Hi All.

After a seal leak and a complete overhaul of my engine new dpf and dmf I have a new issue where I cannot get the DPF to drop below 18%. Well sometimes it does but it quickly rises again. To be honest the car is almost like it isn't on a regen when it is. It feels a bit lumpy when it's running and it's almost impossible to get the temp up to 700 degrees.

What does anyone reckon? Under fuelling? Under aspiration?

I reckon................NEW CAR TIME!

Any fault codes?

I reckon................NEW CAR TIME!

Time to switch to a petrol car.

None till the glow plug light lit up saying efficiency below threshold. But the regen is working ish. So weird. I'm getting smoke out the exhaust too when it regens. I'm thinking timing maybe

What colour is the smoke?

I plugged the car in again this morning after being annoyed yesterday and driving normally for 50 miles or so home on an emergency regen cycle in 40 mile an hour roadworks and country roads. It's down to 15.9% so getting there. It's just mega slow to regen obviously?

What colour is the smoke?

White or grey I think. It lingers so not condensation. Dpf is supposed to stop any particles isn't it? So somethings getting through

It only stops the soot - black smoke.

 

Un-burnt oil and fuel will still get through.

 

When my DPF was on it's way out I would often get a cloud of white smoke when I lifted off the accelerator mid-way through regen.

My DPF is 400 miles old!!!

What does the carbon mass show up as?

Sent from my Nexus 4 using Tapatalk

What does the carbon mass show up as?

Sent from my Nexus 4 using Tapatalk

 

o%

Edited 7 April, 201511 yr by whitep

That is a new DPF!

 

I don't know how many successful regens it takes to build up enough ash to register as 1%?

 

The DPF is only 400 miles old? Have you achieved a successful regen yet?

 

I'd say it's still early days and would be giving the DPF a little longer to settle in...

Is the reading correct?  Could it be not getting a proper reading for some reason with the change?  When I re-gen'd an Audi A3 which was at about 89% it was down to somewhere around 1.5% after only about 8 miles of forced regen driving, keeping revs higher than usual.

That is a new DPF!

 

I don't know how many successful regens it takes to build up enough ash to register as 1%?

 

The DPF is only 400 miles old? Have you achieved a successful regen yet?

 

I'd say it's still early days and would be giving the DPF a little longer to settle in...

 

I did wonder about settling in but I am running the car with the laptop plugged in telling it to do a forced regen every time I start the car. Its driving about on regen constantly, or more accuratley drives around ready for a regen constantly. I need to do this to turn limp mode off.

 

I may have misled you a bit with the reading it says:

 

Group 068: Particle Filter (Exhaust Gas II)

22.1 % Particle Filter Load Coefficient

0.5 Particle Filter Carbon Mass

0 % Carbon Mass Learned Value

 

The particle load actually drops when driving normally and the car isnt actually regenning, then when it does start a regen it increases. Also when im in 3rd or 4th gear and at about 2500revs that is when the white/grey smoke comes out the back. The car almost clicks and runs differently then the smoke starts. Its so strange.

Is the reading correct?  Could it be not getting a proper reading for some reason with the change?  When I re-gen'd an Audi A3 which was at about 89% it was down to somewhere around 1.5% after only about 8 miles of forced regen driving, keeping revs higher than usual.

 

I have done 250 miles on manual regen mode and particle load coefficient drops to around 17.5-22% but no lower.

Also when im in 3rd or 4th gear and at about 2500revs that is when the white/grey smoke comes out the back. The car almost clicks and runs differently then the smoke starts. Its so strange.

 

I can relate to this, after 50,000 miles I knew exactly when my PD170 vRS was attempting a regen and was currently in a regen.

 

The higher RPM, different clutch biting point, different exhaust note, lumpy idle and general jerkiness when driving. I too got the white smoke but never worked out what it was.

I can relate to this, after 50,000 miles I knew exactly when my PD170 vRS was attempting a regen and was currently in a regen.

 

The higher RPM, different clutch biting point, different exhaust note, lumpy idle and general jerkiness when driving. I too got the white smoke but never worked out what it was.

 

Its unburnt diesel I guess, but how/why and the Load Coefficient increases when this happens. so its like its not regenning properly. getting soooo ****ed off. It had been fine sine the pressure sensor was replaced last year.

Did you get a genuine Skoda DPF ? When mine was playing up I was told only buy genuine as the cheaper ones can be a ballache and not perform correctly. I've been lucky as mine has behaved since we last broached this subject !

dont know if its genuine to be honest. if its not gen I dont mind but if its not suitabl efor the car and I have paid for it its a different story. I changed the G450 again, but the G450 I took off wasnt the one I fitted last year.... So methinks the garage have tried different sensors already.

It sounds like it will be worth a trip over to the garage to ask a few questions.

Get rid of it completely .... Best thing you'll ever do!

Get rid of it completely .... Best thing you'll ever do!

The car or DPF

The DPF!!!

Then, do you not bother declaring it to your insurer, or do you tell them you've modified the car in a way that makes it illegal to use on the public road? Not to mention possible issues further down the line when tests change or the dealer checks for it when trading it in.