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slow acceleration
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  1. 01-04.5 LB7 Duramax Powertrain
    Figured I'd try posting on here before taking the truck in for diagnostics I have 2002 gmc sierra 2500hd stock duramax. Ever since I got the truck it's been lacking power. I have more power while towing with my 1500 silverado than I do with this truck right now. No check engine lights...
  2. 01-04.5 LB7 Duramax Powertrain
    Hello everybody, Been trying to diagnose whats up with my lb7, truck is a bone stock 02’ chevy 2500HD it has 250,000kms with the stock exhaust no muffler. Truck screams at full throttle but feels like its going nowhere. My buddy has two lb7s and both feel way quicker. Ive replaced the...
  3. General Discussion
    I have a 2015 Duramax LTZ Dually with 317k miles that was deleted around 280k. Never really had any issues with the truck. I left the truck idling in the driveway for about 45 minutes and when drove off it took forever to accelerate to 40mph no check lights or traction control lights are on...
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