Chevy and GMC Duramax Diesel Forum banner


  1. LB7 injector blowby

    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...
  2. Cold LB7 Knock

    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?
  3. new truck, big problem?

    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...