Have you noticed something odd about your vehicle’s spark plug? Perhaps it has changed its colour. Sometimes the change in colour is not good news, while at other times, it’s very normal.
The colour of your spark plug will tell you a lot about your vehicle’s performance. Reading your spark plugs can provide multiple clues about your engine’s condition and save you money.
Let’s have a look at the different colours of spark plugs when they are undergoing some problems.
No Colour: If there is no colour on your plug, if they do not have a dark brown colour, or if they are not coloured at all, it suggests that the plugs are dead and not firing at all. Because a spark plug which is in working condition will collect some deposit and have a different tone than the original one. Check your fuel and ignition wire.
Black:If you notice any blackish build-up on your spark plug, check your engine immediately. It can be an indication of a weak spark plug or an overly rich fuel mixture as a result of it you may notice slow starting of the engine and misfires.
Ashy: If there is any ashy coating on spark plug, it can be because of oil leak into the combustion chamber and the quality of plug is low and not good. It can cause misfire and can affect the performance of your engine too.
Shades of green: A plug can be a little green because of lead content in gasoline which reacts with the components in electrodes and cause corrosion and erosion in the plugs. It indicates that the performance of your engine is not good and also it can be the sign of heavy oxidation
Yellow glaze: If there is any yellowish component on your sparkplug’s electrode and on the tip, it can inhibit conductivity. It can keep the spark from being able to jump the gap. You can easily clean it by cleaner and wipe it with a clean cloth.
These are some colour changes in your spark plugthat can harm your vehicle’s performance. Although a healthy spark plug will always have a bit of electrode erosion on it, but you will never find any abnormal deposits on it of some other colour such as some light tan, gray, or brownish.