Learning how to properly read a spark plug for issues or needed replacement can save you a lot of time and money down the road - let Champion show you how.

An engine’s condition can be judged by the appearance of the spark plug’s firing end. If the firing end of a spark plug is brown or light gray, the condition can be judged to be good and the …

Want to diagnose engine issues fast? Learn how to read spark plugs, identify rich or lean conditions, spot oil burning, and use a spark plug color chart for easy analysis.

Note the brown to greyish tan color, and minimal amount of electrode erosion which clearly indicates the plug is in the correct heat range and has been operating in a "healthy" engine.

Bad plugs can cause overheating, rough running, power loss and even engine failure. Check your spark plugs regularly, and use this chart as a guide to spot performance problems.

Apr 29, 2016 · With help from the spark plug experts at NGK, we’ll teach you how to diagnose minor tuning issues or potentially major engine problems by examining your spark plugs. …

How to read the color of your spark plugs. This page shows some typical spark plugs and problems.

Check for the correct plug heat range, over advanced timing ignition, lean fuel mixture, insufficient engine cooling and lack of lubrication. Usually one or a combination of several engine …

Dec 17, 2025 · Reading a spark plug consists of examining and evaluating the condition and color of the tip of the plug. Learn how to read a spark plug so you can know how your vehicle is …

Feb 14, 2023 · The color and texture of a spark plug’s electrodes are key indicators for diagnosing engine problems, as well as letting you know how to tell if a spark plug is bad. A light tan or …