I have two Mercedes vehicles which are down on performance and have mpg's 25-45% lower than when I first purchased them and I believe the issue is down to the DPF factory fitted to both.
The C220 '09 Blueefficiency has been to Mercedes for a forced ReGen of the DPF after an engine management light came on, car in limp mode, 6 months ago. They stated 400% blocked (which seems nonsense, but that was the figure quoted). It was returned a few days later as although the warning light had gone, the car was significantly low on power. Another ReGen of the DPF and the car seemed OK. MPG was about 38mpg for months after that and I was told by Mercedes that this would improve as the car cleared the blockage. A month ago, for the first time ever, the car started to report 48mpg which I was ecstatic about. 300 miles later and a 80 mile run today on motorways reports 37mpg. I'm dumbfounded.
The GL420 '07 is also down on power and is producing lower than expected mpg of around 21mpg, down from 28mpg in the past. I've had the car 4 years and it has done over 100,000 miles, I am not a short trip driver and I plan to keep it another 2-3 years at least. The local garages diagnostics machine last week reported 7% Ash and 100% Soot on the left exhaust and the right exhaust reported OK for both. They tried to do a forced ReGen, but it wouldn't allow the option.
Like probably every other person who has resorted to forum sites after a DPF problem, I am confused as to what to do. Reading through posts on this site, I understand I have 3 options available.
Repair - Either by forced ReGen or third party DPF burn off (if I can find someone that does this).
Replace - Simply swap out the DPF for a new one.
Remove - Remove the DPF completely and remap the cars ECU so it doesn't complain about it being removed and doesn't try to run the DPF program periodically.
I would like to remove the DPF from both cars altogether, but I do not know whether the people who remap these vehicles are 'proven' - do they know what they are doing? AND, can the EGR be left intact or does leaving this in place cause additional problems?
Any advice people? Sorry for the long post. It would be fantastic to hear from somebody who has a Mercedes with a DPF they removed a few months ago and they've got 60mpg+ ever since, performance is like new and it cost £150, but anything less than that will be greatly received.
The C220 '09 Blueefficiency has been to Mercedes for a forced ReGen of the DPF after an engine management light came on, car in limp mode, 6 months ago. They stated 400% blocked (which seems nonsense, but that was the figure quoted). It was returned a few days later as although the warning light had gone, the car was significantly low on power. Another ReGen of the DPF and the car seemed OK. MPG was about 38mpg for months after that and I was told by Mercedes that this would improve as the car cleared the blockage. A month ago, for the first time ever, the car started to report 48mpg which I was ecstatic about. 300 miles later and a 80 mile run today on motorways reports 37mpg. I'm dumbfounded.
The GL420 '07 is also down on power and is producing lower than expected mpg of around 21mpg, down from 28mpg in the past. I've had the car 4 years and it has done over 100,000 miles, I am not a short trip driver and I plan to keep it another 2-3 years at least. The local garages diagnostics machine last week reported 7% Ash and 100% Soot on the left exhaust and the right exhaust reported OK for both. They tried to do a forced ReGen, but it wouldn't allow the option.
Like probably every other person who has resorted to forum sites after a DPF problem, I am confused as to what to do. Reading through posts on this site, I understand I have 3 options available.
Repair - Either by forced ReGen or third party DPF burn off (if I can find someone that does this).
Replace - Simply swap out the DPF for a new one.
Remove - Remove the DPF completely and remap the cars ECU so it doesn't complain about it being removed and doesn't try to run the DPF program periodically.
I would like to remove the DPF from both cars altogether, but I do not know whether the people who remap these vehicles are 'proven' - do they know what they are doing? AND, can the EGR be left intact or does leaving this in place cause additional problems?
Any advice people? Sorry for the long post. It would be fantastic to hear from somebody who has a Mercedes with a DPF they removed a few months ago and they've got 60mpg+ ever since, performance is like new and it cost £150, but anything less than that will be greatly received.
))))
