Why do you have to wait for the glow plugs to warm up on a diesel car

  • Thread starter Thread starter Rob122
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Rob122

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before starting it? My friend has a Fiat Punto Grande 52 plate car and she said to me before i start it i need to wait for the glow plugs to warm up. why is this? also how long to you have to wait? and what will happen if you just start it straight away without warming them up?
 
the gloplugs pre heat the diesel making it easier to fire up, on the dashboard is a light that tells you when the plugs are ready and finally from cold , like this morning you coulnt start the car without warming the plugs, after the car is warmed up it starts ok.
 
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