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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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