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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 10-12-2019, 02:46 PM   #1 (permalink)
SurfMotoDMAX
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What did I mess up?

Changed the thermostats on my 2006 LBZ. Pretty simple job of removing serpentine belt, then AC compressor, plus unplugging a few electrical connectors. Popped in the new thermostats, put everything back together and now the idle is way off and high, doesn't shift when it used to, seems like it is out of timing or some other weird electrical issue?

What did I mess up?

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Old 10-13-2019, 10:48 AM   #2 (permalink)
Rvn4me
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What are your codes?

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Old 10-14-2019, 02:28 PM   #3 (permalink)
Pure Diesel
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Did you check all the connectors that you took a part? Maybe something there. Did you lean on or while working maybe caused some other connection go bad?

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