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VCDS DPF Soot Level

Discussion in 'A3/S3/Sportback (8P Chassis)' started by DaveA3-TDI, May 23, 2012.

  1. DaveA3-TDI

    DaveA3-TDI Member

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    I had my car checked with VCDS the other day as I was trying to find out what the soot level in my dpf was so I went into engine and then measuring blocks 08 and looked at channels 070 & 075 and it told me the lambda was at 21.6% , does this sound about right? From what I can find out on here and other sites sometimes it says lambda instead of soot load but means the same thing?

    Is this the correct way to check the level?

    Oh car is 2.0 Tdi 170

    Thanks
     
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  3. Rhyso

    Rhyso Well-Known Member
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    Yes you are correct

    If you can, take it for a drive and get the pre-turbo temperature up past 750c and you may see a regen start to take place and the soot % falling :)
     
  4. DaveA3-TDI

    DaveA3-TDI Member

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    Thanks, I have read that the dpf light can come on when it hits 45%. As mine is reading 21.6% is that good or bad, what is an average reading?
    i only started looking into all this as the over day when I got home the car was ticking over at around 1,000 rpm instead of the usual 800rpm. I sat there for a couple of minutes and then it went back down to 800rpm, any idea what was happening?
     
  5. Rhyso

    Rhyso Well-Known Member
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    Its about average; mine reaches 30% sometimes and then i give it a good hammering!!

    Passive regen by the sounds of it ;)
     
  6. DaveA3-TDI

    DaveA3-TDI Member

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    How often or how does the car decide when to do a passive regen?
     
  7. a6_chris

    a6_chris Well-Known Member

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    Every 100 miles or so
     
  8. DaveA3-TDI

    DaveA3-TDI Member

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    Why does it do it so often?
     
  9. max69vk

    max69vk Active Member

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    Depends in your driving style, in reality every 300 miles is probably a more realistic regen cycle.
     
  10. a6_chris

    a6_chris Well-Known Member

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    Oops - I thought it was every 100.

    My DPF light has come on too many times on my A3 - I do 600 miles per week all motorway so it shouldn't be coming on but this is down to the long 5th gear in the E so a blast in 4th sorts it out.
     
  11. max69vk

    max69vk Active Member

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    I've had mine come on 5 times in 350 miles, mind you I've just found out the turbo is faffed!
     
  12. Gogsie

    Gogsie Member

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    Just get the thing ripped out!. I have done this on my A4 and it's the best thing I ever did!
     
  13. DaveA3-TDI

    DaveA3-TDI Member

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    I probably do 100 miles a day on country roads so I am hoping that I won't get any problems with the DPF, isn't the DPF required for an MOT?
     
  14. Rhyso

    Rhyso Well-Known Member
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    No its not - here's a reply i had from VOSA direct;


    From an MOT perspective a compression ignition (diesel) engine must meet
    the specific emission limits as prescribed in the Private Passenger and
    Light Commercial Vehicle Inspection Manual (IM). Particulate filters are
    not part of the MOT. However, particulate filters are, as their name
    implies, fitted to filter out particulates (soot) in the exhaust gases and
    as a method to meet current emission requirements. It is possible that
    removing the particulate filter may affect engine performance and it's
    ability to meet the relevant emission requirements.

    However any body removing an emissions component should consider that the
    vehicle may have been type approved to certain level which includes the DPF
    and that it's removal could contravene.
     
  15. DaveA3-TDI

    DaveA3-TDI Member

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    I am thinking of having the DPF removed now and how found a company local to me in Stroud called Turner Race Developments, has anyone used these guys?
     
  16. DaveA3-TDI

    DaveA3-TDI Member

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    I am having issues with my car at the moment!! When driving around town on light throttle keeping up with the traffic engine revs between 1800-2000 rpm sometimes the car will hesitate, bit like a mis-fire, power dips and back on again. I have also noticed that sometimes if I stop, the engine idle speed increases to around 1,000rpm and then will drop back down to around 800rpm after a couple of minutes.

    The car is a 2.0 litre TDi 170 and has started doing this more and more. If I keep driving though after 10 mins of putting up with the hesitation etc the car will then suddenly run fine and be ok till it does it again. When it has it's moment of hesitation it is fine if I am hard on the throttle or at speed.
    I am wondering if I could have a problem with the DPF although I have never had a light come on or could these be symptoms of a failing EGR valve?
    Can anyone help with suggestions or ways I could check? I am still thinking about having the DPF removed by Turner Race Developments, is this a good idea or can anyone recommend this company?

    Thanks in advance
     
  17. a6_chris

    a6_chris Well-Known Member

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    Your first paragraph is describing a regen as far as my knowledge reaches ;)
     
  18. DaveA3-TDI

    DaveA3-TDI Member

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    I did think it sounds like a regen but I never had the DPF light come on and it seems to be doing it almost every journey I make now! I travel about 60-70 miles a day which can include fast roads and built up area driving.

    I am not sure whether to go down the DPF removal root of EGR replacement route?

     
  19. max69vk

    max69vk Active Member

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    Your car is going into 'Passive regen' to burn off the soot, nothing to worry about it's normal. This happens when soot levels hit 40%

    If you dont clear it out or the regen fails (doesn't complete) it will then flash a warning on the dash & go into 'Active regen', this occurs at 60% soot levels.

    If even after taking the car for a good long booting the light still doesnt go out, or soot levels drop (below 75%), you will need to get the car into a garage or use VCDS to do a 'Forced regen' to try & clear it.

    If Soot levels raise above 85% you can pretty much consider the DPF as fubar!
     
  20. DaveA3-TDI

    DaveA3-TDI Member

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    I don't understand why it keeps doing it almost every day at the moment? Shall I just get the dam thing removed?
     
  21. RYes3

    RYes3 Active Member
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  23. max69vk

    max69vk Active Member

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    It may not be fully completing its regen cycle, so it stops the process till it then thinks its has a chance to fully regen, then realises that the levels are rising again & tries to do the regen yet again, its all reasonably normal though. I had one passive regen process 'fail' 6 times because I didnt drive it enough when it was attempting to regen, but the next time I drove it it sorted itself out out. The DPF can be a bit fickle at times!
     
  24. DaveA3-TDI

    DaveA3-TDI Member

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    Is there anyway with VCDS to see if the regen has failed?
     
  25. a6_chris

    a6_chris Well-Known Member

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    Not sure but you can check the soot level in Measuring Block 075 (or there abouts) in the Engine module.
     
  26. DaveA3-TDI

    DaveA3-TDI Member

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    I will check later and see what is going on, would it be worth forcing a regen?
     
  27. a6_chris

    a6_chris Well-Known Member

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    Depends on the level - go for a 25 minute drive in 3rd first (around 2500 rpm) though to clear it out a bit first before forced regen.
     
  28. DaveA3-TDI

    DaveA3-TDI Member

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    Ok, would it then be ok to follow these instructions from the ross-tech website? The section for the PD engine?
     
  29. a6_chris

    a6_chris Well-Known Member

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    Yep the instructions on rosstech is what you need.

    But forced regen is only really needed if the light doesn't go out.
     
  30. DaveA3-TDI

    DaveA3-TDI Member

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    I see, the light has never appeared on my car?
     
  31. a6_chris

    a6_chris Well-Known Member

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    No need to force regen then ;)

    Infact you only need to panic when the dpf and engine light appears.
     
  32. DaveA3-TDI

    DaveA3-TDI Member

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    I guess the only way forward then to stop the car feeling like a bag of **** when it decides to do it's regen is get the DPF removed. Any advice welcome regarding this? At least it doesn't sound like the EGR valve.

    thanks
     
  33. DaveA3-TDI

    DaveA3-TDI Member

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    Just been out and checked the car and the DPF soot level was at 34% and that was after 24km since it's last regen!! I forced a regen on the DPF following the Ross-tech instructions and drove it around for 25 mins and managed to get the level back down to 11.9%. I then drove normally and watched as the DPF level kept rising, have stopped now and the DPF level is at 15.9%

    What I noticed whilst it was doing it's forced regen was the car started driving horribly as I described previously but once it had finished and was down to the 11.9% it was sweet drive.!!
     
  34. Cossie_boy

    Cossie_boy Member

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    Dave, this is exactly what mine seems to be doing, is yours ok now?

    As you say, if revs are at 1000 rpm it runs bad and annoyingly hesitates making a horrible drive, then once sorted and back to 800 rpm its like a dream!

    I also have an added intermitent hesitation over 3k in 4/5/6th gears, but more convinced the low revs is the poxy DPF

    Does everyones car do this **** driving whilst DPF does its thing or do we have faults?!

    My light has only ever come on once, today!
     
  35. Dannykn9

    Dannykn9 "Cruise My Ride"
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    Totally normal mate, nothing to panic about.
    The only fault really is the design of these stupid DPF's!!
     
  36. Cossie_boy

    Cossie_boy Member

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    Madness Danny, lol, I cant help feel mine does this a little too often though, to work is about 15 minute drive at 70 ish when I can and is up to temp before I get to office, hoped this was ok?

    Wasnt there a thing where after injector and loom recall they done an ecu update to make the dpf regenerate more?

    Mine is going back to place i got it tomorrow then to audi to be put back to standard on ecu so not sure how thats gonna affect anything, plus they need to check the dpf at same time as noticed some black soot around bulkhead!
     
  37. DaveA3-TDI

    DaveA3-TDI Member

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    I got so fed up with it and after speaking to a few people just got the DPF internals removed. Best thing I did, car is much better to drive without it.
     
  38. Cossie_boy

    Cossie_boy Member

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    hmmm, its crossed my mind, need them to get it all smoothed out first!
     

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