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04-18-2010, 11:34 PM
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Registered User
Join Date: Feb 2010
Location: Poulsbo, wa
Posts: 42
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Black & White smoke and a knock?
In addition to the GMC I have a 07 classic 2500HD Duramax.
Today I had to get on it to pass and I got a huge could of black smoke that turned white when I got off the gas and it included what I would describe as a ping if it was a gas rig whit low octane gas. No codes and at cruse no problems but it is also smoking at moderate acceleration also, just not as bad and no white or ping. I checked the air filter it is clean and the gauge is at the bottom of the green zone where I would expect it with a new/clean filter. No mods done to the engine except to open the air box and remove the cat and that was about 8K ago. Has 48K on it. Any suggestions at to what it might be?
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07 Chev 2500HD Classic Project Ranch Hand, Hauling A$$ since 1973  I was told this Project had a L-72 427 425HP, It did not. It does have a 427 block and parts from various 427 motors. It will end up with a nice strong 454 in the end. It has not been run for 20+ years Frame up restoration started2/15/2010 
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