Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

6.5 smoke white on start up

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  #11  
Old 01-25-2012, 10:17 AM
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Originally Posted by great white
Not sure what you guys got going on, but my 98 is good down to -20c (not plugged in) on a cold start with nothing but a quick puff of black and then clean running.

Now, pretty much everything is new (1 year or less) under my hood which is prob part of my trucks "good manners"

If you've got big rolling clouds of white or black, check your glows and glow circuit, or your engine isn't as healthy as you may think it is. Even one bad glow plug or a cylinder down on compression will give you symptoms like these in the cold.

Something is "off"....


You are just one of the lucky ones most of these truck will put white smoke on first cold or hot
 
  #12  
Old 01-25-2012, 12:16 PM
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Originally Posted by Crazy
You are just one of the lucky ones most of these truck will put white smoke on first cold or hot
Lucky?

Nope.

Everything up to snuff?

Yup.

---AutoMerged DoublePost---

Well, I should also mention I have reflashed my cold start glow cycle and afterglow in my PCM.

Not as much a factor with the duraterms, but every bit helps.

My trucks good starting manners are mainly accountable to new glows and a brand new GEP engine...
 

Last edited by great white; 01-25-2012 at 12:16 PM. Reason: Automerged Doublepost
  #13  
Old 01-25-2012, 08:01 PM
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Apparently brand new motors don't smoke white on start up, they smoke black? I'm missing something here but thanks for the input great white
 
  #14  
Old 01-26-2012, 03:58 AM
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Originally Posted by urban-burban95
Apparently brand new motors don't smoke white on start up, they smoke black? I'm missing something here but thanks for the input great white
The white smoke is normally raw diesel, the black smoke is partially burnt diesel.

White smoke is normally a bad glow plug, old glow plugs that don't quite reach temp or something not quite up to par in the glow circuit.

An engine with a good reciprocating assembly (ie: ring sealing) is just a cleaner burning unit than a tired engine and gets with the program faster on a cold morning.
 

Last edited by great white; 01-26-2012 at 04:02 AM.
  #15  
Old 01-26-2012, 10:38 AM
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all white smoke is is diesel fuel that isnt burnt hot enough
 
  #16  
Old 11-20-2014, 12:21 AM
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So a lot of white smoke for like 3 to 5 min. Means I have really bad glow plugs right. What if I'm driving and have white smoke
 
  #17  
Old 11-20-2014, 06:38 AM
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Originally Posted by Brian Troglin
So a lot of white smoke for like 3 to 5 min. Means I have really bad glow plugs right. What if I'm driving and have white smoke
White smoke on startup is a good sign that GP's are bad or the controller is not functioning properly and if you have white smoke while driving you could have trash in the injectors or they need replacing try some Seafoam in the fuel tank this may clear it up if they are not to far gone.
 
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