I can tell you now from watching a DPF regen that start/stop working does not mean it's finished.

 

It appears to continue a long time after that, I always turn my start stop off when it does one.

12 minutes ago, micro said:

I can tell you now from watching a DPF regen that start/stop working does not mean it's finished.

 

It appears to continue a long time after that, I always turn my start stop off when it does one.

But would the start stop not disrupt the process if it needs to sit at 1000rpm to complete it? 

It does interrupt it, and it sounds like your car has been interrupting it. 

 

If it does it regularly then a regen probably takes far less time than if it's had multiple interruptions.

 

I would suggest from the moment you notice your car trying to regen that you turn start stop off, and ensure you drive for at least 20-30 mins. Driving is not sat in traffic, and the process may be slower when doing so.

 

If you have someone nearby with the tools to view the data you can check if you're nearing the threshold for it complaining.

Edited 2 October, 20232 yr by micro

Just now, micro said:

It does interrupt it, and it sounds like your car has been interrupting it. 

 

If it does it regularly then a regen probably takes far less time than if it's had multiple interruptions.

 

I would suggest from the moment you notice your car trying to regen that you turn start stop off, and ensure you drive for at least 20-30 mins. Driving is not sat in traffic, and the process may be slower when doing so.

Ok cheers. 

1 hour ago, micro said:

It does interrupt it, and it sounds like your car has been interrupting it. 

 

If it does it regularly then a regen probably takes far less time than if it's had multiple interruptions.

 

I would suggest from the moment you notice your car trying to regen that you turn start stop off, and ensure you drive for at least 20-30 mins. Driving is not sat in traffic, and the process may be slower when doing so.

 

If you have someone nearby with the tools to view the data you can check if you're nearing the threshold for it complaining.

You need to find out why s/s is working when it's doing a regen. That's not right.

23 hours ago, Dean17 said:

Just to update anyone who’s curious. I took my car to my local Skoda specialist who put it on the Vcsd and it said coolant pump c stuck. He said because it was an intermittent fault it wasn’t allowing the regen to complete so he wiped the fault off and put it into a forced regen as there was 23g of soot in the dpf and apparently if they go over 80 they can’t be regenerated after that. Seemed ok for the next week until I had coolant pump c replaced on Friday. 

However, it still seems to be going in to active regen too much to me. This morning about 9am the stop/start had stopped working, the engine had set itself to 1000 rpm and the fans came on. 10/20 minutes or so of this then the start/stop worked again. So I thought it’d finished, great that was a normal regen. But after working all day and sitting in bumper to bumper traffic and only doing about 50 miles it started doing it again at about 7pm. Only this time after 10/20 minutes of 1000rpm while idling it kept going to start/stop as if it had finished, then I would start the engine again and move up in the queue and it’d go back up to 1000rpm and say the start/stop was disabled again. I just don’t understand why it’s doing it so much. Long shot I know but had anybody else had this? 

Fyi.

 

80 grams is reputably the maximum "ash" "unburnt bit" that the dpf will hold before replacement is required. This is What vcds reports on screen. 

 

What I believe your specialist mentioned, 23g is roughly the trigger at which the car enable a regen. I know this as I have witnessed this trigger point with my own VCDS software. After a regen the values drop to around 13g and then gradually rise again with driving. 

Edited 3 October, 20232 yr by paulski

I wonder if running the car for long periods of time each day will affect the frequency of the regeneration process. I’m out driving it on and off for 8-10 hours most days, not doing massive mileage though. 

@Dean17How many miles does it go then from each cold start until stopped again and at what speed in each stint? 

 

Everything has an affect, sitting idling very much so. 

Just now, toot said:

@Dean17How many miles does it go then from each cold start until stopped again and at what speed in each stint? 

 

Everything has an affect, sitting idling very much so. 

I drive it 4 miles to my sons school on a morning and then take him. Start the engine again and from there I usually drive about 15 miles to the petrol station and then after that various times sat idling and driving various distances for the rest of the day as I’m a taxi driver. Was normal all day today but about 4/5 o’clock I was sat in heavy traffic for quite some time and then it started. Seems to take about half an hour sitting at 1000rpm and then after the half hour was back to normal. Did it twice yesterday. Once in the morning after I’d taken my son to school and then again in the evening but the traffic was terrible all day yesterday so I was sat in stop start traffic most of the time. 

That is exactly the worst of use for 1.6 TDI CR.s.    so many used as taxis and is the fuel economy actually worth it when the costs are taken into consideration?  Usually not.  

Edited 3 October, 20232 yr by toot

Sounds like a diesel isn't the right choice. 

It may have nothing to do with the DPF. The car may have a weak battery and therefore need to recharge more frequently. hence the start stop system warnings. There is something about this in the handbook somewhere.