800 miles, and the fan's going crazy even when turned off for a couple of minutes, and the 'Stop Start' has stopped working.

 

Had this fan issue on the vRS last year, but was told not to worry as it was merely the engine bay getting hot due to the extreme temperature of the DPF whilst it was re-generating.

That lasted for a few days though, which I found a bit strange.

 

I wasan't really expecting it to be re-generating quite so soon though tbh, and it's not as though I'm pootling around town all day, everyday either.

 

Any thoughts?

Should i just sit back and enjoy the smell of hot metal as it wafts past the open door when I stop? 

 

No lights on the display panel btw, so it obviously isn't blocked.

http://www.natef.org/NATEF/media/NATEFMedia/VW%20Files/2-0-TDI-SSP.pdf

page 57 on explains dpf operation in detail. Looks like yours has reached the preset number of miles criteria and failed to complete its cycle so completely normal IMO.

http://www.natef.org/NATEF/media/NATEFMedia/VW%20Files/2-0-TDI-SSP.pdf

page 57 on explains dpf operation in detail. Looks like yours has reached the preset number of miles criteria and failed to complete its cycle so completely normal IMO.

Just read that, thanks, but it doesn't mention anything about a preset number of miles for this to kick in.

 

At this rate then, can I expect this to be happening every 3 weeks and/or 800 miles?

Yes I get this fairly often too.  I did wonder at first

Just read that, thanks, but it doesn't mention anything about a preset number of miles for this to kick in.

 

At this rate then, can I expect this to be happening every 3 weeks and/or 800 miles?

Yes - see page 65 'distance regeneration' in most cases you won't even be aware an active regen is taking place. It's only when it's part way through and you switch the engine off that you'll know unless you spot the increased tickover 1000-1200 rpm, but by then its too late but it'll attempt another 1 soon after and as long as you don't get repeat fails you'll be fine.

I now have learnt something about the revs being a bit higher at times.

So. It attempts a re-gen every 750-1000 km's then ey?

 

Wonder just how long it actually takes to perform this clearance then?

Do I take it for a blast to get it over and done with in  1 go, and if so, how far, as it's had 2 attempts so far.

 

How many goes before it says "enough", and the light comes on on the dash? 

I've had the regen on a PDi before now..lol

 

Its also a myth that a 'blast' will sort it. The regen cycle actually works best at a steady throttle around 2,200rpm.

Got a couple of short runs to do today to customers premises.

 

 

A 2 miler from cold, and then another 8 miles.

Getting a bit paranoid that this isn't enough now, per the well documented discussions about not using a diesel with a dpf adequately and appropriately.

Why don't we see this ash being burnt off in the form of some sort of smoke btw?

Where's it all going?  :S

The ash is held inside the DPF for life.

 

The level of ash is what determines the life of the filter. Once the level of ash begins to increase it starts to cover the filter, this in turn means the filter needs to regen more often and has to work harder to complete a regen too.

 

This is why Volvo advise a DPF replacement at 100,000 miles on some models - at £1,200 (dealer rates).

 

The key to the DPF is to forget about it. The more you worry about it the more you find yourself changing your driving patterns in an effort to help it. The reality is it can help itself.

 

Just drive normally and if the light comes on then follow the advice in the manual.

 

There is every chance you'll never see it.

Seems to have cleared itself this morning, as the S&S has recommenced and the fan has gone back to sleep.

My FL CR170 seems to regenerate every 330-360 miles, my previous CR170 was the same - Both CFGB engines.

 

That's a mix of 25% London traffic and 75% fast motorway driving with tools and associated crap in the boot all the time. 

 

It takes about 10 minutes to complete on the motorway. 

 

My last car did well over 100k with no DPF problems whatsoever. VCDS can tell you the calculated ash content of your DPF. 

 

As previously mentioned, forget it is even there. It does its job with no intervention whatsoever. The only exception to this rule is constant start stop motoring day in, day out and frequent short journeys. These two conditions WILL require a longer drive to allow the DPF regen to initiate - no thrashing required.

 

That's one reason why SWMBO's vRS is a petrol. She does short journeys on the school run every day. 

 

The DPF needs the engine to be up to operating temperature before it will even think about a regen cycle. 

 

Also, you may (very occasionally) see a white puff of what looks like smoke if you cane it off a set of lights whilst the filter is regenerating, don't worry about it. That's just the soot being incinerated.

Fuel consumption was a very poor 53 (by comparison)  today.

 

At least I know when it's re-gening, as the S/S doesn't operate

Edited 29 May, 201412 yr by Mr Ree

S/s?

S/s?

Sorry. Stop/Start