|
Title: rough idle during dpf burn off when cooler ambient temperature Post by: k0mpresd on December 28, 2012, 03:52:05 PM ever since the temperature outside has dropped from summer/warmer temperatures, the engine has started stumbling @ idle during a dpf burn off.
the tach doesnt show a stumble but you can definitely feel it. the engine idles very rough. when it was warmer/summer temperatures this was not the case. is there something possibly to adjust to help smooth it out? i guess this is just another reason to do a dpf delete but i dont have the extra $500usd for a delete pipe right now. ::) Title: Re: rough idle during dpf burn off when cooler ambient temperature Post by: Bazil_mb on December 29, 2012, 05:30:47 AM Hi,
Wich car and wich engine you have? Also post dtc. Regards Title: Re: rough idle during dpf burn off when cooler ambient temperature Post by: kenmac on December 29, 2012, 08:29:07 AM Pardon my ignorance, but define dpf. My brain can only store so many acronyms.
Title: Re: rough idle during dpf burn off when cooler ambient temperature Post by: ddillenger on December 29, 2012, 08:30:55 AM Diesel Particulate Filter
It basically traps the soot that would otherwise go out the exhaust, and when it gets full the engine dumps fuel so that it burns out. In the diesel truck world we either eliminate them completely, or ensure it doesn't enter regen (what burning it out is called) at idle. Of course this is over simplified. Title: Re: rough idle during dpf burn off when cooler ambient temperature Post by: k0mpresd on December 29, 2012, 08:53:43 AM yes, regen but not at idle seems a good solution. maybe i can find something about it in my damos.
Title: Re: rough idle during dpf burn off when cooler ambient temperature Post by: k0mpresd on December 29, 2012, 02:47:28 PM so the damos shows these 1x1 rpm values dealing with dpf it looks like:
PFltSrv_Rgn: -PFltSrv_nEngIncrIdlMax_C, 3200rpm -PFltSrv_nEngIncrIdlMin_C, 500rpm -PFltSrv_nMinClgDwn_C, 1500rpm -PFltSrv_nMinRgn_C, 1500rpm PFltSrv_RgnCond: -PFltSrv_nMax_C, 3300rpm -PFltSrv_nMin_C, 700rpm im thinking raising the last one to maybe 1000rpm or maybe 1200rpm instead of 700 and see what happens. i know that when youre driving the ecu wants to keep the revs >1500rpm too. |