lb7

  1. americanrebel15

    Speedometer Reading Issue

    How goes it? I have my 2003 LB7 that has an issue with the speedometer either reading normal speeds or reading triple the speed intermittently. I've replaced the speed sensor on the transfer case and had my instrument cluster rebuilt by ISS Automotive. Neither one of them has fixed the issue and...
  2. 7

    2002 LB7 pinouts

    Does anybody have the correct pinouts for FICM, ECM, and fuse block for a 2002 lb7? I can only find the ones for 2003 and up. Chasing a crank no start and have narrowed it down to something electrical. pin 30 on my ignition relay is not hot key on or off and pin 86 87 on the same relay are...
    • 702Lb7
    • Thread
    • ecm electrical ficm lb7
    • Replies: 7
    • Forum: LB7
  3. LB7StillAlive

    03 LB7 Build

    Figured I’d try and chip in as I’ve used this forum over the past couple years. I have an 03 CCLB which has had failing injectors for 2+ yrs. I kept waffling back and forth on whether I was going to retire the LB7 and go new to me (this means 3-5yrs old truck) or keep her running and commit...
  4. O

    Looking to build a 600HP when Towing LB7

    I am looking to build up my current setup to be able to tow with it turned up. This is the current setup; LMM/LBZ rods LB7 Crank (keyed) Delipped Mahle Pistons O-Ringed Head Injector Cup Hold downs EMC Head studs Stock CP3 (100,000km old) Ryans Diesel Supercore 64mm 3.5" Intake Horn 3" Downpipe...
  5. T

    2002 lb7

    2002 lb7 currently Allison 1000 5speed about to swap to a zf6 wondering if anyone can help me with either tuning or flashing my truck to act like a factory manual curious what I need in my end to upload the file as well as what is needed to make this tune
  6. J

    Brake booster issue

    I recently noticed a puddle of oil under the driver's side fire wall area and found the brake booster wet with oil. Figuring it had given up, I ordered a replacement, but found the source of the leak to be the line between the brake booster and power steering unit. I replaced both the line and...
  7. Jordan715

    lb7 "stutter" under acceleration.

    Ive got a 2002 lb7, its got compounds,sump,lift pump,efi live,factory injectors. Just started having issues while cruising, if im just barely in it the truck kinda stutters/bucks. Seems to be around 50-70 mph when your trying to maintain speed. If you get into it harder truck is fine, its making...
  8. Jordan715

    LB7 fuel rail plug leak.

    I took my dual fueler off my truck and was left with an open fuel rail, so I got a fuel rail plug and I cant get it to seal. The plug didn't come with an o-ring so i threw one on and it was better for 30 seconds and blew out. And tightening the plug resulted in destroying o-ring. Any...
    • Jordan715
    • Thread
    • lb7 lb7 rail racevalve
    • Replies: 2
    • Forum: LB7
  9. CrankyDiesel

    LB7 to LBZ true Swap

    This might be a little long so bare with me. I just bought a 06 LBZ CCSB, non running from the information I've gathered its a 06 body on a 02 frame. "Previous owner" had a LB7 in it. he swapped the 06 Dash out with a 01-02 to make the old LB7 motor work. So with all the Engine, Transmission...
  10. Jordan715

    lb7 dual fueler tensioner issue.

    So i bought a 02 with compunds and ppe dual fueler. Ive had 3 belts on it now and after a few idler issues addressed, now its just my tensioner. Problem is i ordered the new one from rock auto and it fits and looks almost same as my last but wont quite pull enough to get the belt on. Is there a...
    • Jordan715
    • Thread
    • belt tensioner dualfueler lb7 ppe
    • Replies: 14
    • Forum: LB7
  11. G

    LB7 Blowing Smoke under heavy acceleration

    I bought a green extended cab lb7 with 125k miles on it a few months ago and have been noticing this problem slowly getting worse. It seems to be that whenever I really get into the throttle I seem to get some type of lighter colored smoke, I believe it white with a possible tint to it. But it...
    • greeenlb7
    • Thread
    • #help blue smoke lb7 white smoke
    • Replies: 12
    • Forum: LB7
  12. J

    Actual rail pressure not keeping up to desired. 02 LB7

    Hello everyone. I am hoping that someone can help to point me in the right direction on this issue I am having with my 02 LB7 with 350k on the clock. I am having trouble with the actual rail pressure not keeping up to desired under heavy pedal application, particularly when stabbing the...
  13. ClappedDmax

    Help please, dropped driveshaft

    Hello, I’m new to owning a DuramaxI, my truck is a 2004 GMC Sierra 2500hd lb7 with 390k. I need help/advice on what to do. I recently had a buddy install ujoints (duralast brand) because the gear clunk & vibration when driving. After install I drove 40mi. to St. Louis & on my way home, Im...
  14. Braden ball

    2004 lb7 duramax

    Hey I’ve got a 2004 lb7 Duramax diesel it’s all stock other then a upgraded intake right as now I’m running a stage 2 tune on it that’s 90hp I think stage 3 is 150hp I was wondering if a stage 3 tune would hurt the truck any since it has stock injectors and a stock Allison transmission. Thanks
  15. L

    SoCal Lb7 Duramax

    In need of some guidance about vaccum pump delete, if I take it off do I plug it? if so with what? Also anyone near Socal have an EFI live laying around I could buy or even pay just to use?
  16. robstu85

    Bought LB7 04/13. Won't start 04/16.

    Bought my first diesel 04/13 and thought I got a true gem; a 1 owner 2003 2500 LB7 with 76k miles from an 85 year old man. 3 days later I can't get it to start. Some background. When I went to show my dad the truck before I bought it, it started for 3 seconds then died. Owner said could be...
    • robstu85
    • Thread
    • lb7 lb7 crank no start lb7 diagnostic lb7 duramax
    • Replies: 23
    • Forum: LB7
  17. P

    Need help please.

    I have a 2005 Gmc topkick 4500, with a Duromax engine. The vin code called for a LLY engine, bought a used engine, placed in truck, will not run right, like its in Limp mode. The truck is a Bucket Truck, I am being told the truck was not a complete vehicle from factory but a cab chassis. So the...
  18. M

    LB7 Rebuild

    Greetings everyone. I'm new to forums and a onetime Duramax owner. Please be gentle, keep it simple and civil. I've got a 2004 GMC Sierra 2500, regular cab. I purchased it form the original owner, a good friend. Combined, we put 325,000 miles on the truck. The truck has had two sets of...
  19. G

    Borrowed FIL's truck, now it is leaking. 6.6L LB7

    All, Hoping this group can help me out. I've been using my father-in-laws truck (2003 3500 Duramax 6.6L) for the past few months for a house project and it has recently (last 2 week) developed a leak. I've tried to track down the issue but I'm not really sure what I'm looking at and having...
    • grundyo
    • Thread
    • lb7 lb7 diagnostic lb7 duramax
    • Replies: 14
    • Forum: LB7
  20. LSxBakakos

    Lb7 limits

    Hey guys, been doing weeks of searching and finally decided to register, hopefully I'm positing in the right spot From what I've gathered I've seen guys leaning on SBE and them living from 650-750 at that level, but most the posts have been from years ago and technology has come a LONG way...
    • LSxBakakos
    • Thread
    • lb7 stock bottom end
    • Replies: 48
    • Forum: LB7
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