How Long Does a Glow Plug Last?

A diesel engine is a very powerful and complicated piece of machinery. There are a variety of things that have to work together in order for the diesel engine to fire off and run as intended. Just like a gasoline engine, the diesel engine will need a spark to initiate the combustion process. Without this spark, the diesel engine will not be able to fire and run. The glow plug releases a small spark of electricity when the key is turned over. Every time that the diesel vehicle is started, the glow plugs will have to do the job they are intended for. However, while a gasoline engine needs the spark plugs to fire continuously during operation, a diesel engine uses compression and heat, not the glow plugs, to maintain combustion.

The glow plugs on a diesel engine will usually last around a 100,000 miles but can fail before then. Making sure that the right quality glow plugs are put in your vehicle is important in keeping it consistent and reliable. When the glow plugs begin to fail, there will be a variety of different issues that may arise. Neglecting to act when signs of glow plug trouble arise can leave you stranded. The longer that you wait to have the glow plugs replaced, the more damage you will have to contend with. The time that is put into getting the right professional help will be worth it considering the functionality a new set of glow plugs can provide. Due to the constant use that the glow plugs in an engine get, it is easy for them to become worn over time. In most cases, the glow plugs on a diesel vehicle will not get much attention until they are malfunctioning. It is your job to make sure that the signs of worn glow plugs are noticed and that you act quickly to get them replaced.

The following are some of the signs that you will notice when it is time to have your glow plugs replaced:

  • The diesel vehicle is hard to start during cold weather
  • There is more smoke coming from the vehicle than normal
  • The diesel engine is misfiring on a regular basis
  • Decreased fuel efficiency

Having a professional replace the glow plugs is your best course of action due to the complexity that is involved in this process.


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Chris

22 years of experience
2223 reviews
Chris
22 years of experience
Ford F-250 Super Duty V8-7.3L Turbo Diesel - Glow Plugs - Corona, California
Hard working very nice.
Ford Excursion - Glow Plugs - Huntington Beach, California
Very dedicated to his customer, he works very hard to get everything just right he knows his business.

Andrew

15 years of experience
499 reviews
Andrew
15 years of experience
Volkswagen Jetta L4-2.0L Turbo Diesel - Glow Plugs - Portland, Oregon
Great Mechanic. Super Fast. Super nice guy. 
Toyota Tercel - Car is not starting - Portland, Oregon
Exceptional work. Super nice. Answered all my questions. Fast, efficient, friendly.

Peter

43 years of experience
1321 reviews
Peter
43 years of experience
Volkswagen Beetle L4-1.9L Turbo Diesel - Glow Plugs - Tempe, Arizona
Yet another easy, professional service experience. Thanks Peter!
Dodge Spirit - Car is not starting - Chandler, Arizona
Peter worked on my car again today and like usual he was a 1/2 hour early. Honest, courteous and trustworthy. He worked on my car and I asked him, to please get me back on the road, because I needed the car for work. Peter went above and beyond to fix my car. He found the parts for my car, which was not easy to find, but with determination he found them. Thank you so much Peter. And to all, this mechanic is the most honest mechanic I have ever met in my entire life. Abe

Tien

23 years of experience
903 reviews
Tien
23 years of experience
Chevrolet Silverado 2500 HD V8-6.6L Turbo Diesel - Glow Plugs - Castro Valley, California
Professional, Timely and friendly. I would hire him again.
Land Rover Range Rover Sport - Brake Pads Replacement (Front) - San Lorenzo, California
Tien was timely and got straight to work. He did an inspection of the vehicle and gave me great advice for future maintenance. I will definitely recommend him to my sister who has the same car.

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