Damage to diesel car trying to start it before the glow plug light goes out?

Will my partner do my diesel car any damage by consistently trying to start the car before the glow plug light goes out on these cold mornings?

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  • 7 years ago
    Best Answer

    The purpose of the glow plugs are to heat the AIR in the inlet manifold - to around 600*C - not the fuel! - Have a look at how diesel engines work. Air is drawn into the cylinders,compressed, ( heating it up ) and fuel is then injected as the piston reaches Top Dead Centre. As others have said, the worst that can happen short term is flattening the battery.

  • 4 years ago

    This Site Might Help You.

    RE:

    Damage to diesel car trying to start it before the glow plug light goes out?

    Will my partner do my diesel car any damage by consistently trying to start the car before the glow plug light goes out on these cold mornings?

    Source(s): damage diesel car start glow plug light out: https://shortly.im/FvSEs
  • 3 years ago

    Glow Plug Light

  • 7 years ago

    No, but he will run the battery down trying to start, that 5 seconds or so, is for the glow plugs to warm the fuel, but once warmed up, it will not need the glow plugs again,as the cylinders will stay hot., so if you were to stop ,and say half hour later re start, it should fire up right away

    Source(s): oldtimer
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  • 7 years ago

    it can do what can happen is if the glow plug is not hot enough you can get raw/unburnt Diesell down the side of the cylinderr cursing excesss engine wear it is not uncommonn to turn the engine on let the light go out then turn the ignition off then let the light go out 2 or 3 times in cold weather so you need to train your partner quick

  • 7 years ago

    It's your car and tell him if he can't start it the right way to stay out of it. Anytime you don't follow directions you can screw something up and the repair bill for a diesel engine will knock your socks off.

  • 4 years ago

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  • 7 years ago

    No other than wearing rings early due to unburnt diesel being sprayed into cylinder and removing oil film ftom cyl walls. Wont help catalyst life either. Far better to learn a tad patience and crank when light goes out.

    Source(s): Tested diesel engines for a living nearly 40 years.
  • ?
    Lv 7
    7 years ago

    Only by unnecessarily and pointlessly exercising the battery and starter.

  • Anonymous
    7 years ago

    Yes, quite!

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