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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 09-22-2019, 11:36 AM   #1 (permalink)
mehoff400
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turbo gone bad?

hoping i can get some guidance. i cannot get my turbo to build boost. i have a hard time getting about 15PSI out of it. i have done a pressure test and that looks good. what other items should i look at before i start to remove the turbo?







truck has about 154,000 miles on it.

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Old 09-22-2019, 03:53 PM   #2 (permalink)
mehoff400
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after doing some more research and driving the truck around i believe it to be a up pipe or down pipe leak.


i hear a bad exhaust leak as i am driving.

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Old 09-22-2019, 07:23 PM   #3 (permalink)
68ss
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Check to see if you have pushed a boot off of your intercooler. This can happen and you can't build boost.
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Last edited by 68ss; 09-22-2019 at 07:23 PM.
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Old 09-22-2019, 08:36 PM   #4 (permalink)
mehoff400
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Was able to have my wife help me out. up pip is got a crack at the bellows
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