Signs of Faulty Diesel Glow Plug in the Car

Cars have a heating component called a diesel glow plug to start the diesel engine. Without heat generated from the plug, the diesel engine cannot start and operate. The diesel engines will rely on the diesel glow plug to drive the car in colder environments.

If the diesel glow plug is failed, it will affect the functions of the diesel engine. Here are the common signs that define the failed diesel glow plug of the car.

Signs of Faulty Diesel Glow Plug in the Car
Signs of Faulty Diesel Glow Plug in the Car

Signs of Faulty Diesel Glow Plug in the Car

In this part of this blog post, we’ll go over some common signs of a faulty diesel glow plug in your car. By being aware of these signs, you’ll be able to diagnose the problem and get it fixed before it becomes a bigger issue. So, let’s see these signs.

Black Smoke From the Exhaust

Have you ever driven behind someone and seen the black smoke pouring out of their exhaust? Did you wonder what was making all that black smoke? Well, the black smoke coming out of the exhaust pipe indicates a failed diesel glow plug. Failed diesel glow plug will certainly put a damper on the diesel combustion.

If your vehicle also does the same thing then you have to think that the glow plug is facing the problem and you need to check them and work on them as soon as possible.

Engine Starting Issues

It’s that time of year again – the days are getting shorter and the weather is cooling down. That means it’s time to start preparing your car for winter. This is a very common tension in the mind of a number of car owners.

 If you’re having starting issues, Due to the failed diesel glow plug, you will notice it is difficult to start up the car. As a result, more pressure is put on the engine for the successful ignition in the car. So, you have to take this one very seriously.

Illuminated engine light

When the diesel glow plug is failed, the engine light will turn on in the dashboard. Some people called it as the check engine light is on. This becomes on when there is any problem on a vehicle. 

If any of your engine glow plugs are faulty and they are not being able to generate enough heat then you may think that there is a problem with it. You have to check the other signs and finally scan the engine with a scanner. And finally, take decision on the result.

So for determining the real issues behind it, you should use a diagnostic scan tool. Misfired engine. When the fuel does not ignite properly in the cylinder, it will cause engine misfire. If the diesel glow plug is not functioning, there will likely be a misfire during ignition.


What are the signs of Duramax diesel glow plug problems?

Duramax diesel engines are some of the most powerful and durable in the world. But, like all machines, they can sometimes experience problems. One such problem is with glow plugs: small heating coils that help get combustion started in cold weather conditions. If your Duramax engine has experienced a misfire or other issue after starting up on a cold morning, you might have Duramax diesel glow plug problems.

What are 6.0 Powerstroke glow plug problems?

It’s not often that you hear about problems with 6.0 Powerstroke engines, but when they do occur, they can be pretty serious. One of the most common problems with these engines is related to the glow plugs. So if you’re worried that you may be experiencing some symptoms of glow plug failure, then read the full article. There are some signs of glow plug problems.


Whether you own a diesel engine or not, knowing the signs of when your glow plug needs to be changed is important for preventing future problems. A failed diesel glow plug can lead to expensive repair bills and even car breakdowns if it’s left unaddressed. 

We recommend changing out your glow plugs every 25-30k miles in most cases so that you don’t run into any trouble down the road. Read Its Engine regularly to be an expert in the engine. 

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