Duramax Diesels Forum Truck of the Week
  #16  
Old 02-13-2018, 10:47 AM
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Let me rephrase DEF will dose more during a regen ,
NOx is only created under HIGH temp/HIGH pressure. Def should only be injected after both the engine and Exhaust heat up. In very small quantities , 50:1 ratio for every 50 gallons of diesel 1 gallons of DEF is used ,There are several temps sensors in the exhaust ,Def will only react like it is supposed to (with SCR catalyst) under high temps.

The sixth injector is located before the DOC and Will only dose fuel if temps are not high enough


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  #17  
Old 02-13-2018, 10:49 AM
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Default LML white smoke

Quote:
Originally Posted by Columbus450 View Post
Let me rephrase DEF will dose more during a regen ,
NOx is only created under HIGH temp/HIGH pressure. Def should only be injected after both the engine and Exhaust heat up. In very small quantities , 50:1 ratio for every 50 gallons of diesel 1 gallons of DEF is used ,There are several temps sensors in the exhaust ,Def will only react like it is supposed to (with SCR catalyst) under high temps.

The sixth injector is located before the DOC and Will only dose fuel if temps are not high enough


And no white clouds of smoke is not normal especially while driving

Noticeable smoke while the truck is parked is normal ( during a regen)

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  #18  
Old 02-13-2018, 12:00 PM
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Quote:
Originally Posted by NC-smokinlmm View Post
You have a cracked DPF...
This does not always indicate a cracked DPF.
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  #19  
Old 02-13-2018, 12:54 PM
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Quote:
Originally Posted by Hoser View Post
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.
You are correct sir. Most of the time you have a Haze during a region is because you have a cracked DPF and it is allowing the particles to escape the exhaust the white smoke you see is also unburnt diesel fuel that escapes through the cracks.
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  #20  
Old 02-13-2018, 04:05 PM
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Quote:
Originally Posted by NC-smokinlmm View Post
You are correct sir. Most of the time you have a Haze during a region is because you have a cracked DPF and it is allowing the particles to escape the exhaust the white smoke you see is also unburnt diesel fuel that escapes through the cracks.
Perfect, now i have a even better excuse to run my straight 5" and make her LOUD
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  #21  
Old 02-13-2018, 04:56 PM
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Perfect reason to delete


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