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  1. 04.5-05 LLY Duramax Powertrain
    I am in the process of finishing up a rebuild on my truck after sitting disassembled for about 4 years. It cranks fine but never hits a lick. The primer will get hard like it's primed until you crank it and it's soft again. I've replaced the filter head, bypassed the fuel lines by running a...
  2. 01-04.5 LB7 Duramax Powertrain
    I have a 2001 gmc 2500 lb7. Went to start it today and had crank but no start. Pushed primer pump and It was firm. Read the codes and had P6135 P6139 and P1125. Tried clearing codes and unhooking battery and they came right back. I noticed that the glow plug light does not come on anymore and it...
  3. 911 Problems Forum
    Been a member here for a long time cant get logged in to my old profile. I have searched but not found a similar issue. 2006 crew cab lbz with 240k miles. Stock tuning, egr deleted, 5" straight pipe, aftermarket rad and trans coolers, lower temp tstats and now an Airdog 165. Had the truck...
  4. 911 Problems Forum
    i need help getting my truck started. So i have a 2005 duramax crew cab 4x4 all electric i bought as a roller , i bought a donor truck that was rolled over that was a 2006 duramax single cab service truck 2wd all manual, before pulling anything off the truck was running and driving still. I put...
  5. 911 Problems Forum
    Hey everyone, I’m working on my 2002 LB7 and I can’t get it to start. Original problem was the fuel in water sensor cracking and leaking causing a loss of prime. Replaced that and reprimed it and the truck does not want to start. I’ve tried hitting it with some starting fluid ( sprayed a rag and...
  6. 911 Problems Forum
    Ok, scratching my head here and I need the truck for this weekend. I just finished up ripping the stock turbo out for an s400, and after putting the truck back together, truck will only crank but no start. Starter is only a month old and cranking healthy, batteries are good and have it on a...
  7. 911 Problems Forum
    🙏 Any help on this one is greatly appreciated! TIA. My Goal:I mainly want to diagnose it, I paid $2500 and I want to make as much of a profit on the truck as possible even if that means fixing it(within reason) although I’m tempted to see what I can get for it as is… Truck and history: Ok so I...
  8. General Discussions
    Hi everyone, I have a 2005 LLY duramax, got it needing injectors. Replaced the injectors and fuel rail sensor. Truck ran great for about 10min then started to run like shit when it started throwing codes. The truck has a code P0642, low voltage circuit A. When you unplug the fuel rail sensor and...
  9. 01-04.5 LB7 Duramax Powertrain
    Hey. I have a Duramax 6.6 lb7 2002. That cranks for almost 30seconds before starting. After it has started it runs fine. I have changed starter, Dieselfilter and housing. But still not any better:( Btw. Sorry for my English skills i am Norwegian.
  10. 911 Problems Forum
    just recently bought this beautiful gmc 3500 for 1200 and a case of beer but the only thing thats wrong is its a crank no start its got a crank position sensor code and a cylinder 3 glow code its only cranked over once only for the reason on ether and pumping the gas pedal it sounds like its got...
  11. 911 Problems Forum
    just recently bought this beautiful gmc 3500 for 1200 and a case of beer but the only thing thats wrong is its a crank no start its got a crank position sensor code and a cylinder 3 glow code its only cranked over once only for the reason on ether and pumping the gas pedal it sounds like its got...
  12. 911 Problems Forum
    Hi everyone, I recently acquired an '02 Chevy 2500HD w/ Air Dog II Lift pump, and I'm having a hard time reliably getting it started. Once it gets going, it runs fine, no smoke, no rough idling. Here's what I'm seeing: Fuel & Air filter recently changed in stock housing, AirDog filters still...
  13. 911 Problems Forum
    Truck had light hard starting after fuel filter change (might not have anything to do with problem), thought not primed well. Pumped up the fuel pressure. Truck sat for 4 days. Try to start, turns over 1 revolution then stops, then again, and again. No light indications for roughly 5 cycles...
  14. 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...
  15. 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...
  16. 911 Problems Forum
    I have a 2003 lb7 ran great when I first got it 161000 miles except sometimes the starter grinds no teeth are missing on the flywheel and I put a new starter on still does it. Then it at times would start right up and sometimes it wouldn't if I let it set for an hour or sometimes all night it...
  17. 01-04.5 LB7 Duramax Powertrain
    I've got an 04' silverado with a vin 1 lb7 and once every couple months it will crank but not fire no matter how long you crank. I replaced the primer pump, fuel lines and fuel filter. It changed nothing. I can prime it up tight with no air and as soon as I crank it I lose the prime. I can prime...
  18. 01-04.5 LB7 Duramax Powertrain
    Hello everyone. I know this has been discussed many times, but I can't find my specific issue. Truck is a 03 LB7 with 260k on it. I do the fuel filter religiously every oil change because of these pesky injectors. I have also had to replace the passenger side bank of injectors in the last 10k...
  19. 07.5-10 LMM Duramax Powertrain
    I have a 08 lmm will crank but not start. Started up first thing in the morning noticed it was a little “noisey” like a rattle. Checked oil ect everything was up to par. Drove appx 10 miles and started noticing a vibration when on the accelerator. Pulled into a gas station and it had a huge lope...
  20. 04.5-05 LLY Duramax Powertrain
    I’ll start this off by saying I haven’t heard this truck run yet. LLY. Doesn’t prime. I believe there’s air drawing into the fuel system. Previous owner replaced fuel tank, sending unit, fuel lines up until where they turn up at the fire wall under the cab, filter housing and has a cat filter...
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