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  1. 01-04.5 LB7 Duramax Powertrain
    I have had a coolant leak going on a few months now and it has gotten to the point where it will not hold coolant at all. Finally found the hose that came disconnected. Can anyone tell me what part is missing in the connection? Will attach pictures
  2. General Discussions
    What is the true value of a 2006 LBZ duramax clean no rust, basically unicorn truck, all the options, with 50k miles? Some ones you find on classic truck traders want close to 50 grand. What do these things really sell for? 30?
  3. 01-04.5 LB7 Duramax Powertrain
    Question for the Duramax experts. I’m aware my LB7 needs injectors or injector return lines 100% due to the Excessive amount of diesel that gets into the Crankcase. The truck has blow by when there is diesel in the oil. (not driving it) but when you change the oil and it’s not diluted it has 0...
  4. 01-04.5 LB7 Duramax Powertrain
    Question for you guy. My LB7 Is getting fuel in the Oil not a lot but enough to notice it on an oil change and obtain some blow by from thin Oil. The truck doesn’t haze or idle rough it does have a longer crank when it’s hot. I was wondering if it was okay to drive it until I can afford to do...
  5. EFI Live
    Does anyone have a stock lb7 tune or happen to know the parameters for a stock tune so I can build my own?
  6. EFI Live
    So im having a issue with my 03 LB7, i got a autocal from Sunny Diesel and a DSP5 switch. Full flashed the DSP5 Tune file from the Tuner and installed the switch correctly into the ECM Pins 49,69. Double and triple checked connections and ohms and voltage tested switch and its in range and...
  7. General Discussions
    Hey guys, after some knowledge about the pcv system on my lb7, i am currently putting engine back together with an lbz block as the damage to mine was prety bad and these engines arent easy to get hold of down in little nz! So i have just noticed i do not have anywhere to plumb the oil return...
  8. 01-04.5 LB7 Duramax Powertrain
    I have been having issues with my lb7 stuttering while accelerating over 60% load. I did a balance test and saw the injectors were way out so I replaced them this past weekend. It is still doing the problem. I don’t believe it is cp3 as when hooked up to scanner it will push 20000+ to the rails...
  9. 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...
  10. 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...
  11. Transmission Shop
    I am looking into doing a rebulid on my 01 LB7. There are countless kits I have seen from PPE, to DHD, to Goerend. Im not sure which one to go with. I only want like 750 hp capability so that I can safely run 600 ish. I want to keep to not super expensive but defenitly don't want to cheap out...
  12. General Discussions
    Im having to replace the oil pump on my lb7 and I haven't been able to find much info on replacing it anywhere. I have the everything off of the front end of the truck and the front engine cover off but its looking like i'll have to drop the upper oil pan to be able to get it out. Does the upper...
  13. 01-04.5 LB7 Duramax Powertrain
    Hello all, I’m having an issue with getting my truck running. Background: bought the truck at auction, it didn’t run, figured out it wasn’t getting fuel, replaced the fuel filter housing, got it to run 1 time by pumping the primer, since then I’ve installed a fass lift pump, removed the fuel...
  14. 911 Problems Forum
    I just replaced some Injectors which helped get my blowback fixed on my truck by a shop and then had to do some other front end stuff so it sat in super cold temps . I put a bunch of lifeline and supp In after thought it was a fuel filter so I replaced that and water separator but now it stays...
  15. General Discussions
    Looking to see what thread count was on the lb7 head bolt holes, got my heads off and to machine shop wanted to clean threads up after prepping surface for my arp studs looked it up and couldn’t find definite answer on it.
  16. General Discussions
    Hey guys, I need help trouble shooting my duramax. I was driving today and when I tried to get above 2300ish RPM, it jerked down to maybe 1800 and just bounced around like it’s hitting a low, slow 2 step. It will do it fairly consistently and now the idle surges. Not enough to pick up on the...
  17. General Discussions
    Doing head gaskets on my lb7 kinda waiting on my machine work guy to figure if heads check pressure test if they do im looking at buying threaded injector cups gasket kits and 15 over injectors should i be interested in different injectors? Maybe someone give me idea on some good head gaskets...
  18. General Discussions
    I have a 2003 lb7 with 117,000 miles. I bought the truck a couple months ago and it was my daily driver for about 2 months and did great but leaked some oil. Then one day on the way to work I lost all my oil while on the drive. Truck said low oil pressure and I looked and it was at zero. I shut...
  19. New Member Introductions
    OK, so first off this is my first diesel so bear with me I picked up the truck about 800 miles ago after checking ATF fluid I noticed that it was super dirty. I change the fluid and the spin on filter transmission is shifting great. No jerks or kicks anything like that.I also change the fuel...
  20. 01-04.5 LB7 Duramax Powertrain
    So I was for the longest time getting a crank no start. Went through 3 different brand new filters when it had that it fired like a brand new truck and then 2 filter heads with all new o rings. Changed all the hoses to the FICM, schrader valve and filter housing and added a little lift pump I...
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