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It is broken. Continuous glow plugs are for emergency generators in freezing climates. On all other engines, the glow plug is not continuous. It would serve no purpose. The continuous glow plug does not offer any benefit once the engine is running.
I had this problem and it was broken solder on the timing circuit board for the glow plugs
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We're do I find glow plug relay
To remove a broken glow plug can be difficult, especially if the head is still fitted to the engine and still in the car. If you can gain access to a mig welder and an appropriately sized nut, you can weld the nut to the remains of the glow plug, allow to cool and then using a socket carefully ease the plug anti clock wise, then clock wise to help break the bond that has formed between the threads. If the head is on the bench this task is much easier, failing this you can have the plug wire eroded out of the head (whilst leaving the threads in perfect condition)but this can be expensive.
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.
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.