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  1. General Discussion
    Hey everyone. I noticed my coolant tank having black coolant in it right before my water pump went out. Water pump would leak and I’d fill with Dexcool. Coolant reservoir would turn black again but orange coolant would leak. Anyways I think it’s oil getting into it, but I’m not 100%. Another...
    lly
  2. 911 Problems Forum
    Hey it’s Andrew I have a 2004.5 lly the truck has a Ppe stage 4 tranny has been deleted and tuned with a dsp5 switch for 7 or 8 years never had a problem the transmission through the pu0101 code and my dash Guage’s weren’t working neither were my windows I took the truck to oreillys to have them...
  3. Competition
    How heavy is a street stock pulling sled, and will my 9,500 lb d ring shackle hitch be able to handle it?
  4. Competition
    I have a 2005 LLY GMC that’s completely stock except for an aftermarket exhaust system and a leveling kit, I was thinking to put it in the county truck pulls this year. But I have been hearing a lot of things about the tie rods bending and breaking, so I decided not to. But a friend just told me...
  5. Competition
    I have a 2005 LLY GMC with a leveling kit, otherwise completely stock other than an exhaust system, that I want to put in the truck pulls in the county fair this year. But I’ve heard a lot about the tie rods bending and I do not want that to happen. Can anybody give me any advice on if I should...
  6. Competition
    So I got a 2005 LLY duramax GMC and the county fair is coming up quick. I want to put it in the truck pulls. I’ve heard that they can be a little loose on the front wheel bearings. Is that true?
  7. 04.5-05 LLY Duramax Powertrain
    So I bought a truck the other day, it was an 04 LLY 3500 SRW with a flatbed. I get the truck back to my sisters house and shut it off, I go out maybe 30 mins later and try to start it but nothing. Not even a crank, I could hear the starter clicking though. When I turned the key to run, none of...
    lly
  8. 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...
  9. 911 Problems Forum
    Looking for any tips to diagnose this issue with my 2005 3500 LLY. Little while back I noticed a slight injector knock between 1700-2100rpm. I have since replaced the fuel filter, all 8 glow plugs (3 were toast) and replaced all 8 injector harnesses. The truck started to generate more power and...
  10. 04.5-05 LLY Duramax Powertrain
    Just took a look at a 05 with the lly and am confused on why this hose was cut. Had a bit of smoke/vapor coming out of it. When I did the oil cap check for a blown head gasket it passed but when I plugged that hole it started to bounce a bit.
  11. General Discussion
    I have lly don't make any boost. Replaced map, maf, turbo vane position sensor, check boots and tubes. I have old snap on scanner. Everything seems to be working but no boost. Truck sat for about a year. Turbo spins. I'm stumped need help. Throws po299 code
  12. 06-07 LBZ & LLY Duramax Powertrain
    Just replaced both batteries, and the glow plug module, and brand new fuel pump primer assembly. No codes showing, yet will crank but with no start. Fuel at fuel rail, and primer is working. At rest fuel pressure is showing and holding at around 230. Not sure where to go from here.
  13. Introductions
    Hello, My name is Ed, and I own a 04.5 LLY Duramax with 132k miles. I’ve been doing a bit of research on the LLYs, and I’m considering upgrading the turbo mouthpiece to an LBZ MP soon. Also I am considering getting an S&B Cold Air Intake, but don’t know if I should get an LBZ or LLY Intake...
  14. 04.5-05 LLY Performance Parts Discussion
    This is my first time posting so I’m not sure how all this works. I think I posted in the right place. I have a 2005 ZF6 LLY duramax and my injectors went out. I ordered 30% over injectors but just got told they’re out of stock. I am considering switching to 45%’s instead, just looking for some...
  15. Towing & Hauling
    I use my 2005 LLY 2500HD as a work truck, so I carry a good bit of weight in tools and toolboxes in the back of my truck at all times, and I tow trailers fairly often. I am pretty sure that the leaf springs have never been replaced and are probably pretty worn out. I have airbags for towing on...
  16. General Discussion
    I have a lly duramax that I put in a 64mm stealth turbo. I started it up and making no boost with the veins at 2-4%. While driving it still made no boost. I changed the vane position sensor and in bumped up the veins to 12 but still no boost. Any ideas on what it could be? I checked all of the...
  17. General Discussion
    I have a lly duramax and had to pull the exhaust manifold. The 2 nuts and bolts were rusted and messed up. I can’t seem to find the 2 nuts and bolts. Does anyone know the part number or anywhere I can buy them?
  18. 2001 - 2007 (GMT800) Non Powertrain
    Having some trouble finding a name or part number for this seal between the air intake and the turbo. Any diagrams would also be helpful, as I'm not sure what needs to be done in order to replace it. Thanks in advance 2005 Chevrolet Silverado 3500 6.6L LLY
  19. General Discussion
    Have a 2005 lly did the egr delete a couple months ago when I did I did a coolant flush also and didn’t know to crack the crack the bleeder screw, recently it’s been spitting coolant out of the overflow so first I changed the reservoir cap and did thermostats but also didn’t know to crack the...
  20. 04.5-05 LLY Duramax Powertrain
    Driving down the road my truck will shut off randomly. Lose rail pressure and die with no warning.losses prime as well. Can’t figure it out. Other days there are no issues. Stock fuel filter assembly deleted 42% over CP3 (new) FASS 165(new) EFI LIVE many other parts.
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