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  1. 2001 - 2007 (GMT800) Non Powertrain
    Okay so we had a big rain come through over the last weekend and my passenger floor board was soaked and the plastic foot trim next to the door was full of water as well. I dried the area and I was all good for a little while until I parked up hill for a five minutes then my passenger floor was...
  2. General Discussion
    Alright guys I’m new so I hope this is the right spot to post this. I have 2003 Chevy 2500 HD 4wd with the infamous LB7( 255000 miles, injectors changed about 25,000 miles ago, only mod is a CAT filter adapter)…… (in Alabama) one day about 2 months ago I was just riding down the road and and I...
  3. 911 Problems Forum
    Hey everyone! This is my first duramax and I miss judged my fuel range when pulling a trailer and ran out right in front of my house! I've put about 15-20 gallons into the tank and attempted to bleed the air out of the fuel pump, but when manually priming the fuel filter there doesn't seem to be...
  4. EFI Live
    I have an lbz which I bought from an older guy 2 years ago. When I bought the truck it has an edge insight cts for monitoring. The guy stated he had a stock optimized tune on the truck and other than that no other types of tuning. So I’m wanted to get efi live here sometime soon. I know that I...
  5. Interior
    So I’m having an issue with multiple different electronics. I have a 2006 lbz and I had the tbc 2b fuse blow which stops my dome lights and reverse lights from working. Well when I replace the fuse it’s good for a day or two then pops again. What could be causing this? All my other fuses appear...
  6. 911 Problems Forum
    I just rebuilt my LLY Duramax, it had a cam shaft bearing go out. So I got a new block and installed a new afe cam shaft, Mahle pistons and all new bearings. Now for the problems, after I got everything put in I started the motor, it was reading like 8 pounds of oil pressure while idling cold...
  7. 911 Problems Forum
    I have a 2002 Chevy 2500hd lb7 with 220k miles on it. Injectors we’re done at 180k miles, new cp3 pump was installed at the same time, fuel lines have been replaced, fuel filter housing has been replaced, a Fass pump has been installed, new FPR. Pretty much everything you can think about for the...
  8. General Discussion
    I bought a 2020 Silverado 2500 HD LT. Noticed when I accelerate past 50% when I let off the rpms kind of hang around 2000 for a second before it shifts. Not sure if that is normal??
  9. 911 Problems Forum
    Hello. I headstudded my truck and had put almost everything back togeather, it was a Sunday night and I couldn’t finish and had it towed to a buddy to finish. I get a call the next day from him telling me it idled great but after giving it throttle cylinder 7 was misfiring. He said a rocket...
  10. 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...
  11. 01-04.5 LB7 Duramax Powertrain
    I’m new to the forum and duramaxes. I may be in the market for an lb7 in the future. I know there were injectors issues with the lb7 and I wanted to know how good remaned injectors r. If I buy a truck it’ll be higher mileage (probably close to 200k maybe a little more) and will definitely have...
  12. General Discussion
    Hey guys and girls, Looking at purchasing a 2012 Duramax with 150k miles. It had an EGR delete, and DEF delete. 5" exhaust. Leveling kit. The guy selling is about 6 hours away. Getting it for $26,500. Anything I should be concerned about, things I need to look at? Never bought a diesel, so I...
  13. 06-07 LBZ & LLY Duramax Powertrain
    Ok I'm new here so go easy on me. I have an '06 lbz duramax that has 250k on it. I purchased it 20 miles ago. As I was cruising at 60mph I lost oil pressure and it died and left me on the side of the road. So I towed it home replaced stock oil pump with a pinned wagler with the engine in the...
  14. 911 Problems Forum
    Hi everyone! I've got a 2007 GMC c4500 TopKick box truck that's got batteries draining increasingly faster than before. Liftgate (MBB 3300 lb capacity - it is the back of the box itself) was very slow to open and/or stalled completely and when fully closing back up. Noticed the liftgate light...
  15. 11-16 LML Duramax Powertrain
    so I bought a 2015 LML, truck is deleted but I do not have the actual programmer for it, don't even know what type of programmer was installed to bypass the delete. but I will be driving it and it runs perfectly fine but suddenly losses all power, doesn't throw any codes at all, and when I push...
  16. Aftermarket Mods.
    Hello all! New to the forum. I have a Mini Maxx that will not change vehicles after update, nor will it allow firmware update. It has been VIN unlocked, it isn’t bricked either. I have read that even if you can’t change the vehicle, you can still upload and will identify your vehicle. Problem...
  17. General Discussion
    I have a 2006 lbz duramax and I am considering selling it and going to a 4th gen Cummins. I am torn because the lbz was and is my dream truck, but it’s at 250000 miles now. It will need new injectors and lots of other work done this year which is why I’m considering switching. If I do keep it id...
  18. General Discussion
    Hi everyone, I just upgraded my 1996 gmc sierra 1500 gas to a 2008 gmc sierra 2500hd and I'm having horrible fuel mileage. The 2500hd says it's getting 11.3 mpg. Is this supposed to be normal? I have been seeing people claiming to get 16+ mpg on there trucks. If this is about right could I do...
  19. General Discussion
    I have a 2006 lbz, the speedometer doesn’t work, the glow plug, abs light, and parking break light are on. truck shifts usually around 2500 rpm. all other gauges on the dash work. just not the speedometer. took it to a dealership, they told me it was bad wiring somewhere. they said they fixed...
  20. General Discussion
    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...
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