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Diesel Particulate Filter Blocked


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#1 JSC

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Posted 03 March 2019 - 03:30 PM

This is a well known issue. I filled up my Citroen C5 1.6 2008 and the dreaded DPF at risk of being blocked came up as soon as I switched ignition on.

Does any one have any positive experience of using the fuel additives to reduce this problem or even prevent it?


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#2 paul.h

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Posted 03 March 2019 - 08:34 PM

I would have thought this warning would come on when the engine is revving, not at start up, since it is sensed by an increase in the pressure drop across the filter. If you follow the 2 pressure pipes from the dpf they should go to a sensor which might be faulty. Rather than trying additives to clean the dpf it could be removed and washed out to remove the ash built up.

 

The car already has an addtive, the eolys fluid which is injected to the fuel tank every time it is filled up with diesel. This should last about 80k miles when it will need topping up but a warning message should be given when it needs doing.



#3 JSC

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Posted 08 March 2019 - 04:07 PM

I have an answer, one I am not sure I like, but understand.

 

My car has completed 120,000 miles with the majority done long distance at high speeds. So, I was surprised when the DPF warning light came on as there should really no soot build up as such. What there is generated should have been burnt off. I took my car to Clive Atthowe in Norwich, who I have known a long time and totally trust, who specialises in engine tuning and has the franchise for DPF cleaning. He analysed the car and exhaust system and confirmed there is no or very little soot build up in the exhaust. The Citroen computer calculates based on mileage and use when it decides the Diesel Particulate Filter has come to the end of its life, irrespective of the condition of the filter. So, the only way I can clear the fault and avoid 'Limp mode', is to have the system cleaned and reset to zero. I appreciate it is a filter and filters have an end point. But in my case the computer says 'it has' when it definitely has not.

 

Anyway, a clean is definitely cheaper option than a new filter.


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#4 paul.h

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Posted 09 March 2019 - 07:47 PM

The car does this type of calculation for when the eolys fluid needs topping up since it does not have a level measurement but I was not aware it did it for the dpf needing replacement, I would check this at a Citroen dealer before doing anything since it blocking is shown by the pressure measurement. When cleaning the dpf, as well as water jetting it out, I have read that soaking with oven cleaner might also help.



#5 mickthemaverick

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Posted 29 May 2019 - 06:52 PM

I have been through the DPF cleaning with three different engines and in all cases the method worked well. Simply remove the DPF from the car, soak in a bath of "brick acid", available from any builders merchant for very little money, for 20 minutes. Then thoroughly flush and backflush the filter to remove all the sludge and refit to the car. Good for at least another 50000 miles in the three I have done. The cars were C4 Picasso 1.6HDi, C5 2.2 HDi and Xantia 2.0 HDi.

:) :) :)


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#6 paul.h

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Posted 04 June 2019 - 10:26 AM

I have also read that oven cleaner (caustic soda) can work after a water flush first and then again after. Just wonder if the brick acid dissolves the filter.



#7 mickthemaverick

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Posted 04 June 2019 - 11:16 AM

I was a bit concerned about that myself but I left an old filter in the acid for 3 days as a trial before cleaning mine. It had no visible damage so I went ahead with the cleaning and got good results. It is of course important to thoroughly flush through both ways after the bath, I used the pressure washer. I got the idea originally from a french citroen mechanic in Calais when I called in for a check in my friend's C4 Picasso!


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