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  1. 911 Problems Forum
    Hi, i need help from some of the experts on here. i have checked my wiring and all seems fine. when i unplug the connectors to the FICM and crank engine i get NO BLOW of the ECU 25 amp when i plug in FICM the 25 amp fuse BLOWS, so its probably bad ficm but they are way expensive and hard to find...
  2. Introductions
    Hello all, just wanted to introduce myself in the proper way before I dive into asking you all a million questions. I’ve been around a few LLYs for the past 7 years or so. My father has a unicorn single cab long bed lly with a stick 6 spd. I currently drive an 05 single cab long bed lly bone...
  3. Vehicles For Sale
    2005 GMC Sierra 2500hd diesel Duramax Engine with a 6 speed Manual transmission Asking 17.5k Location: Northern California One owner vehicle ( recently bought from original owner but I need an automatic, I am second owner) clean carfax Zero blowby no leaks 4x4 Clean Title Manual Transmission...
  4. Looking For/ Wanting To Buy
    Just looking for after market exhaust manifolds, and down pipe for my 2005 GMC Sierra 2500HD. Thanks Leonard [email protected]
  5. 04.5-05 LLY Duramax Powertrain
    So I have a 2005 LLY Duramax crew cab and I’m new to the Duramax diesel world and I’ve only owned the truck since October 2019 til now and the truck just turned over 205k miles. Now my question is, would a leaking injector return line cause injector knock? The passenger side, #7 injector, return...
  6. 04.5-05 LLY Duramax Powertrain
    replacing my headgaskets and putting studs not sure If i should worry bout injectors or cp3 while I'm there was wondering if known to have issues an how the cp3 last I am getting the mbrp downpipe to put on 2 just dont know what else i have to do i know it needs the hoses on the fuel lines any...
  7. General Discussion
    Been fighting an overboost code and power issues with black smoke for a while now. Decided to borrow my buddy's Edge CTS2 to use as a monitor without the tunes. Once up and running I was able to see that my truck was idling at 7psi of boost and my turbo vanes were stuck at 9%. I also checked for...
  8. EFI Live
    Ive done a fair amount of research but am not satisfied with results. I have an 06 lly (engine, ecm, etc is lbz). Label says stock HP is 310. If I go with a tune from GDP for efi live, will I get in setting 1 (+20hp) 330hp or 380hp? Don’t want to over run my truck, and the tuner said it would...
  9. Transmission Shop
    Hello, first off I have searched this and went through 10 of the 25 pages, provided in my search. With that my question was not answered. I have a 2004.5 lly with the 5 speed Allison 1000, I’ve been doing all of the supporting mods and I’m almost ready to tune. I’d like to jump into my trans...
  10. Looking For/ Wanting To Buy
    As the title says I need a functioning LLY turbo charger.
  11. 04.5-05 LLY Duramax Powertrain
    Hola, and thanks in advanced. So I'm having trouble finding the exact information and parts that I need. I have a 2005 Duramax 3500 lly So basically I'm wanting to do a full egr delete, recently found out my egr is leaking radiator coolant she has 270k miles, and I said to hell with the egr...
  12. 04.5-05 LLY Duramax Powertrain
    I have an lly duramax with 170k miles on it, everything is stock besides a cold air and efi live, I am having low end boost problems and it seems like my wastegate is stuck open. I've ran a boost leak tester and there is no boost leak, so I've narrowed it down to the solenoid actuator, and I was...
  13. General Discussion
    Hello everyone, i was driving home this morning from work, and i was going up a decently steep hill. i was accelerating pretty hard before i heard a noise and then my truck kinda jerked a little, then my rpms dropped, then started increasing but my transmission wasn’t shifting right away, then i...
  14. 04.5-05 LLY Duramax Powertrain
    Hey guys I’m new on this thread as I’ve read a lot of these over a long period of time I’m finally posting to hopefully hear some good insight into what could possibly be the issue here. Here’s number one. 1. So I bought this truck as my first diesel not knowing anything about them... my...
  15. 2001 - 2007 (GMT800) Non Powertrain
    So I've got an 05 lly, recently it has been giving me some issues. The other day I was driving down the road and the rpms dropped and it lost power as if only half the fuel was getting to the engine. I put a new fuel filter on it thinking that could be the issue and it wasn't. When it does this...
  16. 04.5-05 LLY Duramax Powertrain
    I have a 2004.5 lly duramax that hasn’t had an egr delete and I didn’t know if I would have to have it retuned when I do the delete.
  17. 06-07 LBZ & LLY Duramax Powertrain
    Hey guys new too this forum any and all help I can get is very much appreciated. I have a 2005 crewcab 3500 duramax that had a blown up lly. I also had a 2007 gmc sierra 3500 with a complete running lbz drive train but was a wrecked ext cab. I swapped motor trans harness ecu etc the motor is...
  18. EFI Live
    I just recently had some work done to my LLY. It has regular ol EFI live with a DSP5 from Kory Willis. I’m looking to change up my tunes. Unfortunately the tunes were uploaded via laptop and my tuner doesn’t have my stock tune on file. I’m looking to upgrade to an autocal, that way I always have...
  19. 04.5-05 LLY Duramax Powertrain
    Hey yall I've got a kind of odd-ball question. See ive been having some T-case issues, its grinding constantly when truck is moving, sounds absolutely terrible, like im dragging a paint bucket full of nails and rocks and shit.. anyways, I took it in to my family's dealership where Johnny, my...
  20. 06-07 LBZ & LLY Duramax Powertrain
    Hey guys, first time posting on here. I’m currently looking into getting my first duramax and did some research and am set on an LLY or LBZ as they do not have DEF emissions. Here in SE Texas these trucks are about 16k for one with 150k miles on it bone stock. One with 200k-240k miles is about...
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