What is a Glow Plug

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What is a Glow Plug


The glow plug is a diesel vehicle component that manages the temperature in the combustion chamber optimally. The initial run of a diesel engine vehicle is cold. This component serves as a heater by raising the temperature of the cold combustion chamber.

Gasoline automobiles do not have glow plugs, but they create heat and transfer it to the vehicle’s necessary components in order to start the ignition in the combustion chamber. Glow plugs, which are about 10 cm in diameter, may achieve temperatures of up to 800 degrees.



The spring is the sign of glow plugs on instrument panels, which are commonly present in diesel automobiles. Glow plug faults can arise as a result of starters being squeezed before an arc-shaped symbol illuminates.

To avoid this issue, wait for the heating bulb warning on the instrument panel to go out. The engine can then be started by pressing the starter button.

How to Identify Glow Plug Failure?

Depending on how they are used, products or equipment in the vehicle system may malfunction over time. The following are symptoms of conditions in which the glow plug may malfunction and provide a warning:

  • A faulty glow plug has a direct impact on the engine. As a result, the heat required for ignition cannot be supplied, and the cylinders must apply additional pressure to ignite the fuel-air mixture.
  • Failure of the glow plug causes misfires in the engine system, resulting in poor vehicle performance.
  • Black gases coming from the exhaust pipe could indicate that the glow plug has failed.
  • A flashing condition in the glow plug sign on the vehicle’s warning instrument panel indicates that it is faulty.
  • If the car does not start or starts slowly, the glow plug may be faulty.

What Does a Glow Plug Do?

In automobiles with diesel engines, the glow plug, also known as the preheating plug, performs the following functions:

  • The glow plug heats the combustion chambers on the car.
  • The glow plug, which reduces exhaust emissions and prevents jerky system operation, quickly ignites the diesel engine even when it is cold.
  • The glow plug, which generates the necessary spark in the combustion chamber, guarantees that the car starts correctly.

What Causes Glow Plug Failure?

The cause of any glow plug issue could be directly tied to the engine. Because the engine is impacted, it will cause several difficulties in the vehicle system, so the source of the glow plug failure should be determined. The following are some of the causes of glow plug failure:



  • Starting without waiting for the caution light on the glow plug instrument panel to turn off
  • Leaving the vehicle’s ignition on for an extended period of time
  • Continuing to crank for an extended period of time despite the fact that the battery is known to be weak

These circumstances could cause the glow plug to fail. Because the spark plug deteriorates, especially in cold weather, your car may not move at all or may only move halfway because the engine does not warm up. As a result, in order to repair the factor that caused the glow plug to fail, you must get assistance from an auto shop.

Glow Plug Prices

Although the price of glow plugs varies based on the type, manufacturer, vehicle adaptability, and other technical elements, the average price is between 50 TL and 300 TL. Glow plug failure creates numerous problems in the car and affects driving safety.

You can also contact the most appropriate auto service to replace the glow plug, and by safeguarding your vehicle’s operating mechanism, you can protect both yourself and the flow of traffic.

Does Diesel Car Have Spark Plugs?

A diesel car, unlike a gasoline car, features a glow plug. To start the engine, a spark plug-free diesel vehicle heats the air and fuel mixture using the glow plug.

This component, also known as the preheating plug, allows the diesel engine’s cylinders to warm up before starting.

The vehicle’s functioning mechanism is actuated more easily when heat diffusion increases. Glow plugs come in a variety of materials, including metal, ceramic, and steel.

Glow Plug Failure Damages

If the glow plug fails, the automobile may not start at all, especially on cold days, or it may start jerkily or later than usual.

At the same time, the glow plug fails, resulting in black smoke from the exhaust. When a glow plug breaks due to user mistake, it can sometimes cause damage to the parts around it when it is changed or repaired accidentally.

The glow plug should be checked without injuring the engine or its surrounds, and the malfunctioning spark plug should be removed and replaced with a new one.

Does Glow Plug Failure Affect Fuel?

Because the glow plug functions as a heater, it has a direct effect on the fuel system until the car heats up.

As a result, a car with a malfunctioning glow plug consumes more fuel than usual during the warm-up process, and the vehicle’s working functions are reduced.

As a result, while completing engine tests on your car during routine maintenance, you should absolutely check for an ignition leak on the engine and evaluate its performance accordingly.

Otherwise, the vehicle’s fuel consumption will rise and its operating performance would suffer. To avoid these issues, the glow plug and engine’s functioning mechanism should be inspected, and if necessary, repair or replacement procedures should be carried out.

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