Doses Of Diesel Additive For Car With Particulate Filter

[72dudes]

Re my 2001 2.2 HDi.

 

Please can someone explain how this happens?

 

I read ages ago on this forum that every time the filler cap is opened and closed, the "special magnets" inside it somehow cause a dose of diesel additive to be delivered to the tank.

 

Is this right? How?

 

So by only filling up when my tank reaches a quarter full, am I prolonging the amount of additive? Or does this black magic somehow sense how much fuel is in the tank!!??

 

If I fill up every 100 miles, will the additive be used up more quickly?

 

If I take the filler cap on and off just for a laugh (!) will too much additive be delivered?

 

I could get quite worried about this ... lol

 

I asked the Service Manager at the local Citroen Specialist and he couldn't explain it (He said he was fine with old DS and CX models, but these new-fangled C5's!)

[kfk]

by removeing the fuel cap alone it doesnt inject the additive.

But if you remove the fuel cap and add fuel the computer for the additive calculates how much fuel has been added and injects a proprtionate amount by using information from the fuel gauge.

So adding more or less fuel isnt going to make the additive last longer......but driving more economically with the aim of using less fuel might help......but not alot.

[72dudes]

Thanks for the explanation kfk, that makes sense.

 

Another complex Citroen electronic system with the potential to go wrong!...

 

You gotta love 'em

[iannez]

you should try and get one through its emissions on mot test. they run so clean it a nightmare trying to get them to register on the machine.

[legin]

This might sound silly but when do you know that the additive is low? Also where does it go?

[Randombloke]

This might sound silly but when do you know that the additive is low? Also where does it go?

 

If the Eolys fluid gets low then you will get a message from the car. I think there is a small tank under the rear seat somewhere.

[legin]

O.K. thanks for the info.

[Guest Frenchman]

O.K. thanks for the info.

 

 

Did you manage to locate the eoly fluid tank, as I also need to refill the tank and can't find a ttrace of it in the manual.

 

Also where can you buy the eoly fluid, does it only come from the dealerships?

[kfk]

yes it only comes from a dealer.......and once you top it up you need to have the computer programmed to tell it you have topped it up......you will probably also need to replace the particle filter beacuse if the reservoir is empty the particle filter will be blocked.

 

Of course it maybe that its telling you the fluid is empty/low beacuse it has a computer or a level sensor fault.

[Guest Frenchman]

yes it only comes from a dealer.......and once you top it up you need to have the computer programmed to tell it you have topped it up......you will probably also need to replace the particle filter beacuse if the reservoir is empty the particle filter will be blocked.

 

Of course it maybe that its telling you the fluid is empty/low beacuse it has a computer or a level sensor fault.

 

Can you advise me on how to top up the tank. Had a look under the seat and their is a large plastic cover, underneath this their is a lot of electrical sensors , but no obvious way to put fluid into the tank.

Any help much appreciated.

 

Thanks

[Guest Chilie]

Can you advise me on how to top up the tank. Had a look under the seat and their is a large plastic cover, underneath this their is a lot of electrical sensors , but no obvious way to put fluid into the tank.

Any help much appreciated.

 

Thanks

Have a look at this link - it goes into quite some detail - see near the bottom of the page. http://www.honestjohn.co.uk/forum/post/index.htm?t=56250

[myglaren]

I'm geting a 403 from that link - do you have to subscribe to the site?

 

Tried a few other browsers and googling into it but no success their either. Thought it might be a Linux/Konqueror issue but Honest John are running Apache on a Mandriva Linux server so that is hardly likely.

 

Same story with Vista - looks as though the site has crashed.

[Guest Chilie]

I'm geting a 403 from that link - do you have to subscribe to the site?

 

Tried a few other browsers and googling into it but no success their either. Thought it might be a Linux/Konqueror issue but Honest John are running Apache on a Mandriva Linux server so that is hardly likely.

 

Same story with Vista - looks as though the site has crashed.

 

 

Link works ok for me so i will cut and paste the interesting bit for you courtesy of "Citroenslave", I havent tried it myself but its looking very tempting given the alternative bill. Im thinking if this was carried out regularly whilst the filter is still relatively unblocked it may last indefinately?

 

"Citroen 2.2 HDI Particle Filter. Cleaning the filter & replacing the additive.

Anti-Pollution Fault warning. Info here is for a 2.2 HDI Estate.

Thanks to all who wrote on above, especially Dieselnut. I had this fault up for 2 weeks (driving on limp home mode) while gathering info on how to solve it. Yes the filter can be cleaned & the fuel additive added. The usual safety rule with Citroens! Don’t go under them unless you have them safely on axel stands.

You can split the particle filter by opening the four 13mm hex nuts (spray with pen oil a few times and allow to soak for a while) around the middle of the filter. Think its best to use a six rather than 12 sided socket for these. Remove the exhaust clamp on the back end of the filter. The exhaust pipe is inserted into the filter approx 40mm. Remove the small pipe fitted into the side of the filter at the back 19 mm hex.

Once removed soak the filter for a few hours in water and pressure wash from both sides several times. It’s a slow job. Be careful if you are using an industrial high pressure washer, the high pressure can remove the glue from between the segments inside the filter. Think it might be best not to use detergent. Water from an ordinary garden hose should easily flow through the filter when finished. You can use compressed air to blow the water out the filter before refitting.

Refitting: Clean the gasket and the mating flanges & refit the filter. I would suggest running the engine at idle speed for a while to allow the filter to dry out.

Replacing the Additive: The additive tank is underneath the fuel tank on the left side. The filler facing to the rear. Press in firmly on the two white buttons on each side of the cap and pull the cap off. I could only get it form the Citroen dealer €50 (£34) per litre. If you have the RP # (you’ll find on the drivers side door frame near the hinges 4 digits & 2 letters it makes getting the correct additive easier.

Kits came with extra bottle & tubes & no instructions. I used an 18mm inside diameter clear plastic tube which fitted over the addative tank opening. I routed this up inside the wheel arch and fitted a large funnel into it. You can hang this tube & funnel off the door lock receiver. This worked perfectly with no venting problems. The clear hose allow you to see if you are overfilling. "

[Randombloke]

And no details on the necessary reset for the ECU?

[Guest Chilie]

And no details on the necessary reset for the ECU?

 

No - but something doesent stack up to me here regarding ECU reset - if theres a sensor to say that the eloys level is now at point where it needs to be topped up which there must be otherwise the warning would have to be set to a specific number of miles which it clearly isnt as people report anything between 40- 70 k before a warning. So then why also make it necessary to have the ECU reset i.e. 2 systems to control the same thing, is this ECU reset only necessary if the warning has been displayed, if so does topping up the eloys before the warning appears negate the need for the ecu reset? Call me cynical but it strikes me that the ECU reset thing is just to make sure you have to spend some cash with the Citroen dealers.

[kfk]

And my opinion on resetting the ECU......it seems to me that the longer the owner drives trying to avoid replacing the eolys/particle filter the greater the chance that the computer cant be reset and needs replacing, not to mention the posibility of sensor failure within the tank (corrosion of the sensor due to lack of fluid covering?)

[myglaren]

Link works ok for me so i will cut and paste the interesting bit for you courtesy of "Citroenslave", I havent tried it myself but its looking very tempting given the alternative bill. Im thinking if this was carried out regularly whilst the filter is still relatively unblocked it may last indefinately?

 

Thanks for the quote, the site appears to be working again now, must have been a temporary outage.

 

Interesting information there.

[Guest PaulM]

As far as I know early cars had a level sensor and no ECU reset is required.

 

Later cars use the computer to keep count of the fluid used and don't actually have a sensor in the tank, so the computer needs to be told the tank has been filled.

 

The fluid for early and later cars is different.

 

New cars use around 4 Litres to top up at 75000 to 80000 miles, full refill with the filter change at 120000 miles is 5 litres. Spare bottle is for draining the residue from the tank before refilling. GSF listed the fluid and filter a year ago but didn't have any then, but might by now (for 2.0 HDI new type engine)(price similar to Citroen dealer anyway).

 

Mine was topped up at 73000 miles this week (before the warning light came on), used 4 litres, around 1/2 hour labour at the main dealer, didn't seem worthwhile doing it myself as they weren't too dear., got 10% discount on the fluid which the parts man said was effectively cost price for them.

 

Paul

[legin]

Any idea on how long the fluid lasts before a refill is needed?

[kfk]

Depends what model and age.....what your RP NO?