A glow plug looks similar to a spark plug. Instead of spark plugs, glow plugs are used to heat and start diesel engines. It takes only two or three seconds for glow plugs, once activated, to generate sufficient heat to warm the engine block so that it's safe to start the vehicle. Glow plugs get it going when the engine is cold or ambient temperatures are low. Here at J&S we stock and supply quality glow plugs for any car. Just order on line 365/24 or Call Us +353 1 629 7999