Reply
 
Thread Tools Display Modes
  #31  
Old 12-09-08, 19:43
Oscarli Oscarli is offline
Van Jedi
 
Join Date: Oct 2007
Location: Leamington Spa
Posts: 275
Default Re: DPF Filter

the 2008 Audi's now have the dpf after the cat, the idea being that once the cat is up to temp it will keep the dpf hotter too. Diesels (especially VAG versions) run very cool and due to the peak torque being very low in the revs you find most drivers never get them hot enough to suit the dpf regen criteria. Only time will tell if moving the dpf backwards will help with all the current issues.

The VAG 2.0tdi 170ps ppd cars are undergoing many ecu software updates to cure all sorts of dpf related issues but luckily its not so severe on the VW van range.

My own personal experience with a 130 T5 with dpf is good, no problems in 27k but I do vary the driving style and distances quite a lot. If you are a courier or trader with only local work then best buy an older van without dpf. I know that UPS, TNT, etc with big fleets of MB and VW vans (sprinters and Crafters) have complained a lot about the amount of time vehicles are off the road because of dpf issues.

I know a lot of exhaust manufacturers are also talking about bypass pipes but its not that simple, there are pressure sensors and the ecu software looking for the dpf to be working properly, a bypass pipe will leave you with an engine check light on and possibly limited power (limp mode)
Reply With Quote Quick reply to this message
  #32  
Old 12-09-08, 19:45
Oscarli Oscarli is offline
Van Jedi
 
Join Date: Oct 2007
Location: Leamington Spa
Posts: 275
Default Re: DPF Filter

if the petrol equivelant is a cat then maybe we should call the dpf a dog ; )
Reply With Quote Quick reply to this message
  #33  
Old 12-09-08, 20:02
dryroasted dryroasted is offline
Van Expert
 
Join Date: Mar 2008
Location: Devon
Posts: 33
Default Re: DPF Filter

Mine has been into VW today, had a years worth of updates applied, and ecu put back to factory standard so at least I have a starting point to get this sorted.

As I pulled out of the garage, regen again! Not as bad as with map, but still there. Took the mechanic out, but it wasn't too bad apart from the odd jerk and lack of power etc. I will keep an eye on it over the next couple of thousand miles and see how it performs.

I still have a feeling that something is not right, but it's just getting to the bottom of it that's the problem.

I can only preseme it is a regen and not some other intermitent fault...
Reply With Quote Quick reply to this message
  #34  
Old 16-09-08, 19:53
Oscarli Oscarli is offline
Van Jedi
 
Join Date: Oct 2007
Location: Leamington Spa
Posts: 275
Default Re: DPF Filter

Could be as simple as an exhaust pressure sensor failure or the egt sensor maybe, not exactly uncommon problems on the 2.5's
Reply With Quote Quick reply to this message
  #35  
Old 16-09-08, 21:29
oddboy oddboy is offline
Lord of the T4s
I Support Cancer Research UKI Support Children In Need
 
Join Date: Apr 2008
Location: uk
Posts: 1,374
Default Re: DPF Filter

Quote:
Originally Posted by Oscarli View Post
Could be as simple as an exhaust pressure sensor failure or the egt sensor maybe, not exactly uncommon problems on the 2.5's
had one of them within a week of getting the van replaced under warrenty

vw gtd 2012 not a van but still a vw
Reply With Quote Quick reply to this message
  #36  
Old 16-09-08, 21:44
dryroasted dryroasted is offline
Van Expert
 
Join Date: Mar 2008
Location: Devon
Posts: 33
Default Re: DPF Filter

Wouldn't this throw a fault code though?

I've booked it in again for next week so VW can work their magic on it...maybe...
Reply With Quote Quick reply to this message
  #37  
Old 17-09-08, 22:03
Oscarli Oscarli is offline
Van Jedi
 
Join Date: Oct 2007
Location: Leamington Spa
Posts: 275
Default Re: DPF Filter

egt sensor gives a check light but not always the case with the pressure sensors
Reply With Quote Quick reply to this message
  #38  
Old 02-10-08, 23:50
dryroasted dryroasted is offline
Van Expert
 
Join Date: Mar 2008
Location: Devon
Posts: 33
Default Re: DPF Filter

My van has been into VW again today for them to look at. Their attitude seems to be that if the computer says its ok then there's nothing they can do. It drives ok 90% of the time, its just when it has its moments. Because its "intermitent" they say I need to take it in when it's doing it. I can see their point, but it doesn't help me get it sorted.

I'm a bit stumped as where to go from here...any ideas?
Reply With Quote Quick reply to this message
  #39  
Old 02-04-09, 08:44
oddboy oddboy is offline
Lord of the T4s
I Support Cancer Research UKI Support Children In Need
 
Join Date: Apr 2008
Location: uk
Posts: 1,374
Default Re: DPF Filter

Quote:
Originally Posted by dryroasted View Post
My van has been into VW again today for them to look at. Their attitude seems to be that if the computer says its ok then there's nothing they can do. It drives ok 90% of the time, its just when it has its moments. Because its "intermitent" they say I need to take it in when it's doing it. I can see their point, but it doesn't help me get it sorted.

I'm a bit stumped as where to go from here...any ideas?
any update ? did you get it remapped again ?

vw gtd 2012 not a van but still a vw
Reply With Quote Quick reply to this message
  #40  
Old 02-04-09, 11:44
nwilko nwilko is offline
Lord of the T4s
Official MemberVW Transporter
 
Join Date: Sep 2008
Location: coventry
Posts: 1,416
Default Re: DPF Filter

When Regen is active your injection is very late, ie post combustion and unburnt fuel is being thrown down the exhaust. This burns late in the combustion chamber and continues burning in the exhaust/dpf to add the required heat to clear the DPF. If you simply remove the DPF and leave the ECU software standard IE Regen can still occur, you would be throwing a lot of heat into your exhaust which is not designed for this. Potentially this heat build up could warm your van more than you would like
If youre getting remapped and have a DPF fitted i would make sure that the remap does account for regen. If your remap simply adds more fuel volume throughout you could be putting too much fuel into the DPF when regen is active..
best of luck..
Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the VW T4 Forum - VW T5 Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Location
Where you live
First Name
Surname
Postcode
Postbit Orientation
Change the display of the avatars and members types.
Insurance
Please select your insurance company (Optional)
Body & Engine Type
Tell us about your van.
Date of Birth
Your date of birth and age are displayed in several places on the forum. Only the administrator will have access to your date of birth should you choose to hide it via the privacy option below.
Month Day Year
     
Privacy

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Merchandise Advert

All times are GMT. The time now is 00:59.