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I'm looking at buying a 2001 Duramax for my son. We took it out for a test ride on Sunday and it very well. It only has 110k on it, but when I stomped on the fuel peddal it did blow out some smoke ( Black not blue ). Any ideas why? The truck is all stock. Thanks
 

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My brothers 03 will do the same if he has babied it a lot. Kind of like its got a carbon build up and is burning it off. I'm assuming it wasn't a signifigant amount or was it very noticable? If it really is a stock tune and minimal smoke, i personally wouldn't worry about it.
 

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do a vin check at the dealers see if the injectors has ever been replaced.
 

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Mine was same way if i baby it it seems to smoke more after once or the air filter is dirty.
 
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