Best Glow Plugs For 7.3 Powerstroke

If you own a diesel vehicle, then you know the importance of a good glow plug. Unfortunately, a good quality glow plug can be hard to come by. Thus finding the best glow plugs for 7.3 Powerstroke isn’t easy.

The many different brands that claim to be the best make things challenging. So which is the best glow plugs for 7.3 idi. After analyzing a variety of options, we narrowed it down to six. Our top pick is the OEM Ford / Motorcraft Idi 7.3l DIESEL Glow Plug Zd-9- Zf2tz-12a342-a... * (#ad).

The latter offers exceptional performance compared to the other options on the list. At number two is the ZD-11 Set of 8 Motorcraft Glow Plugs F4TZ-12A342-BA for Use with Ford... * (#ad) While these two top our list, there are other great options on the list if you are looking for something affordable.

But before we get into the reviews, let’s discuss some important topics.

What Causes Glow Plugs To Fail

Glow plugs are essential components to the proper functioning of a diesel engine. When these components fail, so does your engine. So what are some of the reasons why they may fail?

First, carbon buildup in the pre-chamber will cause the glow plugs to fail.

The buildup of carbon in the chamber causes the tips to burn out. To avoid this, ensure you use the right amount of carbon reamer when installing the plugs.

Second, if the plugs are not well made and have defects, they will not function properly.

This is especially if you have the incorrect pattern of fuel injectors. When this happens, you should notice a large stream of raw fuel, which creates stress in the plugs.

Thirdly is the failure of the glow relay.

When this happens, the battery isn’t properly charged which will lead to the current drain. You can do a volt test of the plug circuit to check if there is any current drain. If your glow plug relay is not working perfectly we would advise you to opt for a glow plug relay from any of our recommendations. We did extensive research and found what are the reasons for the failure of a glow plug relay and also which glow plugs relay you need to buy for 7.3 Powerstroke.

When Should I Replace Glow Plugs?

Like any other car, engine component glow plugs do not last forever, and there comes a time when you need to replace them. So when should you replace the glow plugs? Ideally, you should replace the glow plugs when you notice any one of these symptoms.

Difficulty to start the vehicle

The glow plug is essential to a diesel car’s ignition. A faulty plug will be incapable of generating enough heat to warm the cylinder and fire up the engine. Therefore, if you have trouble starting your car or if it takes you several tries, it may be time to replace the glow plugs.

Poor acceleration

While it is possible to start your car with a faulty glow plug, you will experience poor acceleration. You will notice that you do not generate any speed when you floor the accelerator. When this happens, it may be time to change the glow plugs.

A misfire

Exhaust backfiring occurs when the fuel fails to ignite properly with the cylinder. Given the importance of glow plugs in this process, a misfire can be a sign of faulty glow plugs.

What do you do when 7.3 Powerstroke glow plugs are not working?

The best solution to this problem is to replace the glow plugs. When the glow plugs stop working, it means they are faulty, and replacing them should solve the problem.

How much will it cost to replace 7.3 Powerstroke glow plugs?

The cost of replacing the glow plugs on your Ford 7.3 Powerstroke truck will vary depending on whether you are replacing all plugs. For all plugs, the cost can range between $236 and $321, both for labor and the parts necessary.

Are Glow Plugs And Spark Plugs Similar?

In terms of what they do, yes, they are. Both act as the source of ignition in a combustion engine. However, spark plugs are found in gasoline engines such as in 5.4 Triton, and so on, and they also need replacement, while diesel engines use glow plugs. If you want to read more about spark plugs we wrote about spark plugs for 5.7 hemi.

Review Of The Best Glow Plugs For The 7.3 Powerstroke

OEM Ford / Motorcraft Idi 7.3l DIESEL Glow Plug Zd-9- Zf2tz-12a342-a

Please note that Prices and Availability Are Subject To Change

Though a bit pricier than some of the other options you will find on our list, the Zd-9-zftz-12a342-a glow plugs are worth the price. These OEM plugs are designed to be used with a wide array of engines.

Heat up quickly

The higher price tag will get you a plug that heats up quicker than most. The construction of this plug allows for excellent thermal expansion. This will help ignite the engine within a short amount of time.

Ease of installation

We found these glow plugs to be easy to install. This was mainly due to their design. Also, these come in a set of 8. Thus you can install in all cylinders or in a few and use the remaining plugs for when you need to replace them.

One year warranty

A warranty is always a sign of a manufacturer’s confidence in its product. These plugs feature a one-year warranty. This is also a testament to the plug’s solid construction, which means you do not have to replace them frequently.

What we liked

  • The plugs are compatible with a wide range of engines
  • It comes with a one-year manufacturer warranty
  • These plugs heat up quicker than most
  • It has an ergonomic design that allows for easy installation

What we did not like

  • It is offered at a higher price tag than most

ZD-11 OEM Glow plugs from Ford/Motorcraft


Please note that Prices and Availability Are Subject To Change

Designed for ford models built between 1995 and 2003, the ZD-11 set of 8 glow plugs helps heat up your engine. These plugs come packaged as a set of 8 glow plugs, and here is what you can expect.

Eight plugs in the package

When you buy this glow plug package, you get eight plugs. You can decide to hook up all eight cylinders of your engine. Alternatively, you can choose to hook up one or two cylinders and keep the other plugs for when you need a replacement.

Turbo diesel engine compatible

These plugs can be used with the Ford 7.3L turbo diesel engine. As such, they are rugged enough to handle big engines. Also, they offer excellent start-up time even in winter.

Lightweight plugs

These plugs are lightweight and compact. As such, they will not take up a lot of room in your engine, and neither will they weigh down your truck. This is important to get the most out of your engine.

What we liked

  • These are compatible with ford models between 1995 and 2003
  • The plugs heat up quickly
  • They are designed for turbo diesel engine
  • Weighing under 11 ounces, they are lightweight and compact
  • It comes in a set of 8 plugs

What we did not like

  • These might not be the most durable glow plugs based on customer reviews.

Bosch 80028 Glow Plug


Please note that Prices and Availability Are Subject To Change

For a fast warm-up, the Bosch 80028 glow plug should be your go-to glow plug. This plug is offered by one of the most reputed names in the industry. So you can expect quality and fast heat-up.

Duration technology

This is a technology that is unique to Bosch glow plugs. It gives the plugs the ability to reach higher temperatures within a short period of time. This translates to faster ignition of your engine even in low temperatures.

Roll threads plated with nickel.

The threads on these plugs are nickel-plated. This helps prevent seizing and also increases the overall durability and strength of the plugs. Thus you do not have to worry about the plugs coming loose.

Twin Viton seal

Another feature that gives these Bosch plugs a competitive edge is the twin Viton seals. The latter protects the coils of the plugs from damage. They help increase the life cycle of the plugs and protect them from major damage.

What we liked

  • Offers faster heat-up than most thanks to the duratem technology
  • Do not seize easily thanks to the nickel-plated roll threads
  • The twin Viton seals keep them protected for longer
  • These plugs are resistant to damage

What we did not like

  • Do not work as well in extreme temperatures

Ensure E2TZ12A342A Fast Start Diesel Glow Plug (Pack of 8)

Please note that Prices and Availability Are Subject To Change

The Enum E2TZ12A342A fast start diesel glow plugs offer good performance and come in a pack of 8. Thus you can install all at the same time or have seven spark plugs.

Reasonably priced

Compared to some of the other options on our list, these plugs are reasonably priced. Its cost becomes a real benefit when you consider the plug’s quality. These plugs are well constructed and don’t expect to be replacing them soon.

Easy to install

We found these plugs to be easy to install. This was primarily thanks to the design of the plugs. You should have no problems installing these plugs in your engine.

One year warranty

A warranty is always a good sign. This set of 8 glow plugs comes with a 1-year warranty. This should give you the confidence to spend money on them.

What we liked

  • These plugs are reasonably priced
  • The pack comes with eight glow plugs
  • Feature high-quality dual coils that allow the plugs to heat up quickly
  • These plugs get hot quickly and can match the performance of pricier models

What we did not like

  • Only works with 6.9 and 7.3L indirect injection diesel engines.

Frequently Asked Questions

What is a glow plug, and what does it do?

A glow plug is an electric component found in diesel engines. It heats incoming fuel and air that leads to efficient fuel combustion. The latter is what starts the engine. The glow plug is found in each engine cylinder, either in the pre-chamber or the combustion chamber.

How many glow plugs does the 7.3 Powerstroke use?

The 7.3 Powerstroke typically has eight glow plugs for each of the eight engine cylinders.

Will a diesel start without glow plugs or with faulty glow plugs?

Yes, and some diesel engines do not have glow plugs. The same goes for faulty glow plugs. However, with faulty glow plugs, you will notice a difference in performance.

How to check the glow plugs without removing

It is possible to check the glow plugs without removing them. This is done using a multimeter. To do this, you will need to use the connectors that attach to the valve covers of the glow plug. Place the multimeter plugs on the connectors.

Best glow plugs for 7.3 Powerstroke buying guide

What factors should you consider when shopping for glow plugs for your 7.3 Powerstroke? There are several things to consider, and the main ones are;

Check How Fast It heat-up

As already stated, a glow plug’s function is to facilitate fuel combustion that starts the engine. Thus how fast a glow plug heats up will dictate how fast your engine starts. Ideally, you want a glow plug that can heat up in the shortest time possible.

Online reviews should give you an idea of how fast a glow plug heats up.

Durability and quality of material

Glow plugs are inexpensive, with most costing less than $50. However, they are still an investment. And the last thing you want is to keep replacing your glow plugs. Consider a glow plug made from high-quality materials.

Also, glow plugs that cost considerably more than others tend to be more durable. An excellent example of this is the OEM Ford / Motorcraft Idi 7.3l DIESEL Glow Plug Zd-9- Zf2tz-12a342-a.

Warranty matters bro

Sometimes you may get a faulty product, and you may want to return it. Here is where a warranty comes in handy. A warranty gives you the confidence to spend on a product knowing in case of anything, you can exchange it.

More importantly, a warranty shows a manufacturer’s confidence in its products.


Glow plugs are essential to the optimal functioning of the 7.3 diesel Powerstroke. Additionally, glow plugs are inexpensive. As such, these are components you will be able to afford. As for which are the best glow plugs for 7.3 Powerstroke, there are several contenders.

However, for our list, we would have to pick the OEM Ford / Motorcraft Idi 7.3l DIESEL Glow Plug Zd-9- Zf2tz-12a342-a. While it is also the most expensive, its hefty price tag means you get more for your money.

Last Updated on February 20, 2024 by Rifen

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