DPF Regen Frequency / Issues / Force discussion.

Yellow warning light for particulate filter came on today on my 14 plate kombi with 180 hp engine. I ran it on motorway for nearly 30 miles and it is still on. Any advice please.
 
Did you have plenty of fuel in it when you drove it on the motorway, and were you able to maintain a reasonably steady speed ?
What sort of rpm were you driving at ?

Pete
 
Thanks, yes plenty fuel and kept her about 2500 revs steady for most of 30 miles. Should have fixed it by then.
 
As stated previously, the 204HP works, but gives different values when selecting between CXFA and CXHA(1) and CHXA(2). Which is most correct for the CXEB engine?
 
kave said:
As stated previously, the 204HP works, but gives different values when selecting between CXFA and CXHA(1) and CHXA(2). Which is most correct for the CXEB engine?
Click to expand...
Referring to VAG DPF app? Last time I used Group 15 - CXHA(2) as it seems to be a bit more relevant than the other two. The other groups show some parameters not meaningful in T6 engines.

Neat, unexpensive app if need to know if the active regeneration is going on. Seems to work reliably with Carista dongle. Even records the values in a log file (the paid version).
 
Yes, sorry, forgot to mention the app.
They all give various values of how much % is left to renegerate. Mine stopped reneg at about 35% today.
 
kave said:
Yes, sorry, forgot to mention the app.
They all give various values of how much % is left to renegerate. Mine stopped reneg at about 35% today.
Click to expand...
Agreed that the percentage value doesn't work very well. It seems to be just a somehow calculated value from calculated soot mass and regeneration trigger level.

Typically value "soot mass calculated" "travels" between approx. 6 grams and 25 grams. So after a full regen the value is slightly less than 6 grams. And a regeneration is triggered no later than level of 25 grams has been reached. So I'd like to propose to keep eye on value of "soot mass calculated"

For T6 spesific values have a look at ---> Multiple Engine Management Faults

and for more complete description of DPF regeneration chemistry/physics have a look at pages 59-64 at ---> VAG SSP 514 – The New EA288 Diesel Engine Family
 
A while ago i posted about a vibration noise that can be heard when driving at between 1200-1400 RPM.
This morning I've come to the conclusion that its the DPF that's causing this, my reason for this is this morning my van was doing a regen while on the way to work, i know this because i could smell what i would describe as a soot smell and the idle revs were slightly higher than usual.

Anyway, whilst the regen was happening the vibration noise was completely gone and the overall drive felt much smoother. Once the regen had finished (the soot smell was gone and revs were back to normal) the noise had disappeared completely, the drive was better too. I've also noticed when I've done a decent journey on the motorway the noise also disappears but then comes back eventually.

I noticed after about 5 minutes of driving after the regen had finished the vibration noise was slowly coming back.

Any ideas? No DPF warning light on the dash, never had one come up either.

TIA!
 
I doubt it's the DPF vibrating, it's a secure part of the exhaust system.

More than likely a factor of the higher revs vibration.

Either way. You should be able to take it to VW, halfords AC, Kwikfit etc that has a vertical like ext and get underneath to
 
peterposh said:
DMF surely?
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Nope been checked, its fine, the vibration is also coming from exactly where the DPF is and its a bit of a coincidence that the vibration noise is gone when a regen is happening... It's annoying the crap out of me now, no one can find the issue, every mechanic thats looked has said definitely not DMF and sounds like its coming from the airfilter housing but unable to find where, not far below that is the DPF. When i first got the van i had to have the flexi on the exhaust replaced as it was making a noise. That solved that issue but not the vibration
 
This could be to do with the fit of the exhaust system (cat through to last silencer hanger) and heat. During the regen the DPF is getting up to some serious temperatures so that the trapped soot and be converted into ash so a noticeable amount of expansion happens to the exhaust system. Once the regen has completed the exhaust system will then slowly cool down to the normal running temperature (perhaps why this vibration comes back five minutes later). It's interesting that the flex pipe has already been replaced as that is often a sign that something in the exhaust system is out of alignment or is moving excessively in a twisting/rotational sense.
 
Mooncat said:
This could be to do with the fit of the exhaust system (cat through to last silencer hanger) and heat. During the regen the DPF is getting up to some serious temperatures so that the trapped soot and be converted into ash so a noticeable amount of expansion happens to the exhaust system. Once the regen has completed the exhaust system will then slowly cool down to the normal running temperature (perhaps why this vibration comes back five minutes later). It's interesting that the flex pipe has already been replaced as that is often a sign that something in the exhaust system is out of alignment or is moving excessively in a twisting/rotational sense.
Click to expand...

thank you very much for that reply, that does make sense, I’ll have a good look at all the mounts. Thank you again
 
Morning chaps, just a quick one, van is 3 years old now and never had light come on before until two months ago. Was driving the van and it was doing a regen at time for a very long time of about 40 miles? Then the dpf light came on But cleared within only a couple of miles and regen finished. The same thing happened last night?
Is this anything do worry about?
Apart from those two times it does the normal two regens for about 20 miles per tank
I’m glad the light went off so quickly but confused why it came on whilst driving for so long in regen mode and also they normally say to drive it up motorway for 20 mins but mine went back off in minutes?
I had a pendle remap put on in September which is ace but not sure if this could be a contributing factor as had this only happen since the remap

Any thoughts would be much appreciated :thumbsup:
 
What were the driving conditions before and during the time when the light was on ?

Pete
 
Quite a steady run on a fast A road
When the light came on was nearly home on a back road. Got caught at lights. Reved it stationary to 4 revs unintentionally to that amount and it light went off with the regen also?
One thing did forget to mention it had an Mot done late afternoon and not sure where it was running idle might of had an effect?
Thanks Pete :thumbsup:
 
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