Duramax Diesels Forum Truck of the Week
Old 08-02-2008, 05:41 PM
On a Time Out
Join Date: May 2008
Location: ATS Extreme trans
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Default NEED HELP 03 lb7 with EGR????

Have any of you seen this? Its a 03 lb7 IHI turbo with a EGR system!! Is there a special tune that needs to be loaded into it to make it run better? Could GM have loaded a regular lb7 tune into it and thats why its not running worth a shit?
Since he picked it up from the dealer after they worked on it the truck has like 150hp. The truck ran fine before it went to the shop. Now it has no power.
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Old 08-02-2008, 05:58 PM
JOHNBOY's Avatar
< Rocking the Big Single!
Join Date: Aug 2006
Location: Saegertown, Pa
Posts: 2,652


The turbo housings are different but the computer still has to pyshical (sp?) control over the turbo like it does on the LLY , LBZ, and LMM. Are you seeing low boost numbers and and laggy response? If so check the wastegate linkage. It might be stuck and holding the wastegate open making the truck a pig.
The Big Stick
2002 GMC 2500HD Crewcab Long Bed LB7 ZF6 Southbend Triple Disk clutch, Alive with EFI Live from Mcrat Racing, Crower rods, LB7 cut pistons by JB, Cam and push rods by EEP 80% Extrudehone injectors, CP3 X 2, Socal Diesel Springs and Ti Retainers, A/C delete by JB

The wifes truck
2007 Classic Chevy Crewcab Shortbed LBZ 6speed Allison Loaded Basicly stock. Little EFI tune and a Trans Go Jr.
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