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Discussion Starter · #1 ·
I have a lb7 duramax smoking at idle. I noticed the x66p stuff is discontinued and is outrageous online. What is everyone using now days to clean their injectors??
 

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Depending on how bad an injector or injectors are, cleaning will only temporarily fix the issue. The X66P stuff only helped me out for a month if that and the hazing was not even that bad compared to most. You can try pouring an entire bottom of diesel fuel additive to see if it will help. The only way I fixed mine was replacing the injectors.
 

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Discussion Starter · #3 ·
I’m sure they need replaced. I just wanted something to get me by for the next couple months before taking it in
 

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Discussion Starter · #4 ·
I just bought the truck earlier this year and supposedly the injectors have been replaced before but I’m not sure when they was replaced.
 

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I have a lb7 duramax smoking at idle. I noticed the x66p stuff is discontinued and is outrageous online. What is everyone using now days to clean their injectors??
Cleaning is a bandaid at best, the injectors will need to be replaced if they are sticking. However i have limped a truck along for quite a while by running biodiesel + a good additive. that said, if your injectors are sticking open, you run the risk of engine damage from cylinder washing and oil dilution. In my case, the injectors were not sufficiently damaged to stick while running that fuel so it was fine, but if your still getting hazing / smoke the injectors are not going to come back in spec.



I just bought the truck earlier this year and supposedly the injectors have been replaced before but I’m not sure when they was replaced.
Its a ~50K service item on the LB7 trucks on average. Some last longer, some less. I was around 160K on mine but i was among the very lucky, and i did nurse them along for a lot longer than i should have.


Edit: Since im sure this is going to because a highly subjective thread ill add this now. Do not run transmission fluid in the fuel, some people will tell you to do this because the detergent package in the ATF is supposed to clean the injectors out.... no, just no. ATF is not designed to burn, it is in fact specifically designed to resist burning, it should not be run in an engine for any reason. 2 stroke oil, while it does burn, has not been shown to significantly improve diesel lubricity in tests, and IIRC had a negative impact on some. the same goes for other oil additives, marvel mystery oil and the like. Dont go dumping oil in your fuel to make it slicker. use a good quality additive like optilube, diesel kleen, or stanadyne depending on availability.
 

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I have a lb7 duramax smoking at idle. I noticed the x66p stuff is discontinued and is outrageous online. What is everyone using now days to clean their injectors??
When you replace the injectors and see all the crap built up on the high pressure side you will see why no amount of cleaning will work. Just image search LB7 clogged injector. 4 out of 8 of mine were so clogged up I have no idea how it even still ran AND I had no symptoms of bad injectors except fuel in the oil. So I'm sure I had a cracked body or leaking returns also. If it were up to me I would go with S&S SACXX injectors the SAC design helps to reduce injector problems. You can get them from Lincoln. When I replaced my injectors I didn't even start the truck until I had my Kennedy lift pump and mega filter installed. After seeing all the junk inside the HP side there is no doubt in my mind that filtering (besides the OEM filter) will help extend injector life.
 

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If you are going to replace them anyway, try Hotshot's Secret Extreme Diesel. I was getting ready to replace my injectors on my LLY, had one that was getting a little knocky and put 8 oz of this stuff in on a fill and truck runs quieter, smoother, more power and it looks like my fuel economy has increased a little by the second fillup. Going on over 500 miles now. No, I don't sell this stuff but I was truly amazed. I have always used Howes, DK, Stanadyne, Lucas or Optilube at every fill and nothing has worked like this stuff. I think I bought it at Auto Zombies.
 

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Discussion Starter · #8 ·
I might try the hot shots just to see if it will do anything. I gotta go on a small road trip this weekend. I’ve tried diesel Kleen And have used it since buying the truck and it still smokes at idle. It started smoking at idle a couple months ago but last time I took towed my boat with it I noticed it seemed worse.
 

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Discussion Starter · #9 ·
Can’t really afford to replace them already but I guess I probably have no choice. I did find a place to do it for 3200 for Bosch remains so I might go with that. I’m gonna take it in a couple weeks and have them look at the balance rates and stuff
 

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Can’t really afford to replace them already but I guess I probably have no choice. I did find a place to do it for 3200 for Bosch remains so I might go with that. I’m gonna take it in a couple weeks and have them look at the balance rates and stuff
Lincoln has brand new Bosch injectors for $2074, reman Bosch for $1699 and new S&S SAC00 injectors for $2700. Maybe just get a quote for labor and supply your own injectors? When I saw the price difference between New Bosch and reman Bosch and new S&S I just bit the bullet. Is there anything stopping you from doing it yourself? You could get the master kit and brand new injectors for cheaper than your quote. Where do you live?
 
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Discussion Starter · #12 ·
I’ve thought about doing it myself. I was thinking the kit from Lincoln diesel costed more than that with the new gaskets and everything else needed. I live in Oklahoma
 

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Cleaning is a bandaid at best, the injectors will need to be replaced if they are sticking. However i have limped a truck along for quite a while by running biodiesel + a good additive. that said, if your injectors are sticking open, you run the risk of engine damage from cylinder washing and oil dilution. In my case, the injectors were not sufficiently damaged to stick while running that fuel so it was fine, but if your still getting hazing / smoke the injectors are not going to come back in spec.


I have seen this before but I don't understand. How does an injector that is sticking cause oil dilution? I'm not saying it doesn't because I know it does I just don't understand how.
 

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Cleaning is a bandaid at best, the injectors will need to be replaced if they are sticking. However i have limped a truck along for quite a while by running biodiesel + a good additive. that said, if your injectors are sticking open, you run the risk of engine damage from cylinder washing and oil dilution. In my case, the injectors were not sufficiently damaged to stick while running that fuel so it was fine, but if your still getting hazing / smoke the injectors are not going to come back in spec.

I have seen this before but I don't understand. How does an injector that is sticking cause oil dilution? I'm not saying it doesn't because I know it does I just don't understand how.

In a normal cylinder fuel is only sprayed at the top of the compression stroke and it is burned at the top of that stroke so there is very little liquid fuel in the cylinder. When the injector is spraying constantly as it will when stuck open you get liquid diesel on the walls of the cylinder during all 4 strokes. This washes the oil off the walls of the cylinder accelerating wear, and the fuel will slip between the rings and into the oil. Granted you will not make oil like you will with a cracked body, but you can start to contaminate the oil with more fuel than would be normal.
 

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In a normal cylinder fuel is only sprayed at the top of the compression stroke and it is burned at the top of that stroke so there is very little liquid fuel in the cylinder. When the injector is spraying constantly as it will when stuck open you get liquid diesel on the walls of the cylinder during all 4 strokes. This washes the oil off the walls of the cylinder accelerating wear, and the fuel will slip between the rings and into the oil. Granted you will not make oil like you will with a cracked body, but you can start to contaminate the oil with more fuel than would be normal.
I bet that is what was wrong with my injectors then. I was not making oil to the point where I could even notice it on the dip stick, just had fuel contamination. But I figured since I had fuel in the oil it had to be return lines or a cracked body. That is good information to know. Thank you for explaining.
 
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BMW cleaner

I have a lb7 duramax smoking at idle. I noticed the x66p stuff is discontinued and is outrageous online. What is everyone using now days to clean their injectors??
You can use the bmw injector cleaner, same as the x66p. But it is a band-aid. I did it, no smoke for a couple of weeks, but it is smoking again.
 

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You can use the bmw injector cleaner, same as the x66p. But it is a band-aid. I did it, no smoke for a couple of weeks, but it is smoking again.
once the injectors wear down to the point that they start to stick, if you break them free and get them working with an additive or cleaner, you pretty much have to keep running that additive (or some additive) to keep them from hanging again. Replacement is inevitable, only bandaids come in a bottle.

That said, i milked another year or two out of my LB7 injectors with a healthy dose of bottled bandaid #1 so i cant really say much >:)
 

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Bio diesel still is the best overall fuel system cleaner and injector lubricant. Only caveat is the first time u use it it will clean the inside of your tank and likely clog the fuel filter.
 

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Bio diesel still is the best overall fuel system cleaner and injector lubricant. Only caveat is the first time u use it it will clean the inside of your tank and likely clog the fuel filter.


There is a good chance depending on the state of the tank and fuel system. May as well throw some algaecide (BioKleen or similar) in there while your at it, since you'll likely be throwing the next filter or two away anyway.
 
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