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  1. Duramax First Generation: 2001-2004 (LB7)
    I started noticing a power loss, increase in water/trans temps spikes, and excess white exhaust smoke when towing in the mountains. Truck ran fine unloaded but still had excessive exhaust smoke when accelerating. No trouble codes displayed. I performed a boost leak test and at 10 psi I found a...
  2. Duramax First Generation: 2001-2004 (LB7)
    Hello all! I am new to the forum and am looking for help solving a boost leak with my EGR equipped LB7. The truck is somewhat smoky and definitely laggy. Weird thing is, I still see over 20 pounds of boost on my cts. When boost testing, the system won’t hold any pressure. You can’t hear it...
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