Treading the old DPF waters… sorry!

[FinGerS o FuDgE]

Taken from another thread:

There are two types of ‘regeneration’, passive and active.

During long motorway journeys, passive regeneration will occur. This needs no intervention from the engine control unit. Due to the raised exhaust temperatures on a long journey (temperatures between 350 and 500°C), the procedure occurs slowly and continuously across the catalytic-coated (with platinum) DPF. The catalytic-coated DPF is situated close to the Engine, therefore the exhaust gas temperature is high enough (500°C) to ignite the soot particles. Due to this soot is burned-off and is converted into a smaller amount of ash.

Well mine didn't do that last night? Had a 20-25 minute drive, all A roads with the revs @ a constant 2200 in both 3rd & 4th like I did before. The DPF % levels either stayed the same or gradually increased?

Active ‘regeneration’ is when the ECU intervenes when the soot loading in the DPF is calculated to be 45%. The procedure lasts for about 5 – 10 minutes. Specific measures are taken by the ECU to raise the engine exhaust temperature to above 600°C, these include switching off the exhaust gas recirculation and increasing the fuel injection period to include a small injection after the main injection. The soot particles are oxidised at this temperature.

When I first connected Vagcom on Monday night, a forced or 'Active' regen kicked in whilst I was @ 34%, so that's lower than what this is saying?

The ECU will trigger a regeneration process, if for some reason this is aborted, ie. customer slows down, stops etc, the process will be resumed when regeneration conditions are once again met, above 60km/h (38mph). This will continue for 15 minutes.

If after 2 attempts of 15 minutes, a successful regeneration has not been possible, the loading will increase. At 50% soot loading, the ECU will continue to maintain maximum exhaust temperatures of 600°C to 650°C to cause a regeneration process. The system will try to run a regeneration process for 15 minutes. If unsuccessful, the system will repeat this process for a further 15 minutes, if still unsuccessful, the DPF light on the driver display panel will then be lit.

I'm just going to keep taking out the laptop over the next day or two to see exactly when a 'Passive' regen will kick in or if not, when the 'Active' regen occurs again.

 

[/dev/null]

When I first connected Vagcom on Monday night, a forced or 'Active' regen kicked in whilst I was @ 34%, so that's lower than what this is saying?

Same here, I had one kick in a 24% - I don't think that other thread is telling the whole truth lol!

 

[Daveb77]

Had a go of the forced regen process today. I failed however!!!
I checked soot levels, at 34%, so attempted the forced re-gen, controller would not accept the security code though...? pi%h! Must be my 704 cheapo Vag Com cable pieces of eight software etc. Get what you pay for I suppose!

I did have a drive to shops though, whilst tracking soot levels and the regen status. With the short stop start journey to local Sainsbury’s I found that the soot levels to (alarmingly) rise in levels (temps around 300degC) and as soon as it got to 45%, bingo, bits changed to ...0001, normal regen kicked in, car short on power and went a bit lumpy on the throttle as normal with regen etc! Had a short go on M8 at 2000+rpm, and within five mins, soot down to less than 10% (temps circa 600degC), the point at which normal regen switched off (...0000) and car was back to normal, smooth!

Would have been tops if i could have forced the issue (excuse the pun had a couple of beers) but at least it looks like my DPF / regen process is working as it should.
Any ideas with the 704 Vag Com being the problem with security code or will i have to stick with monitoring only! I switched my locking chirp back on though, always nice!

Im sure i saw a link to the latest 904??? cable somewhere, reckon its worth getting?

Cheers

D

 

[AndrewJB]

704.1 IIRC is a KKL Cable not a Can Bus one ?

 

[ash101]

Had a go of the forced regen process today. I failed however!!!
I checked soot levels, at 34%, so attempted the forced re-gen, controller would not accept the security code though...? pi%h! Must be my 704 cheapo Vag Com cable pieces of eight software etc. Get what you pay for I suppose!

I did have a drive to shops though, whilst tracking soot levels and the regen status. With the short stop start journey to local Sainsbury’s I found that the soot levels to (alarmingly) rise in levels (temps around 300degC) and as soon as it got to 45%, bingo, bits changed to ...0001, normal regen kicked in, car short on power and went a bit lumpy on the throttle as normal with regen etc! Had a short go on M8 at 2000+rpm, and within five mins, soot down to less than 10% (temps circa 600degC), the point at which normal regen switched off (...0000) and car was back to normal, smooth!

Would have been tops if i could have forced the issue (excuse the pun had a couple of beers) but at least it looks like my DPF / regen process is working as it should.
Any ideas with the 704 Vag Com being the problem with security code or will i have to stick with monitoring only! I switched my locking chirp back on though, always nice!

Im sure i saw a link to the latest 904??? cable somewhere, reckon its worth getting?

Cheers

D

D B just pm d you a possible soloution!!

 

[Daveb77]

D B just pm d you a possible soloution!!

just seen that boss, appreciate the time, ill feedback as and when.

cheers

D

 

[ash101]

D B I just seen Andrewjb Post perhaps its no good with older cable.
This looks a good deal !!


http://www.dhgate.com/wholesale/76834137.html

 

[McDubber1]

I'm a bit unsure of this dpf regen thing. I know what the dpf is and what it does but i don't think my car has ever went into regen mode.

Is it just a loss of power and the car being quite juddery or is there other signs aswell?

I've had the car for around 3 months now with no signs of the dpf light. The only juddering i seem to get is when first starting the car from cold but that disapears within a few seconds but i've just put this down to a typical diesel thing.

If someone could kindly advise me on what to look out for that would be brilliant.

Cheers

 

[/dev/null]

^^ If you don't have a problem, don't try to fix it!

 

[McDubber1]

No i'm not trying to fix it i just want to know that if/when it goes into regen mode will i know that it is regen mode and what the signs are?

 

[FinGerS o FuDgE]

I think the main tell tale signs are an increase in revs. Usually about 850 revs but will go up to around 1000rpms. It will sound a fair bit louder and rougher, 1st and 2nd gear may feel sluggish and have a lack of power. You may also notice a strange smell.
Took me ages to realise when it was occurring.

 

[AndrewJB]

i noticed it would feel like it was in limp mode and then all of a sudden all of the power is back there, When going round a roundabout it can catch you out

Also when you pull up the revs will stick at about 1000rpm

 

[/dev/null]

^^ First stage regen is at 850 revs.

 

[FinGerS o FuDgE]

^^ First stage regen is at 850 revs.

I thought the revs increased when it started regen?

 

[Compo1]

^^ First stage regen is at 850 revs.

So what is the regular tickover speed then mate ? Mine seems to be around 800. Ive never seen a tickover of 1000rpm though.

 

[/dev/null]

Sorry, I meant it is at regular tickover speed which is around 800 - 850. If you go into 2nd stage regen then it will tick over at around 1k.

 

[Nath.]

Just checked my soot level and It was at 14% so no need for me to worry yet, even though the Leon only gets used for very short trips (2 miles twice a day and maybe a run every other weekent)

I have Vag-Com 704.1 and this is what I did.

Connect laptop to the car and open Vag-Com
click on select control module
click on 1 engine
click on 8 measuring blocks

On mine it seems that you can measure 3 blocks at once so I just used the top one of the 3 and scrolled the display up to no75

with my engine off and cold from being left for a few days my info in "lambda %" was 14

I will charge up my laptop and go for a motorway run later and see if it comes down

 

[Nath.]

So after a 30mile motorway run at 65-70MPH all the way this afternoon my 14% DPF soot reading changed a bit.

Anyone want to guess what it is now?

 

[GainfulShrimp]

15%?

 

[FinGerS o FuDgE]

I bet it did go up lol. Going for 15.6%

Mine has slowly increased even though I've driven as you are meant too. It must just clear itself down to low % levels and then not go into a regen again until it hits a certain percentage - ie. Around 25%?