So how do you know if a set of Glow Plugs needs replacing? In this article, we look at six common signs that indicate glow plugs could be faulty or damaged.

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Engine warning light indicates something is wrong.

The dashboard’s engine warning light is frequently the first indicator that something is wrong. Vehicles with this light on should be taken as soon as possible to an authorised workshop for an accurate diagnosis and service. The engine warning light can be illuminated by a variety of faults; below, we list the indicators that suggest malfunctioning glow plugs.

Six signs it’s time to replace your glow plugs:

1. Hard start

The most typical sign of damaged glow plugs is an engine that is difficult to start. With adequately working glow plugs, the combustion chamber may warm up to the proper temperature in cold weather to ignite the gasoline and start the engine. Glow plugs should be examined to determine whether the battery or Fuel is in good condition.

2. Engine failure

Diesel engine combustion demands a high rate of compression and the proper timing and fuel injection volume. This causes the combustion of diesel fuel to start. Fuel quality, compression, and fuel injection problems can result in misfires.

Compression pressure and glow plug heat are the combustion chamber’s heat sources. For ignition to occur, it must reach a minimum temperature of 450° F/232° C. Unfortunately; the engine chamber won’t heat up to the proper temperatures if the glow plugs are defective.

3. Erratic idling

The engine will become increasingly difficult to start as temperatures drop, idle erratically, and emit white smoke from the exhaust for many minutes after it eventually starts if one or more glow plugs are burned out, carbon clogged, or broken. Check the fuel injection time if the tips of every glow plug are scorched.

4. A reduction in fuel efficiency

Fuel efficiency is determined by temperature and fuel, not glow plug performance. Glow plugs do, however, occasionally play a part.

Diesel may be mixed with particular additives during the cold months to reduce its freezing point according to the local climate. Most likely, the energy level of blended gasoline will be lower, and it will offer less fuel efficiency. To guarantee that all injected gasoline is thoroughly burned, engine operating temperatures should be regulated. Glow plugs contribute to the combustion chamber’s additional heating.

The engine’s performance will be compromised if the necessary temperature cannot be reached because of malfunctioning glow plugs, and it will have to work harder to satisfy the demands of the road. The car’s fuel economy will suffer as a result.

Suppose the car exhibits any of the other symptoms indicated here in addition to beginning to show decreased fuel efficiency. In that case, it should be taken as soon as possible to an authorised workshop for an accurate diagnosis and treatment.

5. White smoke

White smoke frequently results when there is insufficient heat to burn the fuel. Unburned fuel particles exit the exhaust as smoke, often emitting a strong fuel odour. White smoke from the exhaust is typical in cold weather until the engine has warmed up.

White smoke can be produced when starting an engine by damaged glow plugs or a malfunctioning glow plug control module. Low engine cranking speed, low compression, and air in the fuel system are potential reasons for too much white smoke. After the engine has warmed up, the engine may have faulty injectors, delayed injection timing, or a worn injection pump if white smoke is still present.

6. Black smoke

A fuel-to-air ratio imbalance, or having too much fuel and not enough air, results in black smoke. This indicates that either an excessive amount of fuel is added or more oxygen needs to be supplied to burn the fuel. In addition, glow plug malfunctions could interfere with the delicate diesel combustion process, which could cause the engine to exhaust black smoke. This is a red flag that something is awry, possibly with the glow plugs or other crucial combustion process elements.

Buy DENSO Glow Plugs

DENSO has long been a leading name in OEM automotive technology. Today, as the largest automotive component manufacturer we pour continuous R&D investment into helping the world’s top car-makers create increasingly responsive, efficient and reliable vehicles. find out more.

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