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  1. General Discussion
    So I have an 03 lb7 duramax with roughly 340,000 miles on it. It’s got a bunch of work done to it... transmission, glow plugs and (Bosch OEM injectors) were replaced about 40,000 miles ago. I bought the truck back in March so these repairs happened before I purchased. Truck ran pretty fine...
  2. 07.5-10 LMM Duramax Powertrain
    Hey guys. I'm new to this forum but not new to duramax issues unfortunately. So about 2 weeks ago I put new big injectors into my LMM. I have not been able to get it to fire up since. I have an engine starter on the battery and it will sit there and crank with no fire forever. I've replaced...
  3. 04.5-05 LLY Duramax Powertrain
    I have a 05 lly, had new heads and injectors under 40k miles ago. Started it after I let my wife drive it one weekend 🤦🏼‍♂️ And it’s got fuel knock from hell. Cleared codes and it ran smooth as a whistle for over 120 miles and then throws codes p207, p2146 and p1293. Balance rates on 1,4,6,7 are...
  4. Aftermarket Mods.
    Hello all the plan is to make over 1,000 horse power on my lml soon i want to make at least 850 by the end of this summer but im trying to put together a mod list i was thinking probably a 12mm cp3 swap and 100 over injectors but i really hate buying parts twice so do i need to go 14mm pump and...
  5. Diesels
    When weather gets below 32 degrees my 2015 Duramax will idle rough and not run good till it warms up. I checked it while running rough and 1 & 4 injectors showed not working like the rest. I know they are grouped together so has anyone had any problems like this?? When truck warms up it runs...
  6. Vehicles For Sale
    This will be a long one. Please read all of it. I have had this truck since new in 2007 and put just about every mile on it driving the country from worksite to worksite. I did not haul heavy equipment. Only occasional 25ft travel trailer. I hate to be selling but I started on repairs to it 2...
    $20,000 USD
  7. General Discussion
    To make a long story short, ive had a low power problem for a while now with no codes. I’ve done multiple boost leak tests, no leaks. With my snap-on scanner, if I watch the actual vs. desired FRP, they both follow each other respectively without deviation. The only thing I noticed was as I...
  8. Introductions
    I have a 2015 lml been having issues since frame replacement after wreck. At least that's when the problem started about 30 days after frame replacement. It all started when it got super cold in Texas last February. Driving on a incline at about 1750 rpm the truck hesitates just a little bit...
  9. General Discussion
    So i have a 2004.5 lly, 292k was running ok but rough idle slight haze after long trips, balance rates ok except #3 and #5, replaced injectors with Reman Bosch injectors, now she idles good much quieter and smoother good steady acceleration, good balance rates in drive but they wont read in park...
  10. 01-04.5 LB7 Duramax Powertrain
    Hey guys, I have a 01 lb7 I need injectors on. I want to go with industrial injection Bosch remanufactured 50 over performance injectors. I daily the truck and want to know if I will be all good with these. I already have an air dog lift pump, brand new cp3, Efi live 5 tune, batmowheel and full...
  11. 01-04.5 LB7 Duramax Powertrain
    To make a long story short, I have noticed a lack of power along with lots of smoke upon acceleration in my LB7. I have checked the balance rates along with the fuel rate, but I’ve read different articles saying different things. I would just like to be sure as I need this truck for work and...
  12. 01-04.5 LB7 Duramax Powertrain
    I’m new to the forum and duramaxes. I may be in the market for an lb7 in the future. I know there were injectors issues with the lb7 and I wanted to know how good remaned injectors r. If I buy a truck it’ll be higher mileage (probably close to 200k maybe a little more) and will definitely have...
  13. Introductions
    I changed the injectors all out and cleaned the fuel line. Now the truck will turn over but not start. I loosed the fuel line on the fuel rail on the passenger side closest to the firewall but cannot fuel to come out. I have an AirDog lift pump and it is whirling like normal. I do have fuel at...
  14. Introductions
    Alright, another lb7 injector question. I have a 2002 Chevy Silverado 2500hd with the lb7 Duramax and 130,000 thousand miles. Once it’s warmed up it knocks at idle I had the man at Autozone plug his Snap-on into it and check my balance rates. In park number 1 was running 9 to 10, number seven -4...
  15. 01-04.5 LB7 Duramax Powertrain
    Hey guys. I just installed new injectors on my 2003 LB7. I was not aware until after putting everything back together that you want to purge the cylinder heads of anything non combustible as to prevent hydro locking. Am I able to still do this with the injectors installed? Can I just pull the...
  16. 01-04.5 LB7 Duramax Powertrain
    Sup guys I have an 02 Lb7 with a new motor and a couple mods, pretty reliable rig. Recently I have been seeing balance rate fluctuations on my injectors that make no sense. I keep a close eye on injector #8. Throughout the day, I’ll see My injector climb all the way to +15 while in park, and...
  17. 07.5-10 LMM Duramax Powertrain
    So I ordered a full set of Bosch factory "new" injectors, not rebuilt. When they came they were wrapped in bubble wrap with Injectorsdirect.com tape on them. No Bosch packaging at all. It just seems odd that they wouldn't be in Bosch packaging. Is there any way you would visually be able to tell...
  18. General Discussion
    Just got done replacing my fuel injectors in my 2009 GMC duramax, I haven't found much info on this job so I thought id start a thread if anyone needs tips. I can post basic steps upon request, but I wanted to recommend a few things that I learned as I went. Cleanliness is key, wash, blow air...
  19. Introductions
    just recently copped my dream truck I absolutely love it and I find joy in learning more about diesels. Here’s what I know is done to it from a performance stand point: almost everything on replaced but too much to list Brand new 6.6 Jasper Duramax Motor (ARP studs) -Upgraded Crank Shaft -Built...
  20. Introductions
    Hello Forum. I've been a member for a few years, but have used this forum a lot since buying my LLY in 2011..This is my first post... You guys have helped me fix some things my self or at least helped me be able to discuss intelligently with "experts." There aren't many diesel mechanics in my...
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