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DPF Recycle

Discussion in 'New A3/S3 (8V Chassis)' started by StefRobinson, Oct 5, 2013.

  1. StefRobinson
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    StefRobinson Active Member

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    For those of you with a new diesel car, how often are you finding the DPF goes through it's recycle program? You may notice the fan going full whack when you stop, a very warm engine, the stop/stop disabled, the odd smell of hot fluids etc.

    I know this is a normal thing for the car to be doing, but how often should it be doing it? Does it depend on the weather, the number of miles driven, or how you drive and how much right foot you use etc?

    Also, do you notice any pattern to when the car does it? Driving in traffic, driving with very low revs taking it easy etc, or does it do it after so many hours of running?

    I've noticed mine has done it a couple of times recently. The first thing I notice is the start/stop suddenly stops working. Then when I get out, the fan is usually going hell for leather for a few minutes!

    The car has only done 550 miles. It has been driven very carefully so far, to try and get as much economy out of the car as possible. Maybe that's related?
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  2. monopole
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    monopole pro-monopole-ish-ism-istic

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    Def related, but not sure about 550 m from new, I dont know much about DPF (yet!) But surely it takes much much longer than that!?!?!?!?!?
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  3. Daveotto
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    Daveotto Well-Known Member

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    Have done around 1500 miles and only noticed it once, after about 350 miles.

    I tend not to do very much in the way of short time/ distance journeys with typical journey lengths around 10 -25 miles, but do a mixture of driving, anything from crawling around London rush hour traffic for 90 mins or more or 70mph+ on motorways/dual carriageways.

    I am sure I read somewhere, but not sure where, that the DPF can regenerate whilst you are driving so you may not even notice it but are more likely to notice it if you do a lot of short journeys when it us more likely to kick in once you have turned off the engine.
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  4. StefRobinson
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    StefRobinson Active Member

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    Most of the journeys I do are 17 miles. Basically the run to work and back. I've noticed it once or twice coming home from work, which is downhill or flat for a lot of the journey, therefore a lot of coasting and minimum acceleration involved.

    I've also noticed it on short journeys, around 7 or 8 miles, again where there was a lot of coasting involved. I've never noticed it yet going to work, where I have to accelerate up hills etc.

    Maybe with journeys using more acceleration, it clears itself, and the recycle doesn't need to kick in?
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  5. 97catalunya
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    97catalunya Member

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    I think you're right Stef, I don't have a TDI but on short journeys or tick over (coasting) is where the sooting up will occur the most. A good blast on the motorway where the exhaust will heat up will help to blast it out.

    I have had a diesel before that didn't have a DPF and after a lot of slow town driving if I gave it a blast I would leave a big black cloud behind me where the soot had been blasted out! #embarrassing lol
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  6. sftdi
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    sftdi Member

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    My previous car was an A1 1.6 TDI, which I owned for 2 years and I reckon it probably did a regen once every 7 days or so. It always seemed to be on my short journeys too which I found to be rather irritating. My commute of 11 miles was not enough for it to perform the regen and I reckon approx 16 miles driven quite hard would have cleared it. I did this a few times, just drove round booting it to clear the regen.
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  7. rdgc
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    rdgc New Member

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    I've recently got a new 2.0 diesel A3 and having issues with this, it's only done 300 miles over 5 days but i've had 3 regen's now after shutting the engine down with the fans loud and a burning smell, one after a 90mile motorway run as well... Dealer suggests this is possibly not "normal" so want to take it in for a few days, has anyone else seen that kind of behaviour ?
    Last edited: Oct 9, 2013
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  8. StefRobinson
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    StefRobinson Active Member

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    I've got a new 1.6 TDI S-Tronic and mine sometimes seems to go through phases, which I was wondering if it was down to driving style... It seems to do it more often when more coasting and driving with little throttle input is used on certain journeys. Apparently, this leads to more soot build up that needs to be cleared.

    I recently had 2 or 3 regen's in only a couple of weeks. I've done about 60 miles since the last one, and so far this week it's all been fine and it hasn't done it again, and start/stop has been working all the time. My car has done around 600 miles now.

    I guess different circumstances, styles of driving and varying degrees of careful driving and coasting etc. may cause it to happen more often for some.
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  9. alphaj12
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    alphaj12 New Member

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    I notice this relates to the newer models, what year did DPF's appear on these engines. Am I safe to assume that an 05/06 TDi will not have this feature?
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  10. Twizzler
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    Twizzler Member

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    This behaviour on the 8v cars is totally different to the 8p. My existing 170 is 6 years old and has only 22k on the clock, mainly local running. In this time I have never seen a warning light and have only noticed a regen 4 times. Just putting it into Sport mode and driving it at around 3000 rpm for a few miles was all that was ever needed.
    If the new models are regenerating at this rate then those that are would appear to be defective, unless they are all doing it, in which case a change of regen strategy must have been employed by Audi. If the latter then I suspect an upgrade will appear soon to correct this undesirable problem.
    I have a 184 on order for 1st March delivery. I hope Audi address this problem before mine is bolted together.
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  11. cuke2u
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    cuke2u Well-Known Member

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    DPF regens are dictated by driving conditions, ie short journeys, or driving styles. As my previous, no-maintenance, coated DPF, diesel performed a regen very often, considering the mileage I'd done, because I only did a few miles a day and sometimes the car was barely warmed up. I used to just take it for a longer run once a month just to be sure. Perhaps Audi are erring on the side of caution...
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  12. ivicyrusivi
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    ivicyrusivi Member

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    I have a 1.6tdi a1 and it probably regens once a week ish? It's not that it's kicking in when you stop, it's that it's cooling itself off after the regen.

    The way i understand it, coasting definitely doesn't help. It relies on the engine being above a certain amount of revs/strain for a certain amount of time, in order for it to activate - hence why city driving is bad for it. I think they say constant ~40mph for 10 mins or so

    I use the car on a longer journey (around 1hr motorway) once a week which does the trick, however i've had the dpf light come on when i didn't do any long trips for around a month

    Gives you a good excuse to go for a drive :D
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  13. Twizzler
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    Twizzler Member

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    As a further thought to all this, given the new models are more fuel efficient and also have considerably lower emissions than the 8p I would expect the dpf to be less stressed not more.
    Perhaps the latest dpf has a lower capacity.
    Last edited: Oct 10, 2013
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  14. cuke2u
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    cuke2u Well-Known Member

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    Maybe, just as a update, regens are generated by the temperature of the engine, the exhaust and how much soot is detected within the dpf. It then forces the engine to run hotter, thus the exhaust gases are hotter, to burn off excess soot..
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  15. Twizzler
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    Twizzler Member

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    On the 8p the principal determinant for the need for dpf regen is the amount of blockage of the dpf as determined by the sensors and electronics.
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