What is a glow plug?

A glow plug is a device used in diesel engines to aid in starting the engine. It is a heating element that is inserted into the combustion chamber of the engine. When the engine is started, the glow plug heats up and helps to ignite the fuel-air mixture in the cylinder, making it easier for the engine to start in cold weather conditions.

Glow plugs are typically made of a ceramic material that can withstand high temperatures and rapid heating and cooling cycles. They are powered by the vehicle's battery and are controlled by the engine's electronic control unit.

Glow plugs are essential in diesel engines, as the compression ignition process in these engines relies on high temperatures to ignite the fuel. Without a functioning glow plug, starting a diesel engine in cold weather can be difficult or even impossible.

It is important to regularly check and maintain glow plugs to ensure they are functioning properly. If a glow plug fails, it can cause starting issues and potentially damage the engine.