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  1. General Discussions
    New to the Forum, but im searching for fuel system related questions and im coming up short. I have a late 2003 LB7 with 215k miles, i just started white smoke and has a single of black smoke on start up. i have not checked balance rates but im fairly certain its injector issues. I have decided...
  2. 04.5-05 LLY Duramax Powertrain
    Hello all, Id like to start off by saying I have done extensive research on my issue and have tried many different "fixes". Background- about 3 years ago truck started knocking real bad, wrist pin bearing exploded. I rebuilt the motor last summer and stupid me didn't replace any of the fuel...
  3. General Discussions
    I have a 2005 lly that goes into limp mode randomly on start up. I start it up and go to back out of the driveway and have no reverse, put it in drive transmission clunks. Keep foot on the break and you can feel it down shift after a few seconds then shift fine from then on. Put it in park and...
  4. 06-07 LBZ & LLY Duramax Powertrain
    Hey new to the forum and semi new to duramax engines. I haven't had my 07 gmc 2500hd very long. I recently sent the injectors to injectors so-cal and had them rebuilt. When I bought the truck it had an edge programmer but I removed it when I was having injector issues thinking it may have caused...
  5. 01-04.5 LB7 Duramax Powertrain
    In the last 1000 miles, I changed my injectors, and fuel filter housing, added an air dog, and threw in a CP3 I bought from a Duramax enthusiast. Since then, the truck has started well when it's 70 and warmer outside. When it gets below 65, it starts to lope and surge a little for 20-45 seconds...
  6. Build Threads
    New to this duramax stuff. Got an 11 Duramax with 91k on it. Only thing done is tuned, intake, exhaust and a fass fuel lift pump. Was thinking of cp3 swap and turbo. Any suggestions ?
  7. 911 Problems Forum
    So to start my lly truck with 230k will crank but won’t start. Now I’ve done all your typical checks like replaced fuel filter housing, rebuilt old one (new one was sketchy) been through 3 new ones, replaced batteries, pulled off the last fuel injector return hose on both banks and didn’t...
  8. 11-16 LML Duramax Powertrain
    2011 tuned with def and dpf permanently repaired. Sinister filter adapter with a CAT fuel filter installed. Had pressure starting to build in coolant system. Diesel shop confirmed it was head gaskets. Did the repair myself, I didn't want to pay $8,000 in labor costs. I installed grade-C head...
  9. 11-16 LML Duramax Powertrain
    Hi all! New member here. I have a 2015 with 415k on it. I’ve had super luck with the truck overall, but alas I figured it had a blown head gasket when I was putting a gallon of coolant in at every fuel stop… I found a diesel performance shop where I live in Ocala, FL. As I suspected they told me...
  10. 11-16 LML Duramax Powertrain
    Ive got a 2011 Denali LML that i bought used in 2019 with 200k miles on it, truck came fully deleted but with no tuner module or any indication of what type of tune is currently on it. Currently its sitting parked up at 270k because it now needs head gaskets. In addition to head gaskets and...
  11. General Discussions
    I've got a stock 2002 GMC Sierra 2500 HD, LB7 with 410,000 miles on it. Done the injectors twice, head gasket and replaced pretty much everything around the engine at some point. I did the CP3 around 250,000 and the way it's been acting lately figured I needed to put a new one in. Rebuilt the...
    cp3
  12. 07.5-10 LMM Duramax Powertrain
    Hey guys. I'm new to this forum but not new to duramax issues unfortunately. So about 2 weeks ago I put new big injectors into my LMM. I have not been able to get it to fire up since. I have an engine starter on the battery and it will sit there and crank with no fire forever. I've replaced...
  13. Aftermarket Mods.
    Hello all the plan is to make over 1,000 horse power on my lml soon i want to make at least 850 by the end of this summer but im trying to put together a mod list i was thinking probably a 12mm cp3 swap and 100 over injectors but i really hate buying parts twice so do i need to go 14mm pump and...
  14. Want to Buy Wanted: Lbz Cp3 Pump

    Parts For Sale
    Hey guys, long time lurker first time poster. Have diagnosed my fuel leak after painting and redoing my whole truck - typical. Im a bit short on funds so seeing if there is potentially someone out here with a cp3 prior to putting a new one on my Credit card. Looking for a good used Cp3 pump...
  15. 06-07 LBZ & LLY Duramax Powertrain
    I just fully deleted and tuned my lbz duramax will the HSP high flow bundle kit, and for some reason the truck now gives a check engine light (P0087) after 3,000 rpms. And I cannot figure out the problem. I just brought the truck in august with 275,000 miles on it. And it does have a airdog...
  16. 07.5-10 LMM Duramax Powertrain
    What have you guys been getting quoted for injector pump replacement? I thought book time was around 6 hours, but I'm getting quoted 18.
  17. General Discussions
    Hey lads, started some research but didnt get much further other than thinking its my cp3 going faulty or possibly injectors?? Every odd time I open the old girl up or lay into her a decent amount it responds by going into a "limp mode" where it wont go over 2,000rpm. I have to shut the truck...
  18. General Discussions
    Does anyone know where I can buy the short metering device extension cable and the temp sensor holding block, see the two items circled in red in the attached photo.
  19. 06-07 LBZ & LLY Duramax Powertrain
    I have a 2006 GMC 2500HD it has 324000 miles on it and the outlet pressure fitting cracked below the nut, i thought it was the fuel line but i was inorrect, i purchased a new fitting from Industrial Injection and the sent me the fitting, but it had straight threads, tth piece that was removed...
  20. 11-16 LML Duramax Powertrain
    I have a 2013 and about 2 weeks ago i had the p0191 code and i replaced the the FPr2 on the LH fuel rail it cleared the p0191 code and then a few days later the check engine light came back on and started throwing the P0087 code i haven't noticed any changes in performance or this all started...
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