5 Best Injectors For LB7 Duramax Reviews

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A good fuel injector can make a night and day difference in the way your vehicle drives. It not only helps in smoothening out the drive but improves power and mileage.

You get better combustion which leads to better throttle response. This fact applies to all engines, including the ones that Ford uses.

This is the reason I have compiled a list of the best injectors for LB7 Duramax, which will boost the efficiency of it by a huge margin.

You will never be able to go back after using the ones I am mentioning here. So, without any further ado, let’s get straight into it!

5 Top Rated LB7 Duramax Injectors Comparisons

Bosch Automotive Injectors

Bosch Automotive Injectors

Duramax LB7 6.6L Diesel Injector

Duramax LB7 6.6L Diesel Injector

Reman Auto Electronics 6.6L Duramax Fuel Injector

Reman Auto Electronics 6.6L Duramax Fuel Injector

XI CAI JIE Remanufactured Replacement Injector

XI CAI JIE Remanufactured Replacement Injector

Sinister Diesel Reman Injector

Sinister Diesel Reman Injector


1. Bosch Automotive Injectors

Bosch Automotive Injectors

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11/10/2023 08:13 pm GMT

Coming up in the first place is a product by perhaps one of the excellent brands out there if you want to buy auto parts.

So, those achieving the top spot speak for themselves. They have made a solid reputation in the sector, and these injectors say no different.

If you have an LB7 Duramax from 2001 to 2004, this Bosch Automotive Injector is the excellent option available out there.

It has been designed to have an OEM fit, which means that there won’t be any extra tools required other than changing the stock one.

Unlike other options on the market, no core charge is required, which means you don’t have to return the old one you just replaced.

There will be no hassle related to shipping and getting the money back. These injectors serve a dual purpose.

They improve engine efficiency, but they also get rid of all the problems of the stock ones, such as the cracking issue.

You also don’t have to worry about the erosion of the chrome-plated ball seat. You also get all the installation material necessary, such as washers and O-rings.

Moreover, the brand also recommends users replace the return line seals and the cover gaskets for the lower valve, which will allow you to get the most out of your engine.

Although it is not required, it is recommended to do so. They also provide a two-year warranty; any fault arises during the product’s usage.

Under the rare scenario that it does, you are eligible to get free of cost replacement.

The only negative aspect of this amazing product is that you have to spend more than the usual amount of money to get a hand on these bad boys.
  • Have an OEM fit
  • 2- year warranty
  • No issues such as cracking or erosion
  • No core charge
  • Expensive

Well, they are expensive, but these Bosch injectors are definitely worth the cost. They have been proven to be durable, strong, and a considerable upgrade over the stock one.

2. Duramax LB7 6.6L Diesel Injector

Duramax LB7 6.6L Diesel Injector
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In the second place, coming up is a product that various websites recommended despite it not having so great reviews.

So, I dug a little deeper into why people have such conflicting reviews about it and narrowed it down.

Let me guide you through the working of this product, so you can see if it is a good fit for you. Unlike the Bosch injector, this Duramax LB7 6.6L Diesel Injector does have a core policy.

This means that you need to pay the core charges upfront, which may or may not be refunded back to you, depending on the condition of your replaced one.

Cosmetically, it should be as good as brand new. You may get a partial, full, or no payment at all.

The company guarantees a $50 refund if you send back the core within a month of buying the new one.

Another thing to notice is that this product has very few reviews from actual buyers. Yes, they were reviewed by other guides, but that does not translate into how it performs in real life.

The manufacturer assures you that the build has been reinforced, so it will not be prone to any cracking.

You also get all the required O-rings needed for installation. The rings come with a one-year warranty too, in case they fail on you.

Lastly, unlike the Bosch ones, which are brand new, these have been remanufactured, meaning they are refurbished of some sort but without any of the original ones’ problems.

The fact that they are rebuilt rather than new, and you have to send your old part in to get the refund, some people don’t agree with.
  • Cheaper alternative
  • Reinforced design
  • One-year warranty for the O-rings
  • Have a core charge
  • Are remanufactured instead of being new

If you are looking to save a few bucks, then these Dieselogic injectors are for you. People did not have any complaints despite it being a rebuilt one.

3. Reman Auto Electronics 6.6L Duramax Fuel Injector

Reman Auto Electronics 6.6L Duramax Fuel Injector

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At third number we have another remanufactured injector. To be honest, I did not know that people prefer rebuilt ones as much as brand new injectors.

And that is not only due to the cost. It is because these injectors have excellent performance, just like this one by Reman Auto Electronics.

This product has been designed to ensure you get better than stock performance and durability than the preinstalled one.

The new nozzle which has been used allows for a 30% better flow over the original one. That is not all! They have also replaced the control valve alongside the seals and the O-rings.

The manufacturer guarantees an up to 60HP boost after replacing it with this one. They also come with a core policy.

The brand clearly states that they will refund up to $150, given that the received product is in good condition and without any faults.

If they do not receive the old injector within 30 days, they will charge your credit card. If you do send it to them, then that amount will be refunded back to you.

They give a grace period of one year for you to send them the core, after which you will no longer be eligible for the $150 refund.

These also have a two-year warranty to ensure the product you receive is completely defect-free. If there are any faults, then you can get a replacement for free.

The only drawback is that there are not enough reviews of this product online to ensure it is good for you. Buying it is a risk, which may or may not turn out to be a good decision.
  • Remanufactured in the USA
  • New nozzle with 30% more output
  • New seals and O-rings
  • Up to 60HP boost
  • Fewer reviews

Although it is a risky buy, this rebuilt injector does come with a two-year warranty.

This means that if you are worried about the product you received has any faults; you can buy it with complete peace of mind. You get a decent performance boost over the previous one.

4. XI CAI JIE Remanufactured Replacement Injector

XI CAI JIE Remanufactured Replacement Injector

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Taking up the fourth spot is another product by a relatively unknown brand.

But the fact that it made it to the surface for some guides to review says that it is a product that deserves your attention.

So, let’s dig a little deeper into how XI CAI JIE made it on this article!

They guarantees that every unit has been inspected with 114% assurance that it will be perfect for your use.

I don’t know how they got that number, but they did mention it, which means they are confident in their product.

The manufacturer also guarantees that you will get the excellent quality which will provide you with better efficiency.

The thing that helped it earn a place is that it comes with a warranty of not one, not two, but a whopping fifteen years.

This means that you can rest assured this fuel injector will not break on you, nor will it cause any problems.

Well, if it does, then you have the warranty, which guarantees a free-of-cost replacement.

Moreover, the parts used are of high quality, which will improve the flow of fuel at a decent rate, which will not leak.

This is prevented by reinforcing the design with heavy-duty steel. The new seals that are installed on this product also help in lowering the change of leakage.

There is no proper information about these anywhere online, so being an unknown brand, with no support to back up their claims, this is a decision that may have more downsides that you may expect.
  • Exact OEM specifications
  • Reinforced with heavy-duty steel
  • No carbon build-up and cracking
  • Fifteen-year warranty
  • No reviews at all

Given that there are not many injectors available on the market for the Duramax LB7; I had to review the ones I thought would be the best.

This one by XI CAI JIE made it to this article for this sole reason. The 15-year warranty makes it a lifetime one, which any other brand on this article cannot match.

5. Sinister Diesel Reman Injector

Sinister Diesel Reman Injector
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11/10/2023 01:48 am GMT

Although this list is short and does feature products that may be risky to buy, if they do turn out to be what the manufacturers advertise them to be, you can rest assured that there is no brand out there to defeat them.

A similar thing can be said for the fifth and final product, the injector by Sinister Diesel. They label their product as being the perfect replacement injector for the LB7 Duramax.

It is not only reliable but cost is way less than buying a new injector. The manufacturer also guarantees that their product will meet or surpass OEM requirements.

In layman’s terms, you are getting a steal of a deal with these that will get you the performance upgrade you want and give your engine a new lease on life.

What makes Sinister different from other brands and more similar to Bosch is that they recommend on their website to make changes accordingly to ensure you get maximum fuel efficiency from the system.

Moreover, they advise you to replace the high-pressure fuel line and get a new filtration system, which works parallel with the injector.

Then you will not have any complaints or issues regarding decreased fuel efficiency or lesser than usual performance. The core charge of $175 is also present on this one.

So, you can send it to them and wait for confirmation or include the charges in the price you pay upfront, which will be refunded if the item they receive is inacceptable condition.

There are not many reviews!

The website does have a review section, but it compiles a list of all of the ratings they have received for all products, and none of them were related to this one.

  • OEM design
  • Advises you to replace the fuel line and the filtration system
  • Decent performance upgrade
  • Fewer reviews
  • Core charge hassle

The Sinister brand assures potential buyers that their products are top of the line and will blow their minds.

Well, unless there are more reviews of their products on the internet, none of the claims can be put to the test.

Frequently Asked Questions

Q1. How Do I Know My LB7 Engine’s Injector Is Failing On Me?

This checking can be applied to all sorts of injectors.

You may have noticed engine anomalies such as slow acceleration, the engine idling at high RPMs, overheating, white smoke, and knocking sound too.

All of these issues suggest that there might be something wrong with the fuel injector. But that cannot be the only cause of the issue.

It is better to get your vehicle checked by a professional so he can identify the issue.

The engine has a history of its injectors failing on it around the 100000-mile mark, although some people experienced it much quicker.

If you start noticing the same symptoms, you must be prepared to decide if you want to buy a new or a remanufactured one.

Q2. Which One Should I Buy A New Injector Or A Rebuilt One?

Now that is the million-dollar question. According to my research, remanufactured and new products generally have similar performance.

Unfortunately, the same cannot be said for all of the five I mentioned here.

Let’s take the Bosch injector for reference!

I recommend the best, not only because it is new, but also it has no negative reviews. The only one that can be compared with it is the Dieselogic injector which earned the second spot.

It has more reviews than the other three, and people have no complaints about it except for some things like it has been rebuilt and has a core charge.

The only advantage of such an injector is that it is considerably cheaper than new ones. And then you get an additional discount if you trade in your old one.

Both have their ups and downs, but I would suggest that you save up some money and buy brand new ones.

Q3. Why Should I Get A New Injector For My Engine?

Normally, vehicle engines go a long time before requiring any sort of repairs, including injector ones.

The LB7 has a different story. This engine has many faults, one of the more common ones being that its fuel injector broke very easily.

This led to it spraying more than the adequate amount of fuel in the engine, which gives you unreliable performance and decreased fuel efficiency.

You will also contribute less to air pollution along with better performance. So, you get the best of both worlds by changing the injector if needed.

Q4. How Do I Change A New Injector On My LB7 Engine?

If you are looking to save some money by not going to the mechanic, you are making the right decision. Installing a new fuel injector is an easy task.

There are various tutorials on the internet and on YouTube, which walk you through the process in a step-by-step fashion, so you know what you are doing and what tools you will need.

An added advantage is that you get to learn a new thing which also helps in saving money.

Q5. Do All LB7 Engines Have Injector Problems?

This question has been asked by many people online. Let me give you a brief and concise answer. The injector issue has been present in all of the LB7 models.

But it was very common in the earlier ones, rather than the late ones. The brand did try to fix the problem but could not eliminate the problem.


What are the reliable injectors for your LB7 Duramax? Let's find out

Well, there you have it, a compilation of the best injectors for LB7 Duramax, which were chosen from a pretty shortlist to start from.

I can guarantee that for each and everyone who made it on this article, there are no other options that can defeat whatever these brands are offering.

If I had to choose one out of all five, then the clear winner and my recommendation would be the Bosch Automotive Injectors.

They are the ones that designed the original injector, so it is the appropriate decision to buy the new and improved design from them.

They guarantee a reinforced design with better durability. You don’t have to worry about any faults as manufactured products can never take on brand new ones.