lb7

  1. 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...
  2. 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
  3. 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...
  4. 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
  5. 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
  6. 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...
  7. 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...
  8. 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
  9. 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?
  10. 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
  11. 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...
  12. 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...
  13. 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
  14. 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
  15. LB7_01DURAMAX

    Injector problem

    I put some reman 30% over injectors in my truck from Lincoln diesel in 2015, since then I have only put 30k on the truck. Religiously changed fuel filters and ran hot shots secret additive. I got truck out a couple weeks ago and changed oil and has fuel in oil. So I pulled valve covers and ran...
    • LB7_01DURAMAX
    • Thread
    • injectors lb7 lincolndiesel
    • Replies: 12
    • Forum: LB7
  16. B

    2008 lmm tuning questions

    So I sold my 06 lbz got this lmm lift pump,4” deleted exhaust, dsp5, and a v2 autocal Idaho rob all this was done when I bought it thing is no position on the dsp5 feels any different?. Gas mpg sucks only 15mpg truck has a 6” rcd lift on 35s btw any idea if the tunes even are loaded?.
  17. F

    Fuel rail lines bursting

    Did head gaskets studs new injectors new return lines with bolts and washers Truck started fine a few times. I drove it down road about mile ran good pulled back in my driveway that was covered with snow. So I gave some throttle and sent it sideways. Then it shut off. After going through fuel...
    • FletchMD
    • Thread
    • lb7
    • Replies: 17
    • Forum: LB7
  18. kelso06

    4wd problems

    2004 chevy, aftermarket keys (previous owner) torsion bar bolts almost all the way out, new tierods, control arms, ball joints. Drives straight and doesnt jerk in 2wd but in 4wd if you even turn the wheel just a little bit itll jerk the wheel super hard in the direction youre turning. Kinda...
  19. Starfire47

    Limp Mode P0700 P0776

    Looking for input with an issue I have been chasing my tail on. Have a 2003 Chevy Lb7, has a generic canned tune (bully dog?) from the previous owner. 4" Exhaust, New injectors, K&N Intake, 35" tires, 230,000 miles Never had any issues with the truck, have put 70,000 miles on it since I've...
  20. DAVe3283

    S&B 10-1023 LB7 calibration

    As with all my scripts, they are in metric, so set EFILive to metric first! I just installed a S&B 10-1023 "62 gallon" fuel tank. By my measurements, it is 56.2 gallons total, with about 54.7 gallons usable through the included fuel basket. Might be able to sneak a bit more out through the...
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