[LvR]

yep

 

[eoptio]

ok thanks, would you have any recommendations as best way to do this?

thanks

 

[LvR]

I have never done a Renault FAP ..............on the MBs I have done I removed the FAP from the car and with a high pressure car cleaner (Karcher etc) and while using a broad fan nozzle at about half pressure (adjust spray pattern on nozzle) clean out all the loose debris you can while trying to blow down the little tubes you can see (its going to get real dirty around you ) - first from the inlet side and then in the reverse from the outlet side, repeat till see nothing coming out - make sure you try and cover each individual tube/channel. Now block the intake side and make it water-tight. From the outlet side pour liquid engine cleaner into the FAP . Go bother the wife or a case of beer while it sits overnight. Next day again use the high pressure cleaner to mechanically clean the thing from both sides alternatively till no dirt comes out. Once happy stand it on end in the sun and go have a beer - if you think its dry refit and experience bliss.


BEFORE you do this though .................... whats the result of the dp reading with the pressure sensor open to atmosphere I asked about before and are you 100% sure all of that small diameter plumbing including the nozzles and nipples are open and unblocked with no cracks on there at all? ............... is the scanner reading close to 0?

 

[eoptio]

ok thanks. the dpf and catalysator on the car are one piece, which might complicate cleaning. I have not yet got dp reading with sensor open to atmosphere, will try that later/tomorrow

 

[eoptio]

not yet tried the pressure sensor. In case that turns out not to be the issue I am considering changing the dpf and the dpf temperature sensor (as that was the initial fault code). As I understand it, the ecu does need to be reset for a new dpf, does anyone know how to do this (other than visiting Renault)? My diagnostic tool can do a forced regeneration but does not seem to have an option to reset the dpf in the ecu, would a forced regeneration do this? Is there an issue driving with a new dpf without resetting the ecu?

thanks

 

[ours2012]

What interface are you using.
Strange it wont do a counter reset..

Its normally , do a regen, then tell ECU its a new DPF
Or just fit a new DPF, and tell ecu, its resetting counters..

 

[eoptio]

I am using maxiecu, pretty new to this though so perhaps i am not looking in the right place in the software. What diagnostic tools are known to be able to reset the ecu after dpf change?

 

[LvR]

I really think you need to re-read the whole thread again and understand that an error code is not an instruction to replace a specific sensor or component even if that sensor is mentioned in the error code - the error code is telling you that the ECU is detecting values on a parameter off a sensor that is not as expected .........................


The sensor itself can be faulty but often is not .................


The sensor can be ok and a horde of items affecting the sensor's readings may be causing the sensor to report funky readings.


Again - a blocked DPF/FAP, if properly identified, is a mechanical condition/state that can be fairly easily and cheaply rectified without resorting to replacing unnecessary sensors or DPF/FAP exactly as per your original enquiry

 

[eoptio]

thanks, yes I'll have a look at it all again this week following previous suggestions.

 

[ours2012]

You can buy a cleaner that you put inside the dpf and it will break down the soot,,
But you still have to get the DPF off, an after market DPF on your car is 480£.
BUT always a but, its getting any pipework/sensors fitted onto/in the dpf out..
These very rarely come out without destroying them...

Hence the cleaning fluid , ..
If it was my car. I would be using a cleansing fluid, I would be ignoring any sensor readings at this point, until I got clear water running through the DPF after the cleansing fluid..

 

[eoptio]

thanks, yes i think next step after testing the pressure sensor as suggested is to have a go at trying to clean the dpf off the car. Will have to cut the exhaust to take the dpf off a it's all in one piece. Already had a look at taking the temp senor out and I doubt it's going to come out in one piece so will leave that in when cleaning dpf. Will any engine cleaner/degreaser be ok?

 

[ours2012]

Pressure sensor wont read, no pressure.. so putting a new one on, or testing the sensor wont help,
Would take the DPF off, and clean it.
Either way its got come off,.
JUST make sure you get the back part of the exhaust to the DPF off first, as easier to do on the car, than take the front part off and try and get the back off afterwards

 

[eoptio]

ok, do you mean cut the exhaust after the dpf first then unbolt at the front?

 

[Fraser L]

you should be able to unbolt both infront and after the DPF.

 

[LvR]

Never had to do one myself on this motor so cannot comment, but from https://www.ebay.co.uk/itm/Renault-...III-08-15-1-5-DCI-K9K-DPF-Diesel-Particulate-Filter-Cat-Converter-/272853447890 it sure doesn't look like cutting is involved ................. perhaps on yours the fitting technique was specific and different for some reason?

 

[eoptio]

thanks, that looks different from what's on my car, which looks like this https://www.cats2u.co.uk/home/32695-renault-megane-15-12-09-08-12-diesel-particulate-filter.html, it looks like the whole original exhaust is in one piece

 

[eoptio]

hi

I have taken the DPF off, pressure washed it form both sides, filled it with liquid engine cleaner and let it soak overnight. When washing it with the pressure washer I noticed some bits of what looked like the filter coming out so after soaking it overnight I rinsed it out repeatedly from both sides with a garden hose instead. Lots of gunk came out. Stopped when I had clear water running through it and now it's standing in the sun to dry. I forgot to take the reading from the disconnected pressure sensor, rubber hose looks fine though.

I'll leave it to dry for a few days, if it's worked as hoped, after putting it back on is anything special required, ie forced regeneration, or should it just work if all is ok?

 

[ours2012]

Just fit and take the car on a long journey, leave radio and heater OFF, and try not to use the brake pedal ,, get it over 50mph, good chance all the soot will then be forced out..

 

[LvR]

:iagree:

 

[eoptio]

i haven't got round to putting the dpf back on, but having a look at it this morning, it looks like the pressure washer may have been too much for the catalytic converter side of the unit (dpf and catalytic converter are in one piece on this car). It's taken chunks of it out, see pic. Any harm in fitting it like this?