Spark plugs are one of the most misunderstood components of an engine. Numerous questions have surfaced over the years, leaving many people confused.

    Spark plugs are the "window" into your engine, and can be used as a valuable diagnostic tool. The spark plug displays symptoms and conditions of the engine's performance. The experienced tuner can analyze these symptoms to track down the root cause of many problems, or to determine air/fuel ratios.

     Due to spark plug's location it is exposed to extreme temperature variations, chemicals, fuels and oils. It is also attacked by cylinder pressures produced by the piston and cam timing, then it is also assaulted by high-output ignition units. As a result of all of this, one can effectively learn what the engine is doing by reading the firing end of the spark plugs.

     By careful examining the spark plug's color, gap, and any deposits that reside on it, you will be shown the efficiencies as well as deficiencies of what is going on in the engine. Spark plugs should be checked at least monthly, and replaced as often as necessary. Follow the manufacturers recommendations.

    This guide is provided for informational purposes only. Always seek the advice of a trained professional before servicing any engine.

    We are not responsible for the use or misuse of this information and any results thereof.