If it has a DPF filter, there never should be any smoke whatsoever. If it is clogged there are sensors on both sides of the filter to see the pressure difference between inlet and outlet, to tell if it is clogged. These readings are able to be read with the diagnostic computer. The way a DPF works is- the engine computer senses the need to regen and over fuels a tiny bit, usually with an injector downstream after the turbo. The extra fuel hits the catalyst face in the DPF and causes the burn. This burn results in ash which is collected in another part of the DPF, which eliminates smoke and harmful particulates from entering the air. There are also inlet and outlet temperature sensors, as well as NOx sensors. You have to really understand the system to interpret the readings and do diagnostics. Your tech should have done a forced regen, too. Mark.
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Today's Featured Article - Uncle Cecil's Super A Lives Again - by Mike Purcell. A week or so out of most of my childhood summers was often spent with my Uncle Cecil and Aunt Sissie in the small East Texas town of Maydelle on their 80 acre farm. Some of my fondest memories of these visits are those of learning to drive a tractor at the helm of Uncle Cecil’s 1948 Farmall Super A. Uncle Cecil was the second owner of this wonderful little tractor, but it was almost as though he had adopted an infant. The original owner was a man from Minnesota who bought her from a local dea
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