Dismal DPF!

Yep this particular model seems to cop the worst DPF problems. Things to help are to use good fuel from the top three brands, avoid short runs, use Morleys smoke killer, and install a Provent if you can squeeze it in somewhere! If any of you guys are in Brisbane, I want to have a good look at one of these once Carformance is set up properly around July. Like to work on fitting a catch can, and do some testing on the DPF setup. They sure seem to suffer more that they should.

My gut feel is the DPF is either too small, or too far removed and not getting hot enough passively.

Oh and those differential pressure valves are dodgy at best.....They do need to be calibrated once fitted in Vag Com chaps under advanced coding.

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Originally Posted by Transporter

The best way to check the fuel consumption is from the fuel docket. ;)

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Valid point sir! :P

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Originally Posted by kaanage

That can't be right! Your TDi's are using over DOUBLE what the older 1.9 PD TDi 9N3 Polo uses.
Something is seriously faulty with those CR 1.6 TDi engines (in your cases, at least).

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Our 1.9 PD TDI Polo has average fuel consumption (mostly short trip school run) after 39,500km of 7.1L/100km zig-zagging from about 6 to 8.5 with general trend downwards. The computer always seems to report better than this - it lies.

The old DPF light came on again over the weekend. I seem to be getting used to seeing it. So i took the car for a nice long trip to give the DPF a clean out as usual. The light disappeared after 10mins of driving at 80+ kms, so i proceeded to travel home. This got me thinking about my driving habits over the past few weeks. My driving over the last few weeks is as follows:

• 2 weeks ago = DPF light comes on. Take the car for a long trip to burn the ash off.

• 3 days later = DPF light comes on again. So i take the POLO for another long trip. DPF light disappears.

• 5 days of 15-20 minute trips to work. Inner city driving.

• 2 days of highway driving. Few hours long, per trip.

• 5 days of 15-20 minute trips to work. Inner city driving again.

• Weekend just gone = DPF light has come back on!

Surely i have done enough driving (80+ kph) to justify the DPF regen over the course of a few weeks?

With only 7,499kms on the clock, this is getting ridiculous! I plan on going to the Dealership this afternoon and start asking some GOD DAMN QUESTIONS! :facepalm:

When doing the 80km/h+ runs, are you also driving at 3000rpm+ to help the soot burn out (the ash stays as the residue :()

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Originally Posted by kaanage

When doing the 80km/h+ runs, are you also driving at 3000rpm+ to help the soot burn out (the ash stays as the residue :()

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The manual suggests driving in 4th gear above 80km/h. As far as i can remember i was sitting around 2500rpm+?

Our dealer told us that if the DPF was clogged and we brought it in, they'd basically drive it at about 4000rpm on the freeway for about 1/2 an hour :confused:

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Originally Posted by kaanage

Our dealer told us that if the DPF was clogged and we brought it in, they'd basically drive it at about 4000rpm on the freeway for about 1/2 an hour :confused:

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I have considered dropping back to 3rd gear on the highway, to get the RPM right up. But don't think i could handle hearing my new diesel moan for an hour :(

good old italian tunes keep diesels alive sometimes .. I have replaced the rear end of my exhaust .. and the note is noticeably different after i have "cleaned out" the dpf lol