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My 2004 duramax 2500 GMC is puffing out white smoke after the engine reaches running temp.No smoking at cold start.
i have 329,800 km (200,00 miles). i replaced 4 injectors at 214km in 2013 and 4 injectors at 272km in 2016.
i also have a Bullu Dog chip/prformance tuner
trying to sell but the big white smoke is an issua




in2016. Looking for insight.
 

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LLY or LB7? Most likely needs one or more injectors again. This is especially true of aftermarket reman injectors although I have had a few replacement GM injectors go bad with less than 75,000 miles on them. The other possibility could be an EGR cooler leaking internally if your truck has EGR. You would also notice coolant loss with an EGR cooler leak.
 
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