On Fri, Mar 30, 2012 at 7:24 AM, John Ferrell wrot= e: > I am clueless on this subject! > Tell me what car and I will go learn something new... > The Book Of Knowledge has something on this, including the little light that says "Time to go for a drive to burn it off". I gather this is the "Italian tune-up" Michael was referring to. http://en.wikipedia.org/wiki/Diesel_particulate_filter On Fri, Mar 30, 2012 at 7:48 AM, Picbits Sales wrote: > My wife has had around 14 new Turbo Diesel cars over the past few years and > has never had a DPF regen. I have tried explaining to her that there is a > position inbetween full throttle and foot off throttle but she doesn't > believe me ;-) >Dom This is known as a "digital throttle control". I get tired of the marketers flacking "all digital" as a product feature, and sometimes refer to foolishness such as this as an example. On Sat, Mar 31, 2012 at 12:48 AM, Tamas Rudnai wrot= e: > > My light was never flashing, only came into continuous. When it does that > the ECU goes to 'limbo mode', meaning that you can drive home at a limite= d > speed but you need to bring your car to the mechanic asap. Actually they call it "limp" mode, as in it allows you to "limp home". One possible angle on the original question could be that, even if you burn more fuel, that is offset by the cleaner emissions, in the grams-per-mile sense. But I don't really believe that, and I don't expect you to, either. I often say that it's the stuff you can't see that's dangerous. "Smoke" is particles, which presumably fall to the ground as dust. As if to illustrate my point, the Wikipedia article mentions production of high amounts of NOx during the DPF "cleaning cycle". --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .