Hi all, when driving I have noticed when coming to a halt my car initially drops to 900rpm then after about 4-5 seconds it drops to 800rpm to tick over, this morning when I got to work I stopped and noticed that the engine was ticking over at 1000rpm, I got out whilst the engine was running and notice a warm smell, I then parked up and the engine was still ticking over at 1000rpm. I got into my car to come home and for the first 7-8 minutes when I stopped at junctions and roundabouts it was at 1000 rpm but then it dropped back to its normal procedure.

I looked in the manual and there was no reference to this so looked on the internet and found that it was probably doing an active DPF regen, which when getting to work I had inadvertently interrupted, On going home the car finished its regen and returned to normal, Does this sound about right and how often will I expect this to happen, I do have a short 10mile journey to work but there is some stopping and accelerating and about 60% of it is a over 60mph, but got to admit I have been driving more carefully due to mpg so not been gunning it like I maybe should occasionally.

Like some have also said that there is no warning light when its doing this so If It is an Active regen then I have to agree with others on the net that there should be some sort of info to tell you whats going on as to not cause confusion,

Cheers,

Edited 10 September, 201213 yr by bryanp

Just looking on net again and found this on the AA site,

"Active regeneration

When the soot loading in the filter reaches a set limit (about 45%) the ECU can make small adjustments to the fuel injection timing to increase the exhaust temperature and initiate regeneration. If the journey is a bit stop/start the regeneration may not complete and the warning light will come on to show that the filter is partially blocked.

It should be possible to start a complete regeneration and clear the warning light by driving for 10 minutes or so at speeds greater than 40mph."

So it looks like it was doing what I thought, also no warning light unless it doesn't complete a full regen and then the light comes on to tell you that a complete regen is need which I presume is the driving at 2500rpm in 4th/5th gear for around 10-15mins

Edited 10 September, 201213 yr by bryanp

Sounds like it. I've noticed it a couple of times with the Yeti after a short motorway trip - fans stay on for several minutes and there's a lot of heat around the exhaust. I'm presuming I've done the same as you and interrupted the regen. The oil temp seems to go up as well (105 or so). This is just pootling along at 60 or so to keep the mpg up - the Yeti isn't anything like as slippery as the Superb.

Sounds like it. I've noticed it a couple of times with the Yeti after a short motorway trip - fans stay on for several minutes and there's a lot of heat around the exhaust. I'm presuming I've done the same as you and interrupted the regen. The oil temp seems to go up as well (105 or so). This is just pootling along at 60 or so to keep the mpg up - the Yeti isn't anything like as slippery as the Superb.

How do you check your oil temp?

How do you check your oil temp?

You can't on the Superb, sadly.

You can't on the Superb, sadly.

yes, you can. in maxidot

yes, you can. in maxidot

Yes you can +1

The visibility of oil temp on the maxidot has been discussed on the Yeti forum a few times. Some folk only saw the option to display it only if the service interval was set to variable (done by the dealer or VCDS), but others saw it on fixed. It was on mine from the start, fortunately. With the long warm up time for the CR170 engine (around 6 miles on my usual trips) it's helpful to know when you can start to play with the power

bryanp, if you've got a common rail diesel then this might help....http://www.skoda.co.uk/GBR/Documents/19246_Skoda_DPF_Leaflet_v7.pdf

Almost certainly a DPF regen. You'll notice the idle rises to just under 1000rpm, the oil temperature will rise a little, the throttle can be lumpy under part load and the exhaust sounds more 'boomy' at around 2500 rpm.

If you interrupt the DPF regen you might also notice the coolant fans running their nuts off even with the ignition switched off, this is to dissipate the heat generated during regen.

Personally I think the DPF light should be in three colours - green: DPF regen in progress, yellow: DPF regen problem, red: DPF FUBAR