I'm a volunteer firefighter. We bought a new brush truck, based on a Chevy 4500 diesel. Every minute or two it makes this obnoxious sound. Reading this article, I finally figured out what it was caused by:

To get rid of particulate
matter, the diesel manufacturers came up with what's called a DPF
(diesel particulate filter). But this catalytic filter becomes poisoned
if sulfur dioxide is pumped through it. So as of 2007, the standard for
diesel fuel was revamped as well, and fuel refineries had to reduce
sulfur content to no more than 15 parts per million (now known as
ultralow-sulfur diesel). The DPF is placed in the exhaust system in
front of the muffler
and looks like a catalytic converter used on gasoline engines. It
captures particulate matter in its inner core. Periodically, the DPF
has to be taken up to high temperatures to burn off the matter it has
collected. This is called regeneration or postinjection regeneration.
The idea is to inject fuel into the exhaust that has been vaporized,
and when the fuel comes into contact with the DPF, an exothermic
reaction heats it up and incinerates the plug of soot. (Squirting fuel
down the exhaust? Gee, I wonder why the newer models have poorer fuel
mileage.) 

They're spraying fuel on the DPF!

• Fri, 05/01/2009 - 08:18
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• Thu, 08/20/2009 - 05:55
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• Fri, 10/02/2009 - 09:26
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