Engine: D5: Soot Filter driving me crazy...HELP !

[RoyMacDonald]

I haven't been able to find a clear picture of the 2003 EGR Valve but here are photos of a Volvo 2002 1.9 diesel EGR valve complete with carbon.

[961]

Originally Posted by 111

Sorry if this has been covered somewhere but there was to many posts to read, I know that people with Vectra CDTi estates and Singums are getting the regen and PDF written out of the ECU software as well as removing the CAT without any problems & thus getting rid of the overfueling and smoke issues & obviously the dealer visits,
http://www.vectra-c.com/forum/showth...iculate+filter
Hope this helps someone

Did I not read proposal that the MOT should fail a car without a CAT regardless of emission quality?

[RoyMacDonald]

Originally Posted by 961

Did I not read proposal that the MOT should fail a car without a CAT regardless of emission quality?

How can they tell if the DPF has a filter in it or not? It still passes the emissions test without it.

Don't remove the EGR though as the engine is designed to have recycled exhaust gases in the fuel air injection mix and it will cause problems if they are not there.

[RoyMacDonald]

Originally Posted by Bill_56

Sometimes, if I'm not commuting for a few days and just loping around town instead, it will repeatedly fail to regenerate and then I get annoyed, and take it for a more agressive (read 'fun') drive on the faster A-roads to make doubly sure it succeeds. But I personally think any benefits of needlessly thrashing the car, in the hope of avoiding or overcoming DPF problems, are definitely misguided.

Try this Volo specialist Bill.....http://www.race-tune.com/dpfdelete.php

They are over your way.

Roy

[Bill_56]

Folks,

I'd steer clear of any DPF removal schemes.

So far as I recall (can't be bothered checking), a vehicle must continue to operate within the emissions regulations that prevailed when the vehicle was manufactured, and it must meet the emissions regulations for which it was approved at manufacture.

That means that, whilst a Euro III car may be allowed a certain amount of particulate matter in its exhaust and relatively low levels of CO2, a Euro IV car that rolled off the production line a week later, would be expected to be produce more CO2 but less carbon. I accept that the current MOT test may fail to detect such discrepancies, but if you are a law-abiding citizen then what matters is legality rather than whether or not it fails the MOT. And in any case, as those who have fitted illegal HIDs may soon find out, the MOT may be enhanced at some future time mop up such loopholes.

As for XC90s, it is indeed mildly interesting that the XC90 areas of the Volvo forums seem relatively clear of DPF problems. But try googling for terms like XC90 soot filter full and it becomes clear that XC90 DPF problems are quite widespread, they're just not reported on these forums.

Who knows, maybe the XC90 guys (& school Mums) have agreed a pact to keep quiet about DPFs so as to preserve second hand values!? Only joking of course but then again... why the heck didn't we (on our bits of the forum) think of that?

[RoyMacDonald]

Originally Posted by Bill_56

As for XC90s, it is indeed mildly interesting that the XC90 areas of the Volvo forums seem relatively clear of DPF problems. But try googling for terms like XC90 soot filter full and it becomes clear that XC90 DPF problems are quite widespread, they're just not reported on these forums.

Race Tune are a reputable company with a long history of working on Volvo's and DPF removal can be reversed if it ever becomes a legal issue.

I tried Googling the term you suggested Bill, but I got fed up after looking at two pages of links without finding anything relevant. This was the closest I got but it was a warrenty issue and fixed accordingly. http://www.volvoxc.com/forums/showthread.php?p=113748

You are misleading people with the statement that XC90 DPF issues are widespread. They are not!

[Jim314]

Originally Posted by RoyMacDonald

I should correct a mistake I made in an earlier post where I said the EGR gases contained air. They don't.

Are you talking about petrol engines, diesels or both? Could it be that the article you linked to is about petrol engines?

The reason I wonder is that I understand that diesels often run lean (i.e. excess air relative to fuel) and so there should be a lot of unreacted oxygen gas in the exhaust of a diesel. Clearly some of the oxygen reacts with nitrogen to form NOx, but I think a lot of molecular oxygen (O2) survives into the catalytic converter and is used there to oxidize unburned hydrocarbons and carbon monoxide to carbon dioxide. And a lot of oxygen survives into the DPF where it oxidizes the soot to carbon dioxide.

I am under the impression that the main purpose of EGR is to reduce the temperature inside the cylinder during combustion in the power stroke, and reduces the oxidation of nitrogen gas (N2) to NOx. I don't have expert knowledge--this is just from casual reading.

See http://en.wikipedia.org/wiki/Exhaust_gas_recirculation.

[RoyMacDonald]

The inert exhuast gas being recirculated replaces some of the air/diesel mix and slows and cools the combustion process to reduce NOX. I would guess that is why it is shut off during the active regeneration to allow hotter exhaust gases with more oxygen and fuel to burn off the carbon deposits.

My point really is that the EGR system is not there because the car has a DPF fitted. EGR's have been fitted since the 70's, long before DPF's came on the scene. I assume NOX levels must rise during active regeneration.

Bill seems to be blaming his DPF for his EGR problem but it's most likely to be a carbonation issue with the butterfly flap being clogged up. XC90's with DPF's seem to have very little issues with the EGR system clogging up as far as I can see. The non DPF XC90's like mine have far more of a issue with carbon in the EGR system.

[Bill_56]

Originally Posted by RoyMacDonald

Bill seems to be blaming his DPF for his EGR problem

Roy, I keep trying to explain... my fault was the Electronic Throttle Body, not the EGR. It's a separate part.

And when I google for XC90 soot filter full I the following hits on the first couple of pages...

http://www.justanswer.com/uk-car/2ww...dashboard.html
http://volvoforum.pl/topics17/xc90-d...cy-vt28472.htm (translation welcome)
http://www.munsterfans.com/forum/for....asp?TID=24256
http://www.volvoxc.com/forums/archiv...p/t-16198.html

Closer to home, see
http://www.volvoforums.org.uk/showthread.php?t=28398

I can't be bothered doing looking for more as I've other things to do.

I've already commented wisdom of tinkering with emissions equipment. I've revisited what I said, and can't think of any way to clarify it so I just have to hope the majority of people understood, I'll not repeat it.

Hope this helps,

Bill

[RoyMacDonald]

Two of those threads are DPf discussions and one is the warranty claim I mentioned. I'm not saying the DPF never goes wrong just that it is not an issue that affects many XC90's in the way the pre DPF EGR carbon clogging is for those cars without a DPF.

Sorry Bill but the Electronic Throttle Body is part of the EGR system. It's certainly not part of the fuel injection system.