s overall operating condition. In general, a light tan/gray color tells you that the spark plug is operating at optimum temperature and that the engine is in good condition.
Signs of fouling or excessive heat must be traced quickly to prevent further deterioration of performance and possible engine damage. An engine’s condition can be judged by the appearance of the spark plug’s firing end.
Congratulations – If you see brownish or gray deposits on the electrode like this photo, and your electrode isn’t worn and the ground armature isn’t broke, your spark plug is Normal. You can go ahead and check the spark plug gap, and reinstall it.
#3 The threaded portion of the plug gives you the heat range, look at the threads you’ll see that a few toward the tip are a dull burnt looking color the rest are black and shiny. You want about 2 threads showing the heat on the end of the plug and the rest of the threads to be shiny, this plug is impossible to read because of the oil mess.