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  1. 01-04.5 LB7 Duramax Powertrain
    02 Sierra 2500HD, first duramax I've owned and bought back in October 23'. Been really good, drove to wyoming from Colorado several times in all kinds of conditions, until recently she started hazing out the exhaust, I know that typically means injectors took a sh!t and was kinda prepared for it...
  2. General Discussions
    New to the Forum, but im searching for fuel system related questions and im coming up short. I have a late 2003 LB7 with 215k miles, i just started white smoke and has a single of black smoke on start up. i have not checked balance rates but im fairly certain its injector issues. I have decided...
  3. General Discussions
    Hello all, I am looking at buying my first diesel truck, a 2002 LB7. I’m not familiar with Duramaxes, but I am looking to expand my knowledge out of the LS world. The truck in question has 320k on it and I have the opportunity to pick it up for a fair price. It’s a bit of a drive, so before I...
  4. General Discussions
    truck is a 2005 GMC 2500HD LLY 5spd Allison, not tuned to my knowledge, cold air intake, egr delete and 5” straight pipe from down pipe back. Just bought the truck a couple months ago with 270k, displays 1400 engine hours but I know that cannot be trusted. I’ve put on around 5k highway miles on...
  5. 04.5-05 LLY Duramax Powertrain
    Hey all. I have an 05 lly 05 gmc sierra. truck has 382,000kms The other day I was driving and came to a stop at a light and there were puffs of a blue whiteish colour of smoke. Truck still has lots of power. I have a p0304 code, only smokes at idle for a couple seconds after driving and then it...
  6. 06-07 LBZ & LLY Duramax Powertrain
    Hey new to the forum and semi new to duramax engines. I haven't had my 07 gmc 2500hd very long. I recently sent the injectors to injectors so-cal and had them rebuilt. When I bought the truck it had an edge programmer but I removed it when I was having injector issues thinking it may have caused...
  7. 07.5-10 LMM Performance Parts Discussion
    I just bought brand new S & S 60% over injectors. The shop advised me I shouldn’t drive it without tuning it first. I do plan on having it tuned eventually but I guess my question is do I need to? Is it going to tear something up if I don’t have it tuned and I drive it?
  8. 911 Problems Forum
    So this is the second time this code has popped up on my truck. I’ve had injector leak codes for other cyl in the past but it was an external leak from the return lines. This time there’s no external leak. What should be my next steps moving forward? I think there may be a slight knock but I...
  9. General Discussions
    UPDATE BLOWN HEAD GASKET!!! 6000.00 BUCKS TO REPLACE, WHICH I DO NOT HAVE. TRUCK IS IN GREAT SHAPE, NEW BOSH INJECTORS, GOOD TIRES, VERY CLEAN. ABOUT 320.000 MILES ON HER. WHAT DO YOU THINK SHE IS WORTH?? ANY IDEAS? I JUST FOUND OUT ABOUT THE HEAD GASKET AND NOW MY HEAD IS ABOUT TO...
  10. General Discussions
    So I have found a good deal on an S475/96/ 1.32 T6 Borg turbo and I really want to run it as a big single. What do you guys think of that as a big single and what size injectors do you need to spool that turbo? I was thinking of a stroker 12mm fuel pump and all of the HSP plumbing. What else...
  11. Maintenance
    I am curious as to how to tell what my injectors are. Previous owner says new injectors were installed but he doesn’t remember what size they are… I can tell they are definitely not stock. Any help would be much appreciated!! LMM Duramax
  12. 01-04.5 LB7 Performance Parts Discussion
    So I’m looking for injectors… does anyone have any reviews on “getinjectors.com” otherwise same place as “Diesel Injectors So Cal”by chance? They just have reman injectors with the option of bigger nozzles is all but it’s a decent price.
  13. General Discussions
    So this started about a week ago. Under load before the turbo spoils the truck makes a crazy knocking noise and goes away once I hit full ish boost. I’m new to forums and I’ve been looking for solutions this time. I just put a new fuel filter in yesterday and that didn’t help. I’ve run 4 tanks...
  14. EFI Live
    Just as the title implies, I have been tuning stock trucks for quite a while now and need to dial back 45 overs in my personal LB7. I've scoured the forums and found a decent amount of info on this, about pulling 100us, because of injector latency, subtracting the percentage larger your...
  15. 06-07 LBZ & LLY Performance Parts Discussion
    So I just recently bought a 2007 Chevy Duramax with the LBZ in it. On the list of mods were S&S 60 over injectors. I’ve been driving it for a couple weeks now and it seems to run and drive fine, just made it across country from Indiana to California no problem. The injectors seem to be ticking...
  16. 911 Problems Forum
    Hey, I’ve recently purchased a 2002 gmc Duramax and I believe I need to do injectors/cups. I recently had been getting a lot of white smoke sometimes. Usually just when driving on higher tunes. A few mornings ago I went to start my truck and it cranked over a few times and then locked up almost...
  17. General Discussions
    I have an 05 LLY that I recently purchased from down south. The trouble I'm having is I have a pretty good miss. I'm having codes pop up for injector 8 open circuit but I've replaced the FPR and the injector itself but still no bueno. It differs from others because the truck doesn't go into...
  18. 01-04.5 LB7 Duramax Powertrain
    My truck (03 Lb7) hasn’t ran a whole lot since I bought it last year. But I’ve finally gotten it on the road. I’ve always had the issues with when starting it, it would shoot like misty white smoke until it warmed up, the occasional blue smoke. But now it’s like puking up white smoke until it...
  19. General Discussions
    So I am looking into getting the SAC 45's (since the SAC00 are no longer available) and I am wondering if I am going to need to upgrade my lift pump for these bigger injectors. The truck is completely stock and it has an EGR so I don't know, if going with bigger injectors, is there is anything I...
  20. 06-07 LBZ & LLY Duramax Powertrain
    So i bought my first duramax, about 3 weeks ago, lbz, 5” straight pipe, not deleted, stock intake with top cut out (weird i know), and a 7 position switch tuner. well got it home, ran fine until i put about 400 miles on it and then it started fuel knocking. figured i had 1 or 2 going out because...
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