By electricity drawn from the car battery.
The heat generated by a glow plug gets directed to the cylinders. The glow plug is a heating device mostly used to help start diesel engines. It is pencil shaped.
The glow plus starter provides the original heat source -this is done with heat not a spark- to start the engine. After your car is on idle you could remove the glow plug starter and your car would continue running (try it if you want, ads that little bit of speed from less weight).
MASSIVE 1
Change the pre=heat (glow plug) relay.
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We're do I find glow plug relay
you need to check your glow plug relay it is most likely going out you can jumper it to see if the glow plug light will come back on to start engine
the bottom glow plug will glow but is weak. the plug needs to glow red hot all the way across and up and down the ignigter.replace the plug
On the top of the motor there is two of the the glow plug relay has no cover on it
The glow plug is the diesel version of a spark plug. There are 4 glow plugs (1 for each cyl.) located usually near the injector on top of the cylinder head.AnswerThe glow plug is NOT the diesel version of a spark plug, they both do different jobs. The glow plug is there to aid starting when the engine is cold. The spark plug is there to provide the spark for combustion to take place in a petrol/gasoline engine.