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  1. 04.5-05 LLY Duramax Powertrain
    2005 completely stock lly Just got done replacing the fuel pressure regulator and had a little mishap in the process. I started leaking coolant from line 34 and I am needing o-ring number 33 in this diagram. Was hoping someone could point me in the right direction of possibly a part number or a...
  2. 04.5-05 LLY Duramax Powertrain
    So I'll preface this post by saying I have searched loads of forum posts related to engine noises and the similar variations and have decided that I'm going to make a post. I have read the "read this first before posting" post. While in park or driving with no load there is a noise from...
  3. 04.5-05 LLY Duramax Powertrain
    2005 Duramax will not shift out of first gear, when pulling it down into gear it slams in, parking brake light is on( ebrake is not on) and abs light is on as well. TCM and transmission are both new. Truck did the same thing prior to replacing TCM and tranny. Any ideas what could cause this...
  4. Transmission Shop
    Hi, new to the forum. 2006 Silverado duramax lly 4x4. Odometer almost 300k. Awhile back when I first started driving, I shifted from park to drive/reverse and it popped into neutral and i got the dash warning range shift inhibited. I let the truck sit for a bit and then drove it home with no...
  5. General Discussion
    Hi guys I have a 2005 sierra 2500 with the LLY. It's a project truck I have done lots of work to, I have done a couple other llys in the past but this one has given me alot of trouble, as 2 heavy duty mechanics have misdiagnosed it... work done; headgaskets, studs, glow plugs, heads milled and...
  6. 04.5-05 LLY Duramax Powertrain
    New heads all new gaskets New valves, new springs, new keepers, new water pump, new Thermostats, mouthpiece’s have been changed upgraded inner cooler upgraded radiator, all new hoses. literally the works have been done. Why is it still overheating
  7. General Discussion
    I have a LLY with a 64mm turbo, airdog 165, 3” downpipe to 5” exhaust. Every time I start the truck and let it warm up then take off for the first half mile or so it will blow white smoke then goes away the rest of the drive. I let the truck warm up to 100-130 at 50°F outside. Anyone know why...
  8. 911 Problems Forum
    I just got back from vacation and had my brakes serviced while I was gone. I also had an issue with the OBD reader not working, so they found the issue (simple fuse) and fixed that. The fuel gauge issue has been a problem as well, and I read that resetting the codes it throws (P0700 and P0090)...
  9. General Discussion
    I had an issue with my 04 lly, poped the hood and there was a good amount of oil around the turbo area. Still creating the same amount of boost and still the same loud whistle it has always when I bough the tuck last August’s. The turbo is just about 2 years old. Some other issues were a...
  10. Gauges, Electronics and Wiring.
    Gonna start this out with I’ve searched and searched and nobody seems to have had a similar problem. I’ve got an 04.5 LLY duramax with a fuel leak on the drivers side of the motor under the brake reservoir by the injectors. The fuel leak is on the hard line coming from the back to the top of...
  11. 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.
  12. Introductions
    Hello, I just moved to Las Vegas and I’m looking for a reliable shop for my 04.5 LLY to get some work done on it, along with a qualified ALASON Trans shop. Does anyone have any suggestions? I’m not trying to go overboard tweaking it, I simply want to improve what’s there and optimize...
  13. 911 Problems Forum
    I have a 2004.5 lly duramax last night it got to -15 degrees and it started fine and ran fine for a while on the way home however it started dropping fuel pressure. I kept going for a bit then the truck just stalled and would barely start. I had it towed home and tried it this moring it started...
  14. 04.5-05 LLY Performance Parts Discussion
    Dose anyone have a lly ficm can’t find one anywhere
  15. 04.5-05 LLY Performance Parts Discussion
    Hi everyone, I have a stock 05 LLY Sierra 2500HD. I was changing out the thermostats when I noticed an oily soot build up down from where the EGR intake manifold connects to the engine. Is there a gasket that should be replaced there and is it as simple as unbolting the manifold at that spot and...
  16. 04.5-05 LLY Duramax Powertrain
    Hello, I have a 2005 lly duramax. I recently did head gaskets and studs on it. In the process I put new injectors hard fuel lines , return lines, intake,up pipe, y bridge. Air dog 150 and cp3 pump now currently I am having a problem where when I accelerate hard in lower gears it pops and there...
  17. General Discussion
    Hey lads, started some research but didnt get much further other than thinking its my cp3 going faulty or possibly injectors?? Every odd time I open the old girl up or lay into her a decent amount it responds by going into a "limp mode" where it wont go over 2,000rpm. I have to shut the truck...
  18. 04.5-05 LLY Duramax Powertrain
    hello, just joined the forum, looking for help. im new to diesels but know a little bit ive got an 04.5 lly thats having issues starting, doesnt matter the temperature. the truck will crank and crank, but absolutely will not start unless a quick shot of starting fluid is introduced into the...
  19. DF Video & Picture Section
    Hey all, I've been reading a lot on these forums since I picked up my LLY and thought I would share some of the progress that I've been making on it for any that want to watch. So far I've done the following: New Headlights, New Tail lights, Turn signals, Shocks, Airdog Lift Pump, New Mirrors...
  20. General Discussion
    Hey everyone, 05 LLY 479xxx.. just bought the truck tuned with a banks six gun tuner. I was running tune 5 on the tuner and was driving down the road without issue, all of a sudden “service brake system, service 4wd and service abs” lights all came on and the truck turned off like someone...
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