Just wondered what the symptoms would be of driving a car with the DPF physically removed but not removed from software. I have bought a 407 with a blocked DPF. I knocked the innards out and am sending the ecu away to have the dpf element removed. I took a quick test run after removal and it kicked out a lot of black? smoke on acceleration. Is is maybe remains already in the exhaust or do I have bigger problems?? Only travelled a mile or two as a bit embarrasing
Guess I'll see what happens when the ecu comes back..
If you've knocked the innards out of the DPF then the differential pressure sensors will read zero, the system will think that the DPF is punctured and therefore prevent any regens and bring on the EML.
Maybe all that smoke is the soot that isn't being caught any more
Still, no smoke no poke
That is quite possibly the most blocked DPF I have ever seen......
Horrible hateful things.
2003 2.2hdi estate - mine 1998 Volvo 940 auto estate - also mine 2019 Citroen C3 something - the wife's PP2000 user, can help with faults / diagnostics in the Bournemouth area.
That is indeed blocked, I'm surprised it ran at all like that.
I think I'm going to go for all the soot left in the exhaust because there wasn't enough flow to push it through, Either that or the EGR's stuffed. Oh, that's going in the bin anyway
I would say that is the most likely reason for the smoke. Having removed the DPF the exhaust gasses are now flowing much faster through the system and getting rid of all the crud, I sure it will stop smoking after a good thrash up the motorway - or maybe even sooner.
I did this with my first 406 before we knew about fixing the software. It ran fine for a few months then went into limp mode permanently. That wasn't disastrous as it would still drag itself up to motorway speeds eventually. Oddly enough, mine didn't complain about the lack of differential pressure, eventual limp mode was caused by the additive ecu flagging a pump fault.
Remap with dpf/egr delete is your only realistic option, but you might not have to do it straight away.
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
rwb wrote:Good grief. It's worrying that it isn't showing faults already.
Siemens SID803 which I believe is a bench flash job.
How old is the car and how many miles are on it?
Hi,
That was the state of the DPF when I bought it. It has since been knocked out. The ecu is being posted away on monday. I have only driven a couple of miles without the dpf as I wanted a kind of before and after to see the effect of the remap. I drove over 20 miles home with the car after purchase and it was painful and embarrassingly slow
It's 10 years old with 130k. Last owner had it around 18 months and I don't think it ever saw an 'A' road let alone a dual carriageway or motorway...
If its consistently smoking then it suggests that something is amiss and could be the cause of the DPF blocking up in the first place.
Check for boost leaks, jammed EGR, dribbling injector etc.
2020 BMW 520d MSport Touring My Daily
2017 Dacia Logan MCV 1.5DCi Laureate Wifes
1996 Land Rover Defender 90 County SW 300TDi My Toy
2003 Ford Mondeo ST220 3.0 V6 My Other Toy
