martin

Hello from Czech republic,as I am reading your "DPF forum", I see that you have the same problems with DPF like me. At aprox. 6500 km DPF switch on the light, and I should go at more than 40 km/h and 2000 rpm/min in order that it disappear. Several times it helped, but later DPF start blinking. My Mazda dealer said, that I was going in the town, that it is my problem and I should pay cca 160 EUR for the procedure of cleaning of DPF and especially for changing expensive Dexelia oil (it was diluted by fuel oil). I hoped that this problem is solved and won´t never repeat and on recommendation of dealer start driving at more rpm. But the DPF start ligthing more frequently and finally start again blinking (at aprox. 13000 km). Since I was sure, that it is not my mistake, I wasnt´t ready to pay again for clearing filter (my car has 3 years garancy) - I asked my dealer and then Czech Mazda representation, if they have any reasonable solution. From they answer I feld, that they are not able to solve it, so I decided to turn off DPF by myself. It is not so easy, since there is catalyst (in frontal) and DPF filter in one unit. We should cut the unit in half (carefully in order not to destroy catalyst), than make several holes into DPF (with 18 mm drill) and then boil unit together. After that, I went to Mazda dealer in order to reset ECU (DPF was still blinking remembering that the active regeneration didn´t pass sucesfully). After reseting ECU I was really happy, but only for about 50 km, when DPF start blinking - as I found out later, it was caused by pressure sensors, which measures pressure diference before and after DPF (after destroying DPF the pressure on both sides was same and the electronic recognized holes in DPF). We solved it by removing of pipe before catalyst where are aproximatelly same pressures like before DPF (in case when DPF is empty). Then the problem seemed to be solved but after aprox. 60 km it started again blinking. After another 20 km, I stopped engine and start again and it was going without blinking cca 250 km. Then again blinking DPF, repeated switching of engine off and on didn´t helped. But after stopping engine after aprox. 150 km, and switching again on DPF didn´t appear by now. I made several trips (from short in town to longer) - total aprox. 350 km. I am nearly believing that ECU "adapted" to damaged DPF... I thing, that the main possitives of destrying of DPF are: - the DPF won´t never switch on the light (PM aren´t acumulated in DPF, so the pressure on sensor isn´t increasing) - due to low pressure in DPF, ECU won´t make any active regeneration (no additional post injections and related problem with increasing level of oil - diluted by fuel-oil) + better consumption The main negatives are: - maybe I lost the warranty on car (for certain on DPF) - I´m not sure, if (and how often) will DPF start blinking - my car isn´t now so ecological I will be grateful to anybody, who send me his own experiences with DPF. In my service manual (part 8-18) I read, that after changing oil must be reseted engine ECU - I want to change oil by myself (there are cheaper alternatives to original Mazda Dexelia - specifications ACEA-C1 or JASO DL-1) and I don´t want to go to Mazda dealer. DO YOU KNOW ANY TRICK HOW TO RESET IT BY MYSELF? I wish you a lot of happy km and hope, that will be soon found some reasonable sollution of DPF problem. Martin My e-mail: muj.samojed@seznam.cz