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  1. General Discussion
    Got an ‘11 LML w/ 250k miles. Has an EFI live tune and everything else is pretty much stock. All I do with the truck is tow my camper and some random miles here and there. Yesterday it just kept cranking with no start. After 15 minutes of cranking on and off it finally started and ran seemingly...
  2. 911 Problems Forum
    So this guy I know that didn’t know what he was doing tried changing his injectors on a LBZ 2007 6.6L. Now the truck will barely idle and is making an awe full noise. Getting a P0193 and a turbo underboost P0299 that was not getting prior to injector swap. Super rough idle. Any help would...
  3. Maintenance
    I have an 04 LB7 and just replaced all 8 injectors with some off brand from rock auto cause I didn’t need to pay a core charge. When I put them in, 2 were faulty. I tried to get warranty on them and the injectors are out of stock… of course. I guess my only option is to put 2 different brands of...
  4. General Discussion
    I am curious to get feedback from the community. I purchased a new 2022 Silverado HD Duramax and it finally came in after months of searching and waiting for it in transit. Anyone who’s purchased a vehicle lately understands the troubles of that in itself right now. I went to pick it up...
  5. General Discussion
    This is in drive #1 -1.4 #2 -3.2 #3 -0.3 #4 3.2 #5 2.0 #6 1.5 #7 -1.9 #8 -0.4 This is in park 0.1 -2.3 0.1 2.2 1.8 1.1 -1.4 0.3 Truck throws P0304 code And hesitates at 45 mph and stability trac light comes on Seems to run and shift fine until about 3rd 4th gear babying it Edge Pulsar v3...
  6. 11-16 LML Duramax Powertrain
    Hello, I headstudded my duramax without pulling heads using a xotic kit. Everything went well coming apart and going back together. However it was on a Sunday night and I don’t have time to finish so had a buddys shop finish putting intake stuff and harness back together. Told me he started...
  7. 11-16 LML Duramax Powertrain
    I have a problem that has gotten progressively worse over the past few weeks. I want to start this off by saying there is no check engine lights nor have I had any. The truck also has 99k miles. What started off as every so often I would notice a loss of power followed by a slight stutter then...
  8. 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...
  9. General Discussion
    I just bought a 13 lml. 155,000 miles. Test drove it all sounded great. After about 300 miles I started hearing a knock, hooked computer up and cylinder 6 balance rate was at -4.2. Changed injector same problem. The noise only comes when the truck it warm or up to temp. I can unplug injector...
  10. General Discussion
    2011 GMC Duramax 2500. I have been getting the engine power reduced message a lot. After driving normal on the interstate or highway, when I pull up to a stop light, the engine power reduced flashes. It does it about any time I slow down after driving, even while hooking trailers and loading...
  11. General Discussion
    Last few months at idle I would have an occasional single hiccup at idle. After a small road trip this past week it sometimes does the hiccup or it goes into a full loping idle with puffs of white smoke. I have a balance rate between +7-11 on cylinder 3 in park when it does the lope. I’ve...
  12. General Discussion
    Ok, so I’ve got a 03 LB7 duramax, with 402,000 miles. it has a kinda rough idle, like it’s missing on a cylinder, with a constant power surge. when you give it some gas, either in park, or going down the road, it clears up and runs great, but it black smokes like crazy. I’m talking about cars...
  13. How To's, DIY and Write ups
    Hey guys, I have a 2014 GMC 2500 with the LML and had the infamous CP4 failure the other day at 118k. Im currently pulling the injectors and got 1-7 done but I'm having a total brain block on how to get the 8th injector high pressure line off the fuel rail without pulling the turbo. I cant get a...
  14. 04.5-05 LLY Duramax Powertrain
    My truck has been leaking coolant and started knocking td I think it could be the injectors but I have no clue
  15. 01-04.5 LB7 Duramax Powertrain
    My truck (2002 LB7 Engine) has been smoking white since I purchased it. It doesn't have a hard start at any temperature, and it doesn't smoke until the engine reaches ~125F. At Idle it will smoke just enough to piss off the guy behind me, and accelerating from 0 it will smoke enough to leave a...
  16. Gauges, Electronics and Wiring.
    Having issues with fuel injectors on a LLY. Have replaced the wiring harnesses,had the FICM rebuilt and the balance rates are in tolerance. Still get fuel injector codes.
  17. 01-04.5 LB7 Duramax Powertrain
    Hello everyone. I know this has been discussed many times, but I can't find my specific issue. Truck is a 03 LB7 with 260k on it. I do the fuel filter religiously every oil change because of these pesky injectors. I have also had to replace the passenger side bank of injectors in the last 10k...
  18. General Discussion
    So I just replaced all 8 injectors all with new cups new high pressure lines new return line bolts. I cleaned the return lines really well. Still feel like I have some fuel in my oil and it’s smoking white after I accelerate. It’s black smoke and then white. I really need help here. Any help is...
  19. 01-04.5 LB7 Duramax Powertrain
    My 03 lb7 has about 15,000 miles since I replaced the injectors and recently has developed a light fuel knock on both driver and passenger side during acceleration. No hazing. Hardly any black smoke on heavy acel. It’s not incredibly noisy but I can hear them. I’ve been running a good amount of...
  20. General Discussion
    I am a recent owner of an 04 2500. I quickly found out about the dreaded d-max injector problem. I checked back with the dealer that I bought it from for warrenty info and was told about the 7 year 200000 mile warrant. But as my luck goes, the seven years expired before I bought it. 150,000...
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