Fixing an Injector Problem in a Chevy Duramax Diesel | TruckU Tech Tips 

My LB7 is a CA version with EGR blanketing the passenger valve cover that added a whole new layer (no pun intended) to the lengthy, miserable injector job.😟 While problems with the injector check ball and seat can produce high balance and return rates, usually presenting as long crank times (since the CP3 has difficulty generating minimum rail pressure) I believe the fundamental issue with LB7 injectors was use of VCO nozzles, vs SAC type, which came in with LLY and all later Duramax.The VCO's have a different sealing design and as they wear, eventually begin to dribble, causing coking at the nozzle which results in a poor spray pattern, loss of mpg and smoking at idle. Think about it for a minute: what do high return rates have to do with smoking at idle? High balance rates however, can be a function of nozzle spray pattern and leaking at the tip, which will effect balance rates as the FICM tries to balance cylinders. Of course, whenever LB7 injectors become problematic, it don't make no nevermind what has failed, since they need to be replaced anyway. A/C Delco injector cleaner, directly into the fuel system (not the tank) will buy some time, but once smoking begins (at about 75k intervals) it's downhill from there. Excellent advice on R&R of HP lines. No amount of DIY cleaning will restore them, and it's the micron level (almost invisible) particulates that can act like grinding paste inside injectors. I see you pried off the upper valve cover. Another way is a block of wood and a 5# hammer, beginning at the top of each end. Sounds scary, but the cover will quickly "pop" and come off. We disagree on one important item, however. Why remove the water separator on the fuel filter? 😱😱😱 Dodgy fuel can have water in it and although we all try to buy diesel at busy stations with high turnover, even the best suppliers can inadvertently introduce water into their fuel. And at 25,000 psi, water is a really good cutting product. And don't get me started on corrosion. Stay with the OEM filter! ACD and GM cooperated closely on the design (dual media to prevent loading of the finer filter) following the injector fiasco you mentioned and all Duramax now use that filter (made for them by Racor). Time to get off my soapbox! Thanks for the video 👍👍👍.

The little steel lines usually don't have any rust or junk because their constantly under varying pressures. When I remove them I just blast then with brake clean and compressed air b4 reinstallation.

$5k 6 years ago. I was quoted for about $13k in 2023. Cp3 was included

I have the LMM. Do you need to do any programming when changing injectors? or is it the R&R?

Do you guys a shop in orlando florida that work with lmls.

Why not clean the injector lines out with carb/brake cleaner?

Ok I got a question he said it's hard to start an white smoke this smoke in this video is not much right now my lbz got alot of water an gasoline in the tank an it is ticking but it starts good idles rough an puts out way more grey an dark grey smoke then what's in this video o y'all think it's the injectors or something else not one problem ever untill the water an gasoline an yes I did drain everything an clean an blew out all lines tried unplugging one injector at a time to see if it made a difference an nope it didn't

What torque wrench are they using in this video? I like the beep when it reaches correct torque. Reading reviews on Amazon is mind numbing...was looking for a personal recommendation.

Hey guys, how do I connect a small screen like the one in that Chevy displaying live information about my truck's diagnostics. I would like to keep track of my injector balance rates. I recently got a 2006 LBZ Duramax.

I just heard that Merchant no longer offers "service"... only parts!

What’s the different between Bosch and boschtech.

Are you guys working on the wrong side of the engine just because its easier for demonstration purposes or do you not know that cylinders 2 4 6 8 or actual on the driver side of a duramax

Shotgun repair , "just replace them all" way to toss a wallet at it guys.

This cars the worst I ever worked on. A shop wanted $9,000 to fix the problem. When getting the parts myself, I had to get a CP3, Injectors and its parts and other items. It cost me over 3k in parts to get the car right...and to think, itll only last me 60-90k miles and do it over again... I travel a lot and put 35k per year. Means I will use $3k every 2 years....My car has its injectors changed twice already...and it only has 108k miles.

What a joke GM is. 100k and it needs new injectors. POS.