Chevy and GMC Duramax Diesel Forum banner
  • Hey Everyone! Enter your ride HERE to be a part of this months Ride of the Month Challenge!
  • Truck seat covers are up to 76% off right now on eBay. Click here for Black! Tan! Multi-coloured! even Camo!

Discussions Showcase Albums Media Media Comments Tags Marketplace

1-20 of 173 Results
  1. 01-04.5 LB7 Duramax Powertrain
    Vehicle 2003 GMC Sierra 2500HD 6.6 LB7 Just got done changing out the Fuel Injectors and New CP3, all back together and go to start it and nothing. *Replaced the fuel system in the tank *Replaced one of the hard fuel lines which I accidently snapped *New ACDelco fuel filter *Rebuilt the fuel...
  2. 01-04.5 LB7 Duramax Powertrain
    Need help on knowing if I am going in the right direction with my LB7. I know I need injectors and head gaskets in the truck. The truck has a cold air intake, 4" straight pipe, lift pump, and 5 position tuner. (I do not know the tunes in it) So, I am getting the complete head gasket kit...
  3. 01-04.5 LB7 Duramax Powertrain
    I need help trying to diagnose an issue I have with my 04' LB7. I've noticed two issues with it. Right away when accelerating it feels like it has zero power and then when still trying to accelerate it takes off like a bat out of hell until backing off the accelerator and then issue is gone...
  4. Turbo's Stock and Aftermarket.
    Hey I’ve read a lot on here but first time posting. I recently installed a BD Sreamer turbo on my LB7. Seems to work good but I have built trans tuning (stock injectors stock cp3) and can’t get over 30 pounds of boost out of it. Seems a bit low wondering what some other guys think. I’ve checked...
  5. 01-04.5 LB7 Duramax Powertrain
    Hey y’all, looking for help and ideas on a new problem that just started: On the night of Independence Day I was parked in a ditch for a party, and as I was leaving I threw it in 4WD High to pull out, and backed out of the ditch and onto the driveway at a tight angle with the wheel cut all the...
  6. 911 Problems Forum
    I’m having a weird whine happening that matches rpm, does it when revved in park as well as driving, just replaced steering pump and water pump so I wonder if it’s the turbo leaking or going out?
  7. General Discussion
    So I have an 03 lb7 duramax with roughly 340,000 miles on it. It’s got a bunch of work done to it... transmission, glow plugs and (Bosch OEM injectors) were replaced about 40,000 miles ago. I bought the truck back in March so these repairs happened before I purchased. Truck ran pretty fine...
  8. Aftermarket Mods.
    hey I've had this pickup (2002 lb7) for I want to say about 2 years now. I want to upgrade my tuner I have a edge attitude it's a grey one I don't really know if I'm right on what I have so that's why I include the color. I want to get the edge evolution cts3 would this be a worth while upgrade...
  9. 01-04.5 LB7 Duramax Powertrain
    Ok here goes!! 04 lb7 Replaced injectors, cp3, fuel rails, junction block pretty much entire fuel system. Has lift pump. Had #8 and #6 injector fail on me. Replaced these injectors primed the fuel system and she fired right up ran it for a few minutes to verify all telemetry was good and shut...
  10. 911 Problems Forum
    I have a 2003 lb7 with 192k on it, for the past 3 months it has had an issue of starting immediately dying then taking about 3-4 seconds to crank, it only happens every once in a while. Truck has had -injectors -fuel lines -tank flush -filter housing -fprv All in the last year or so, I believe...
  11. 01-04.5 LB7 Duramax Powertrain
    So I’ve been having this problem for month now since I replaced injectors which I don’t they are the culprit but I think something happened when I did them. So I start the truck and everything is fine, runs great no issues but once I get going and up to temp every time I return to idle it will...
  12. 911 Problems Forum
    I have a 2001 gmc 2500hd lb7 I was driving home today hauling a dump trailer not full or anything. Then about 10 min from my house it started just rolling coal blacked out everything behind me I got it home popped the hood and the turbo housing was smoking. I keep the truck in economy tune for...
  13. Aftermarket Mods.
    So I have a LB7 from California with the EGR stuff on there and basically i was just wondering if the stealth 67G2 Turbo would fit. yes i know it says its a drop in factory appearing turbo but i havent deleted my egr yet and to do that the right way i want to get different up pipes and a...
  14. 01-04.5 LB7 Duramax Powertrain
    Hey all, I am experiencing a distinctive whine/hum - almost sounds like an electrical type of whine, when my TC is locked. I have done lots of research and cant seem to find any definitive answers on what it could be. The truck has: -Fresh transyd fluid with new internal filter and new allison...
  15. Gauges, Electronics and Wiring.
    2001 GMC Sierra 2500HD CCLB, stock tire size, EFI Live, 160K miles. I'm wanting to recal my speedo and wondering if there is a cheap tuner/programmer or something out there that will do so (under $300?). I'm not looking for a tune or anything as I already have EFI Live. The speedo works fine and...
  16. 911 Problems Forum
    I have a 2002 lb7 duramax. I went out to start it and it will not start. It just cranks and cranks. Originally threw a p1550 code. “Low Voltage to Fuel Injection Control Module” it will not clear. I’ve replaced crankshaft position sensor. Fuel filter and batteries. I pulled connectors to the...
  17. 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...
  18. EFI Live
    I know efi live is the best but which efi live tuner is the best looking for overall upgrade and little bit of smoke i have a 165 lift pump and all stock except air intake and exhaust
  19. 01-04.5 LB7 Duramax Powertrain
    2004 Chevy LB7 25HD - 148k PPEI 5 switch tune and 4" air intake and 4" exhaust. A couple months ago my truck started leaking oil when the back end was parked on a slight incline, thought the oil was thin and coming out of breather so we changed that out. still leaked. then we replaced the...
  20. General Discussion
    This is a dumb question, but which turbo will whistle the loudest out of the exhaust on an lb7, and rds 64mm drop in or the fleece 63mm drop in Thanks -Trevor
1-20 of 173 Results
Top