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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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  #1  
Old 06-13-2006, 10:24 AM
ccole's Avatar
ccole ccole is offline
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Arrow 2006 LBZ black smoke on hard acceleration

Hello friends,
I have noticed that my 2006 LBZ will smoke black under hard acceleration, such as when the Allison kicks down while passing all them Fords . Its not a real severe smoke, but is noticable. It concerns me, since my LLY or LB7 never did smoke under hard acceleration. The truck runs/idles great all the time, but do you feel there is a need to have my injector balance rates checked, or did GM just "turn up the fuel" on these '06 models to acheive the 360 HP? Thank you!
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  #2  
Old 06-13-2006, 03:16 PM
hapaschold hapaschold is offline
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no smoke outta mine, just an annoying delay on "flooring it" even stepping on accel. gradually yields nothing i can see outta exhaust.
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  #3  
Old 06-16-2006, 05:39 AM
Dave Dave is offline
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Default Smoke on acceleration

I too have noticed my 06 LBZ smokes a lot under hard acceleration. Way more than the 01 LB7 ever did even with and edge hot juice box. Also way more than the 05 LLY ever did.

Is it normal for the LBZ to smoke so much under acceleration. all else seems normal.
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Old 06-18-2006, 05:45 AM
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ccole ccole is offline
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I guess if yours does it also.... I am hoping its just the nature of the LBZ motor. (I hope)
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Past Rides: 1978 Chevy 5.7 Dsl; 1982 C-20 6.2L Dsl; 1984 Chevy 6.2 Dsl; 1986 Suburban 6.2L Dsl; 1989 K2500 6.2L Dsl; 1994 F250 7.3L; (2) 1997 F250 7.3L; 2004 Duramax; 2005 Duramax; 2006 Duramax; 2007 Duramax; 1995 6.5 Non-Turbo; 1994 6.5 Turbo; 2001 F350 7.3L, 2005 GMC Duramax (Current)
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  #5  
Old 06-18-2006, 07:35 AM
Kennedy Kennedy is offline
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Catalyst (back psi) and EGR are the likely key contributors.
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