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  1. Duramax First Generation: 2001-2004 (LB7)
    Hi new to the forum here and this is my first post. Done a ton of reading here in the past and found lots of good info so I haven't felt the need to until now. Working on a 2002 Silverado 2500hd with the LB7 and Federal emissions. This truck vents the crankcase tube to the atmosphere at the...
  2. Duramax First Generation: 2001-2004 (LB7)
    Can a bad injector cause compression loss or blow by? 04 LB7 with 253K began a loud knock suddenly while towing. Towed it home and turned off each injector with EFI live until the knocking went away on #7. The compression test showed low (200) on that cylinder while all the rest were around...
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