Maybe as the title says being paranoid but just got back in my new blackline Vrs TDI after a 10 mile drive steady 60mph most of the way keeping the revs low during the run in period. Parked on the drive turned off the engine and the fans were going really loud. I thought this odd seeing as the temp outside was 3° and the engine temp was only 90° (needle in centre). I thought it must be a new turbo timer feature thats not on my Petrol Turbo VRS. Anyway I get the kids out of the car and put them both in bed. But i can still hear the fans from inside the house in the back bedroom with the doors closed. Now if i had to guess i would say the fans were between 80 - 100db They were running continuously at full for at least 10 minutes after turning off the engine, loud enough to get the neighbours up ar the windows looking through the curtains. Probably louder than the engine. I could also smell burning but then there are fireworks going off so couldnt determin if the smell was coming from the engine bay or not. I Have had my 2.0 FSI petrol turbo and can't remember every having the fans come on this loud or for this long even in the summer.

Any ideas am i being paranoid no warning lights on the dash or error codes on the VAGCOM im guessing faulty temp sensor but could just be me overly worrying.

Any imput apreciated.

Maybe as the title says being paranoid but just got back in my new blackline Vrs TDI after a 10 mile drive steady 60mph most of the way keeping the revs low during the run in period. Parked on the drive turned off the engine and the fans were going really loud. I thought this odd seeing as the temp outside was 3° and the engine temp was only 90° (needle in centre). I thought it must be a new turbo timer feature thats not on my Petrol Turbo VRS. Anyway I get the kids out of the car and put them both in bed. But i can still hear the fans from inside the house in the back bedroom with the doors closed. Now if i had to guess i would say the fans were between 80 - 100db They were running continuously at full for at least 10 minutes after turning off the engine, loud enough to get the neighbours up ar the windows looking through the curtains. Probably louder than the engine. I could also smell burning but then there are fireworks going off so couldnt determin if the smell was coming from the engine bay or not. I Have had my 2.0 FSI petrol turbo and can't remember every having the fans come on this loud or for this long even in the summer.

Any ideas am i being paranoid no warning lights on the dash or error codes on the VAGCOM im guessing faulty temp sensor but could just be me overly worrying.

Any imput apreciated.

Hi,

Have a read at this thread.

http://www.briskoda.net/forums/topic/163575-cooling-fans-stay-on-after-turning-ignition-off/

I hope this help.

No worries it is a DPF Regen thing comming on. I kept getting paranoid few times it happened but after a thorough research, i got reassured that it is perfectly normal. Burnt smell usually comes from back area of the car - where soot gets burned off, and comes out of tailpipe. To put it in simple words ( how I understand it - though might be wrong ) what happens is VW has DPF regen set to become active at every 600 miles driven ( i think ) and what happens is when you actually shut engine off during the regen ( no way of telling from drivers seat wheter it is actually happening ) fans come on to cool the whole system off, since around 600*C or 800*C is needed for the whole system to actually work ( burning the soot off ). Petrol vehicles dont do it because there is no DPF.

Enjoy the car. And give it good boot from time to time. If want to be reasured research DPF REGEN.

Hope it helps.

More info on here. And dont worry.

http://uk-mkivs.net/forums/t/343695.aspx

Ah ok feel a bit more reasured now but im not sure about the dpf regen thing. If its a 600 miles cylcle then we only done 100miles so far so seams to have kicked in early. I ready in the handbook that the dpf can get clogged on short runs because the exhaust doesn't get upto temp and the soot doesnt get burnt

off but not sure this is the case. engine was at 90° most of the way. 10-15 miles should be enough for exhaust to get to temperature i would guess. nearly all dual cariiage way @ 60-70mph getting about 44mpg. Just seamed very loud and for a sustained period hope it doesnt happen all the time.

I' ve owned the car for 6 months and it happened to me twice so far. But like i'm saying dont' think about it too much. Make sure you take her out for a longer drive every few weeks and give it a blast.

Ah ok feel a bit more reasured now but im not sure about the dpf regen thing. If its a 600 miles cylcle then we only done 100miles so far so seams to have kicked in early. I ready in the handbook that the dpf can get clogged on short runs because the exhaust doesn't get upto temp and the soot doesnt get burnt

off but not sure this is the case. engine was at 90° most of the way. 10-15 miles should be enough for exhaust to get to temperature i would guess. nearly all dual cariiage way @ 60-70mph getting about 44mpg. Just seamed very loud and for a sustained period hope it doesnt happen all the time.

I has nothing to do with exhaust temp. I think the way it works is there is a seperate valve on the actual engine that opens and lets hot fumes go through the filter. But thats getting into details. Bottom line is everything is fine.

Ah ok feel a bit more reasured now but im not sure about the dpf regen thing. If its a 600 miles cylcle then we only done 100miles so far so seams to have kicked in early. I ready in the handbook that the dpf can get clogged on short runs because the exhaust doesn't get upto temp and the soot doesnt get burnt

off but not sure this is the case. engine was at 90° most of the way. 10-15 miles should be enough for exhaust to get to temperature i would guess. nearly all dual cariiage way @ 60-70mph getting about 44mpg. Just seamed very loud and for a sustained period hope it doesnt happen all the time.

Sorry for multiquote

Oh and another thing. DPF filter problems were common in "older generation" PD engines, which werent made to work with DPF.

As above this is simply the DPF (Diesel Particulate Filter) cooling down after an interupted regeneration.

The DPF burns off the soot held in the filter by increasing the temperature through the injection of additional fuel. A catalyst attached to the DPF allows this additional heat to be kept close to the DPF to aid the regeneration.

If the regeneration is interupted (speed/RPM reduced or the engine is turned off) then this excess heat needs to be cooled.

This is why the engine fans were running at their top speed for as long as they did. The burning smell is normal.

The regeneration will continue next time the requirements are met.

Ok thanks for reply's.

I dont get a DPF i know how it works but...

If it burns off the soot.... why bother with a DPF lol, surely the burning of the soot will produce something?

Ah ok feel a bit more reasured now but im not sure about the dpf regen thing. If its a 600 miles cylcle then we only done 100miles so far so seams to have kicked in early. I ready in the handbook that the dpf can get clogged on short runs because the exhaust doesn't get upto temp and the soot doesnt get burnt

off but not sure this is the case. engine was at 90° most of the way. 10-15 miles should be enough for exhaust to get to temperature i would guess. nearly all dual cariiage way @ 60-70mph getting about 44mpg. Just seamed very loud and for a sustained period hope it doesnt happen all the time.

I'm sure that it has been sat idling both at the factory, the dealers and with you (playing with the settings). I know when I have left the works motors idling for a couple of hours the stuff they kick out when you drive off would lead you to think the engine had blown!. Hence the early regen.

Edited 6 November, 201213 yr by Metblackrat

I dont get a DPF i know how it works but...

If it burns off the soot.... why bother with a DPF lol, surely the burning of the soot will produce something?

A DPF filters out the carbon soot particles from the exhaust gas. These soot particles are converted into carbon dioxide by a reaction with nitrogen oxide from the exhaust gasses. In addition to the nitrogen oxide a small amount of ash is produced which is forever stored within the DPF. It is this level of ash that determines the life of the DPF as it cannot be removed. The more ash stored within the DPF the less efficient it is at burning off the soot so as the DPF ages the quicker it will deteriorate.

In its function as oxidisation catalyst the DPF also cleans the exhaust gas of hydrocarbons (HC) and carbon monoxide (CO). They are converted into water (H2O) and carbon dioxide (CO2) which pass through the exhaust system and are emitted from the exhaust via the tail pipes.

So essentially what comes out is potentially less harmful than what goes in!

thats amazing. after 76,000 miles I never knew that.

I have had it a couple of times (one last weekend) where this has happened, and I was a bit worried.

The noise is horrific, and it does go on for ages (I always think I will come out with a flat battery)

At least i now know for next time.