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  1. Duramax First Generation: 2001-2004 (LB7)
    Ok so I have a 03 6.6 about 6 months ago got the notorious white smoke then I started getting performance issues around the same time truck will spit sputter don’t wanna build rail pressure so I replaced with a good set of running injectors until spring since I do plow with it last minute and I...
    lb7
  2. Duramax First Generation: 2001-2004 (LB7)
    Big Starter nut has 12v, each battery has 12v, started before I swapped the transmission, all lights turn on turn key to start just slight clicks all lights go out besides cel, and you run codes no codes present. Where do I start?
  3. Duramax First Generation: 2001-2004 (LB7)
    Ok I have a 2003 lb7 will not start even with starting fluid I've noticed a bad solenoid on my starter would that pose a problem with the glow plugs
    lb7
  4. Duramax First Generation: 2001-2004 (LB7)
    Hey all, I own a 2003 2500HD lb7 with 230k on the dash, she had a catastrophic failure and is now needing new rear gears, new driveshaft, new transfer case, and a new transmission. This truck is lifted 6” on 38” tires and 20’s. I’m seeking advice in many regards; I’m interested in BD Diesel...
  5. Duramax First Generation: 2001-2004 (LB7)
    I have 2001 lb7 with blown engine. My choices of swap are as follows 1. 2008 LMM complete donor truck 150k with efi live and delete 2. 2003 LB7 complete with harness and new injectors. 60 day warranty. Both will need some type of rewiring to make work . What should I do ?
  6. Introductions & New Trucks
    Hi, my name is Ryan I have an 03 GMC sierra I have the truck wrapped with my company logo. Its just me working for myself so I figured it would be good advertisement, but point being is I don't have some big company budget to fix my work vehicle. I'm looking for a bare bones motor I haven't had...
  7. Introductions & New Trucks
    Hi everyone, just came across this forum and checked it out. Looks like another good community of diesel enthusiasts. I currently own a 2002 Silverado 2500HD 4 door short box with a LB7. She has 245000 and the body is in pretty good shape for being a Wisconsin truck. I plow snow and it is much...
  8. Duramax First Generation: 2001-2004 (LB7)
    So I just rebuilt my fuel filter housing with new “O” rings and bleeder screw. Had to unplug a couple sensors and what not to make it easier to pull the filter and housing out.. rebuilt the housing out it back in the truck and put everything back together plugged everything in and bled/primed...
  9. Duramax First Generation: 2001-2004 (LB7)
    i got a 2003 LB7 that needed injectors it was filling up my oil with diesel. So got injectors changed and return lines changed. Put everything back together and truck only cranks for like maybe 4 seconds and it stop cranking even with me having key in crank position. Got a scan on it to read...
  10. Duramax First Generation: 2001-2004 (LB7)
    I have a 03 dmax federal lb7 I replaced the HG and 1 new injector because I broke the terminal. In the beginning 2 injectors were reading balance rates of +15 while the rest were reading -7 I continued to drive it because I was running injector cleaner threw it and at the time the rates clears...
  11. Duramax First Generation: 2001-2004 (LB7)
    03 lb7 196k miles. I’ve owned since 187k. Previous owner said to have done injectors around 100k. Haven't noticed any oil spots on the ground when parked. Looks to be an older leak but not sure. Any help appreciated. Photo is Passenger side.
  12. Duramax First Generation: 2001-2004 (LB7)
    I have a 2003 LB7 duramax completely stock. I bought it how it sits thinking I had the solution to fix the problem and my solution did not work out. So I traded this guy my car for the duramax I went over to look at the truck knowing it wasn’t running. We threw a battery charger on it and it...
  13. Duramax First Generation: 2001-2004 (LB7)
    I have a 2004 LB7 GMC that is getting what I average to be about 4mpg (120miles on a full tank) I bought this truck with a lift already on it, so I don't know exactly how high it is, but it is barely clearing 37s and has an aftermarket front bumper. I know these all hurt milage, but I never...
  14. Duramax First Generation: 2001-2004 (LB7)
    Going to explain in detail to what I did the best I can. I'm no mechanic but can take things apart and put it back together so that's a plus right? Have a 2001 Chevy 2500HD with a LB7 6.6 Motor. The motor that was in the truck had a bad head gasket and an extreme amount of blow by. So I bought...
  15. Allison OEM
    Truck will not go into any gear, just thumps really hard and rolls a few inches either direction. Mechanic shows code of P0562, TCM low voltage. I've exhausted all my internet research down to batteries, ignition switch, wiring short between TCM and trans, or TCM failure. I replaced ignition...
  16. Duramax First Generation: 2001-2004 (LB7)
    I just had my 3rd starter in 4 weeks break, wtf? After replacing it the second time I check the bolts for tightness daily and they are tight. I've never seen a starter break off and the part of the housing that is bolted is still attached to motor. Until now that is. And idea why these keep...
  17. Duramax First Generation: 2001-2004 (LB7)
    I am not a mechanic and I am probably way over my head! My son purchased a 2003 LB7 truck with 95,000 original miles. It runs rough at idle and has excessive blow by. The mechanic is recommending a used engine swap with a 176,000 mile LKQ motor instead of fixing this one. His reasoning is...
  18. Duramax First Generation: 2001-2004 (LB7)
    I’m a proud owner of an ‘04 ccsb lb7 with a zf6. My problem is the poor thing needs either a rebuild or new owner. I put 127 miles on it last year, mostly plowing snow. It’s a fairly solid truck with minimal rust and decent interior. It for certain needs head gaskets and injectors. And while I’m...
  19. Duramax First Generation: 2001-2004 (LB7)
    I have read a bunch of no-start posts and am struggling a bit truck ran and started fine then sat for 4 days and would not start fuel 1/2 tank Pressurized tank could not see leak Cranks without problem I primed got air out of bleeder screw, then primed till hard, went to start and lost prime...
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