Fap Builds Up Soot Very Fast

[Woolf]

Hello,

 

I have a Xsara Picasso 1.6 HDI (110) FAP. I have had it for a year or so and I notice that the car seems to regenerate the FAP very often. During a 500km trip, signs of regeneration (consumption up, back mirrors warm) every 50km!

 

As I have Lexia, I checked a couple of Days ago and "Average distance between regenerations over the last 5 cykles" was 51 km. Soot load was 35%. I then drove about 20km (city/motorway), and plugged in Lexia when I got back home, now the soot level is 84%(!). Drove again, this time only 5km, and lexia says soot load 90%...

 

It seems to complete regeneration cycle, as the soot load drops to low levels:

Checked this directly after regen and it was 5%

 

I have looked under the car and the eolys tank is half full.

It doesn´t consume any oil (oil level tends to rise a bit, diesel contamination?)

 

The car drives fine but fuel consumption is a bit too high. I guess this is due to the frequent regenerations, otherwise it probably would have normal consumption Acceleration is fine however not as good as my mother´s 307 with the same engine.

 

Codes: p1351, glow plugs not supplied (i don´t remember the whole messsage)

 

So, Is it possible that the Engine can generate than much soot, triggering regens every 50 km?? Or could a faulty exhaust pressure sensor make this happen?

 

Thankful for any input,

 

Woolf

[paul.h]

Welcome to the forum.

 

Can you see the pressure sensor values either side of the FAP on the Lexia ? If both are high then maybe there is an exhaust blockage problem. How many km has the car done ?

[Woolf]

Hello,

 

thanks for your reply!

 

In Lexia I can't seem to see the sensor values on both sides, only the inlet/outlet difference, which was 0.0 at idle (739 rpm).

 

The car has done 140000 km. According to previous owner, the FAP has been washed out by some garage a year ago, since he got "Unblock diesel filter"

 

Your comment about exhaust blockage was interesting, haven't thought about that. The rear muffler does not look entirely like the ones one can see att sites for spare parts, maybe it has different properties...like too much or too little back pressure. The tail pipe is sooty, whereas my mothers´ 307 with identical engine hardly make my fingers dirty when I stick them in

 

BUT: had a closer look at the eolys tank and it is NOT half full as i thought before, that must have been a shadow tricking me...there is hardly anything left maybe 1 cm, and I wonder if the pump has been able to suck it up. When testing the pump via Lexia it sounds like it is running "dry".. will now buy eolys  and start in that end..

 

Stupid question perhaps, but would no eolys lead to more frequent regenerations?

 

Again tank you,

 

Woolf

[paul.h]

Looks as if you have found the cause of the problem. The eolys fluid is needed to allow the dpf to work by reducing the temperature needed to burn off the soot. Without it the dpf will quickly block up. You could also try removing the dpf and jet washing it to remove as much soot as possible to help once the eolys is topped up. Our C5 has a dpf and inside the tailpipe is clean with no sign of any black soot, just shiny metal.

[Johndouglas]

Looks as if you have found the cause of the problem.

But surely, if there was no Eolys, the low warning would display at every new start of the engine?