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Does a diesel car need glow plugs?

Updated: 4/28/2022
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12y ago

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Depending on the type of fuel system, a diesel engine may or may not use glow plugs. Glow plugs are generally used on Indirectly Injected diesel engines. They are used to heat the air that is drawn into the engine when the engine is cold. Since diesel engines use the heat created by compression to ignite the fuel/air charge, Glowplugs provide easier and smoother start ups. A Direct Injected diesel engine may use an Intake Air Heater or nothing at all, since the fuel being injected into the combustion chamber is atomized to a much finer degree (and therefor ignites at a lower temperature) than the relatively low injection pressure Indirect Injection system.

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Q: Does a diesel car need glow plugs?
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Does a diesel car have plugs?

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If your car is a Diesel engine and when you turn the key on it ignites the glow plugs because diesel gas can congeal (become thick) in cold weather. So the glow plugs warm the diesel and turn it back to a more liquid state.


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