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  1. 04.5-05 LLY Duramax Powertrain
    While driving the truck I can be on throttle cruising at let's say 12k at the rail. If there's a stop sign coming up I'll let off throttle and the rail pressure will stay at the cruising pressure (12k in this example) and then start creeping up (so demanded is about 4-5k and actual will be...
  2. 04.5-05 LLY Duramax Powertrain
    I know this question has been posted in varius forms and forums, but i have added to many variables into the equation to immediately jump to a head gasket leak. The truck is a 4.5 2500hd gmc, mods that might have influence on the issue are, sinister egr delete, and banks intercoolers. The truck...
  3. 01-04.5 LB7 Duramax Powertrain
    Hi, I have a 2003 6.6 I have about 250,000. Replaced injectors and glow plugs about 4,000 miles ago. Really like this pickup. About a month ago, noticed kind of slugishness. Later that day, started poorly and barely got it in the garage. Been sitting for a month while I was overseas. Came...