Duramax Diesels Forum Truck of the Week
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Old 02-12-2018, 12:24 PM
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Default LML white smoke

My 2015 LML is still stock as it has 34,XXX miles, i am about to go w a switch and 5 tunes and exhaust and what not but today i noticed i cloud of white smoke after getting on it on to the FWY. Tip is clean and i have not noticed it untill now (have had truck for about 3,XXX miles. I did finally have to add DPF fluid and used the only brand that MAVERICK carries here in SLC as i assume most of town uses this.

Have you seen white smoke from the fluid if it happens to be in a re-gen at the same time?
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Old 02-12-2018, 12:25 PM
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it seems it will dump more if i drive it real easy for a while and let it load up , injector over fueling?
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2015 GMC Denali 4X4 CC/SB 2500 LML
20" MOTOs
Delete/EFI/5" straight soon to come




2008 GMC 2500 (SOLD)
EFI,all deleted,rode hard,stayed together

2009 Chev 2500 (traded) EFI, all deleted, rode just as hard as her ^^^, stayed together
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Old 02-12-2018, 01:09 PM
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Feel any loss in power? Notice more regens then usual? Can you look at balance rates?
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Old 02-12-2018, 03:03 PM
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seems to be the same stock dog she always was. I just have the OBD II code ready and clearer, dont think it will give me rates. Could it be unburden DPF fluid?
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2015 GMC Denali 4X4 CC/SB 2500 LML
20" MOTOs
Delete/EFI/5" straight soon to come




2008 GMC 2500 (SOLD)
EFI,all deleted,rode hard,stayed together

2009 Chev 2500 (traded) EFI, all deleted, rode just as hard as her ^^^, stayed together
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Old 02-12-2018, 03:58 PM
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9th injector may be stuck on. Just had a 2015 Denali do it to us and it torched the cat into pieces. All covered under warranty.
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Old 02-12-2018, 04:43 PM
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Quote:
Originally Posted by ikeG View Post
9th injector may be stuck on. Just had a 2015 Denali do it to us and it torched the cat into pieces. All covered under warranty.
if so the DP fluid tank should run dry quick right?
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20" MOTOs
Delete/EFI/5" straight soon to come




2008 GMC 2500 (SOLD)
EFI,all deleted,rode hard,stayed together

2009 Chev 2500 (traded) EFI, all deleted, rode just as hard as her ^^^, stayed together
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Old 02-12-2018, 04:49 PM
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9th injector sprays fuel in the downpipe for regeneration

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Old 02-12-2018, 04:56 PM
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I regularly see huge plumes of white smoke when I’m in regen and getting on it, sometimes it will be so dens it will completely block my view of all the vehicles behind me. The DEF and 9th injector have nothing to do with each other, other than the fact they are both part of the emissions system.
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Old 02-12-2018, 05:10 PM
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how/where does the DEF get shot into the mix?
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2015 GMC Denali 4X4 CC/SB 2500 LML
20" MOTOs
Delete/EFI/5" straight soon to come




2008 GMC 2500 (SOLD)
EFI,all deleted,rode hard,stayed together

2009 Chev 2500 (traded) EFI, all deleted, rode just as hard as her ^^^, stayed together
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Old 02-12-2018, 05:23 PM
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The ninth injector injects diesel into the exh pipe to bring the exhaust gases up to a higher temperature, The DEF dosing injector will not dose until a regen process takes place So it can reduce nox Emissions it's usually found near the SCR and DPF filters
Sounds like you're having a over fueling issue take it back to the dealer it's under warranty


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Old 02-12-2018, 06:05 PM
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I get the white smoke when I get on my 16 toward the end of a regen. My '11 did it as well past 100k.
Mine isn't road blocking though, just a good haze. You might want to have it checked at the dealer if its that bad.
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Old 02-12-2018, 06:43 PM
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You have a cracked DPF...
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  #13  
Old 02-13-2018, 10:01 AM
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it only did it bad once, then i got it to do it a little more one the freeway and now it is all clear , seems it was right at the end of the re-gen.
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2015 GMC Denali 4X4 CC/SB 2500 LML
20" MOTOs
Delete/EFI/5" straight soon to come




2008 GMC 2500 (SOLD)
EFI,all deleted,rode hard,stayed together

2009 Chev 2500 (traded) EFI, all deleted, rode just as hard as her ^^^, stayed together
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  #14  
Old 02-13-2018, 10:03 AM
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Quote:
Originally Posted by Columbus450 View Post
The ninth injector injects diesel into the exh pipe to bring the exhaust gases up to a higher temperature, The DEF dosing injector will not dose until a regen process takes place So it can reduce nox Emissions it's usually found near the SCR and DPF filters
Sounds like you're having a over fueling issue take it back to the dealer it's under warranty


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This is incorrect. The DEF is always being injected and used while the truck is running, as long as itís not frozen. 9th injector only injects fuel during a regen to heat exhaust and to burn off accumulated mass in the DPF.
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  #15  
Old 02-13-2018, 10:04 AM
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I have had my truck at the dealer numerous times and have mentioned my clouds of white smoke, they say it’s normal. . . . .
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