Dpf Issue 2.0Hdi C5

[adpace8]

Hi guys,

 

Got an issue with my DPF and was wondering if anyone can provide information and advice.

 

My C5 doesn't seem to regenerating the particle filter when it should do (at 44% full) and seems to wait until I get a beep and a message saying 'risk of particle filter blocking'.

 

The current mileage is 124,500. I have had the DPF cleaned out at 114,000. It was upto 65% by 121,000, I then had a forced regeneration done and it is now blocking again. It is the second time since 12/11/16 I have had the message appear.

 

I will replace the DPF if it needs it but I want to be sure the system is working correctly before I do. When warmed up she sits at a steady 77 Celsius, I always have more than than a quarter of tank of diesel. She is serviced regularly by myself, oil and filter comes out every 6,000 miles. I use Shell Helix Ultra 5-30w APL oil and only put in Shell V-Power Nitro diesel, the slots fluid was tipped up at 114,000.

 

Any help as usual would be greatly appreciated.

 

Thanks.

[paul.h]

From your previous topic on fuel consumption  I would not think your driving is causing the dpf to block up, about 30 miles a day on motorways should keep it clean. Are you getting any messages to say the fuel tank filler is open - this takes a signal from the filler cap which has 2 magnets in it and are used by a switch to tell the car when it has been filled up so the eolys fluid is injected in to the fuel tank.

 

How is the 77°C being measured, if this is a code reader value from the engine temp sensor then it ought to be about 90 to 96°C since the thermostat is set at about 90°C. So it could be the thermostat needs replacing.

[adpace8]

Thanks for the reply Paul.h

 

I have had no messages in regards to the fuel filler magnets.

 

I measured the temp using a Bluetooth OBD2 adapter. According to the Haynes manual, the thermostat opens at 83 Celsius.

[paul.h]

I had not looked in Haynes until now so as you say the thermostat should start to open at 83°C and the engine fan should not cut in until 97°C so the engine should be between these values. When warming up you can see if the thermostat opens early by feeling the radiator top hose - it should not start to get warm until 83°C. The RTA manual for the C5 says normal regeneration will occur if the exhaust gases are hot enough, whether a faulty thermostat can prevent them getting hot enough I do not know.

 

When you topped up the eolys fluid did you use the correct one. I think your car (2008 C5 model 2004 to 2008) originally would have used eolys 176 (filler click fit green) so can be mixed with others apart from DPX42 but the others can not be mixed together since they may block up. This is from the Citroen service box procedure which mentions compatibility of the various fluids

 

3. Compatibility between additives

Additive DPX42 cannot be mixed with any other additive.

Additive EOLYS 176 can be mixed with additives EOLYS POWERFLEX and INFINEUM F7995.

Additives EOLYS POWERFLEX and INFINEUM F7995 cannot be mixed with each other.

N.B. : As the additive concentrations between EOLYS 176 and the two new additives are identical, there is no impact on the operating calibrations of the engine ECU.

CAUTION : It is not permissible to mix additives INFINEUM F7995 and Rhodia EOLYS POWERFLEX with each other.

[coastline taxis]

Asuming the car is serviced and timing belt is good . take the car for a bloody good run and work the engine through the gears then get it on the motorway ( out of rush hour/busy times) getting it up to 70/80 in 5th gear for a good half hour. While your doing 30ish miles a day on motorway you wont be getting a constant speed to build the pressures up in the exhaust and the egr sytem

[adpace8]

paul.h - the eloys fluid was topped up at a garage and they used eloys 176.

 

coastlinetaxis - I cover 60 miles a day 52 of which are all motorway, It was suggested to me before to try what you have suggested, but I never did it as the regeneration process on my C5 is a passive system.

 

I have now booked her in for a DPF replacement and new thermo.

 

The garage I use have told me when they fit the new DPF they will have to force a regen so the ECU has a baseline. I have had a forced regen before and would not be comfortable having another one. Revving a unloaded engine @4,000 rpm for 5-10 minutes, is this correct? does a new DPF need a regen performed?

[paul.h]

I could not find anything in Citroen's service box procedure for dpf replacement saying to do a forced regen and did not spot anything in the Haynes manual either, so I do not know if it is needed. I would think diy replacement of the dpf would not include a forced regen. The service box procedure for a forced regen is:

 

 

1. Recommended tools

Diagnostic station.

2. Forced regeneration of the particle emission filter

ESSENTIAL : Respect the safety and cleanliness recommendations that are specific to high pressure diesel injection (HDi) engines.

ESSENTIAL : Connect the vehicle to an approved gas extractor for this type of operation. Where the recommended installation is not available, carry out the forced regeneration of the particle filter outside the workshop, on an area of hard standing and remote from any inflammable materials.

N.B. : Vehicle with hydropneumatic suspension : Put the vehicle in the "high" position.

CAUTION : Check that the fuel level is sufficient (minimum 20 litres).

Start the engine and allow it to run at a temperature (60°C minimum).

Connect the diagnostic tool on the vehicle’s central socket.

Start the regeneration cycle Using the diagnostic equipment.

The regeneration of the particle emission filter proceeds automatically :

• Automatic control by the engine ECU
• Stabilisation of the engine speed at 4000 rpm : Operation with post-injection
• Change to idle speed (for 30 seconds)
• Stabilisation of the engine speed at 3000 rpm : Check of the effectiveness of the regeneration of the particle emission filter
• Change to idle speed

N.B. : Let the engine idle to cool down.

Stop the engine.

CAUTION : Wait at least one hour before carrying out any work on the exhaust line.

[coastline taxis]

forced regen are very traumatic for your engine and not something we advise people to do.   the miles you do each day arnt the issue  with your fault its the fact that they will be at various speeds. you need a constant speed/time so the ecu can complete a full regen.   Why would they need to do a forced regen on a new dpf. theres nothing in there to clear out and the ecu already has its values and limits.. replace the dpf top up eolys (if needed) and the jobs done so maybe think about a 2nd opinion

[adpace8]

That's exactly what I thought coastlinetaxis. I have now decided to have the thermostat done and leave the DPF if they insist on a forced regen.