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  1. 11-16 LML Duramax Powertrain
    Hi guys. My lml has been making this sound for about a year now. It doesn’t do it everytime I drive it, but when it does it’s after the truck is warmed up. Runs and drives perfectly. No one can seem to figure it out was just wondering if anyone has heard this before. Coming from right behind the...
  2. 911 Problems Forum
    2009 gmc 3500 6.6 turbo. got on the highway the other day and seemed to lack usual get up and go at the top end.. heard light ticking- turned off the radio and barely heard it above road noise- checked all gauges within normal and no check engine light..proceeded carefully By the time I arrived...
  3. 911 Problems Forum
    Hello. I headstudded my truck and had put almost everything back togeather, it was a Sunday night and I couldn’t finish and had it towed to a buddy to finish. I get a call the next day from him telling me it idled great but after giving it throttle cylinder 7 was misfiring. He said a rocket...
  4. 11-16 LML Duramax Powertrain
    Hello, I headstudded my duramax without pulling heads using a xotic kit. Everything went well coming apart and going back together. However it was on a Sunday night and I don’t have time to finish so had a buddys shop finish putting intake stuff and harness back together. Told me he started...
  5. General Discussion
    I just bought a 13 lml. 155,000 miles. Test drove it all sounded great. After about 300 miles I started hearing a knock, hooked computer up and cylinder 6 balance rate was at -4.2. Changed injector same problem. The noise only comes when the truck it warm or up to temp. I can unplug injector...
  6. 911 Problems Forum
    I have a 2008 gmc 2500 just had a ppe stage 5 trans and convert put in a year ago. About 2 weeks ago I had a minor tick that would get louder with rpm and I was driving home from work and its now really bad. I have taken the transmission out to check the flex plate and still all in 1 piece...
  7. 06-07 LBZ & LLY Duramax Powertrain
    Got a knock and black smoke on acceleration balance rates are between -3 and 3 pretty sure its all stock i know i havent done anything to it what should i b checking i checked all boots for a boost leak
  8. General Discussion
    I need help with my duramax. It’s a 2003 GMC Sierra 2500hd. I started rolling coal one day (stock truck) and with the already hazy exhaust smoke, I knew that I had dropped an injector. I let my dad test drive it and he must have pushed it past the edge as it starts knocking and blowing out...
  9. 04.5-05 LLY Duramax Powertrain
    My truck has been leaking coolant and started knocking td I think it could be the injectors but I have no clue
  10. 01-04.5 LB7 Duramax Powertrain
    I installed a new set of injectors on my LB7 and after I put everything back together I could hear a slight knock. I ask a couple of guys and they told my that it sounds normal. I took the truck on a 150 mile trip and when i got home the knock was louder. I notice that I was getting white...
  11. 01-04.5 LB7 Duramax Powertrain
    After my truck has sat all night at work I start it up to head home...and there is a very noticable knock for about the first five minutes or so of driving. Any ideas?
  12. 01-04.5 LB7 Duramax Powertrain
    hey everybody. i recently got this dmax lb7 and i was told that the injectors were replaced around 20000 miles ago. it is a retired formans truck from a local company here near me. anyways, i noticed a knock upon crusing speeds, so i took it the the dealership in hopes of getting new...
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