The Diesel Truck Site  

Go Back   The Diesel Truck Site > Diesel Truck Forums > Chevrolet & GMC Duramax Forum

Chevrolet & GMC Duramax Forum Chevrolet & GMC Duramax Forum


Reply
 
Thread Tools Display Modes
  #1  
Old 01-09-2011, 09:58 PM
stodg43's Avatar
stodg43 stodg43 is offline
'Old Fart'
 
Join Date: Dec 2010
Location: West of Trinidad, CO
Posts: 62
Default Blowing Blue Instead of Black Smoke, Chevrolet Duramax

the other day I was pulling a trailer and stopped to visit with son. After about 10 minutes I pulled away from the curb and noticed blue smoke coming from the exhaust. Asked a friend, if it was a problem he stated that I was getting to much air into the engine and needed to increase exhaust size to eliminage this problem. Ever heard of this??

I recently put a BHAF on the truck.

Opinions, help, what do I do now?
Reply With Quote
  #2  
Old 01-09-2011, 10:12 PM
MnTom's Avatar
MnTom MnTom is offline
Administrator
 
Join Date: Nov 2010
Location: Near Duluth, Mn
Posts: 4,914
Default

Can't say as I have ever heard of an exhaust causing blue smoke. How cold was it when you took off? Generally the smoke like you saw is caused from cylinder temps dropping and not all the fuel was burning (even though the water temp was normal) or a possible injector issue or even a slight amount of air in the fuel line.
__________________
1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
Reply With Quote
  #3  
Old 01-09-2011, 10:23 PM
stodg43's Avatar
stodg43 stodg43 is offline
'Old Fart'
 
Join Date: Dec 2010
Location: West of Trinidad, CO
Posts: 62
Default blue smoke instead of black

Outside temp about 40, it was just a puff of blue smoke. I am used to seeing a puff of black smoke when I start off. Truck is stock and doesn't normally show smoke of any color. Just wondering why?

Going to remove muffler and replace with straight pipe to see if this will help!! maybe not help but get rid of blue smoke.
Reply With Quote
  #4  
Old 01-09-2011, 10:26 PM
MnTom's Avatar
MnTom MnTom is offline
Administrator
 
Join Date: Nov 2010
Location: Near Duluth, Mn
Posts: 4,914
Default

Sounds like maybe an injector screwing up a little?
__________________
1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
Reply With Quote
  #5  
Old 01-10-2011, 12:26 AM
dknaks's Avatar
dknaks dknaks is offline
**childish comment here**
 
Join Date: Dec 2010
Posts: 168
Default

I would guess its either an injector or a fueling issue. May have been air in a line.
__________________
-Dustin
07 6.7 3500 dually, Blackmaxx, SB DD3600. Fully deleted.
Reply With Quote
  #6  
Old 01-10-2011, 12:24 PM
Regen Regen is offline
Senior Member
 
Join Date: Jan 2011
Location: Colorado
Posts: 68
Default

There also could be problems with an o-ring, or possibly cracked injector cup.
__________________
2004.5 GMC Duramax, 4x4, Extended cab, Short bed, Bought it used so; unknown injectors, unknown turbo, unknown upgrades, but what a ride and 26 MPG
Reply With Quote
  #7  
Old 01-10-2011, 04:58 PM
MnTom's Avatar
MnTom MnTom is offline
Administrator
 
Join Date: Nov 2010
Location: Near Duluth, Mn
Posts: 4,914
Default

Quote:
Originally Posted by Regen View Post
There also could be problems with an o-ring, or possibly cracked injector cup.
So, what would be the best way to diagnose those problems?
__________________
1996 RAM "Custom Ground" 100 plate 3/4 forward, 300 injectors, 16.5 timing, Goerends Auto = 365HP, 833TQ Third Gen Rims, Aluminum Headache Rack
Duct Tape can't fix stupid, BUT it can muffle the sound
Reply With Quote
  #8  
Old 01-10-2011, 08:42 PM
dknaks's Avatar
dknaks dknaks is offline
**childish comment here**
 
Join Date: Dec 2010
Posts: 168
Default

Ya should also list truck in signature so we know exactly what we are dealing with.

If it was an o-ring or a cup wouldn't it become even more noticeable at higher rpm?
__________________
-Dustin
07 6.7 3500 dually, Blackmaxx, SB DD3600. Fully deleted.
Reply With Quote
  #9  
Old 01-11-2011, 09:45 AM
Regen Regen is offline
Senior Member
 
Join Date: Jan 2011
Location: Colorado
Posts: 68
Default

Quote:
Originally Posted by MnTom View Post
So, what would be the best way to diagnose those problems?
I was reading about those and they didn't say how to diagnose the problem. So, now I need to read up a little bit more to find out about them.
__________________
2004.5 GMC Duramax, 4x4, Extended cab, Short bed, Bought it used so; unknown injectors, unknown turbo, unknown upgrades, but what a ride and 26 MPG
Reply With Quote
  #10  
Old 01-11-2011, 10:36 AM
dknaks's Avatar
dknaks dknaks is offline
**childish comment here**
 
Join Date: Dec 2010
Posts: 168
Default

If you need to diagnose down to a cylinder you can use a temp gun on the manifold and see which cylinder is putting out more heat then the others, that will tell you where to start looking.

Another thing to also check is to pull off your intake tube from the turbo and make sure there is no oil coming through.
__________________
-Dustin
07 6.7 3500 dually, Blackmaxx, SB DD3600. Fully deleted.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 09:31 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Skin & Style Created By: Mopar1973Man.Com
Copyright 2012 Diesel Truck Site