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Dieselgate - VW Group Emission Scandal Discussion around the VW Dieselgate Emissions scandal. Details and news updates can be viewed here: http://forums.tdiclub.com/showthread.php?goto=newpost&t=448336 This forum is a work in progress depending on requirements, usage, etc.

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Old November 8th, 2018, 19:55   #316
METZDUP
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Originally Posted by DieselMann99 View Post
Also, maybe I should know, this but I don't: what are the "regens" and "regenerations" everyone is referring to? Can someone explain this to me?

Thank you.
NON-EXPERT EXPLANATION: The Regens / Regeneration is related to the DPF (diesel particulate filter) which is designed to incinerate diesel emissions. If the car isn't driven enough, or long enough, the DPF may start to clog and need to "regenerate" by simply driving on the highway for about 30 miles—allowing the DPF to do it's job and basically clear the build up.

There will be a light indicator light in the dash that appears when the DPF needs to regenerate.
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Old November 8th, 2018, 20:11   #317
DieselMann99
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Originally Posted by METZDUP View Post
NON-EXPERT EXPLANATION: The Regens / Regeneration is related to the DPF (diesel particulate filter) which is designed to incinerate diesel emissions. If the car isn't driven enough, or long enough, the DPF may start to clog and need to "regenerate" by simply driving on the highway for about 30 miles—allowing the DPF to do it's job and basically clear the build up.

There will be a light indicator light in the dash that appears when the DPF needs to regenerate.
Thank you, Metz.

So when the DPF starts to clog, is engine performance diminished until you regen it?


Also, is the indicator light the CEL, or a specific light?
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Old November 9th, 2018, 08:27   #318
METZDUP
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Thank you, Metz.

So when the DPF starts to clog, is engine performance diminished until you regen it?


Also, is the indicator light the CEL, or a specific light?

Not a significant noticeable performance difference.

It's a specific DPF light.
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Old November 9th, 2018, 08:33   #319
kjclow
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When the DPF gets filled with diesel particulates to a specified limit, it will either do a passive regeneration at highway speeds and temps that you should barely notice. If that doesn't happen or your engine is not up to operating temperature, the computer will request an active regeneration and supply excess fuel (blow by) to the exhaust to burn the particulates into ash. Prior to the fix, the regens (either type) usually occurred about once a tank. Since the fix, it's been reported that the regens seem to be shorter in duration but happening more frequently, about every 100 miles.

What I typically notice is that the rpm at idle kicks up to about 1000 for a few minutes. Maybe as much as 10 if the car is not hot enough. You might detect a burning rubber or paint smell from the outside if you either shut it down during a regen or shortly after. The can may also shudder slightly.

If your dpf cel comes on, you have issues and need to get it checked.
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Last edited by kjclow; November 9th, 2018 at 08:36.
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Old November 9th, 2018, 13:05   #320
flargabarg
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With a short test drive I would remind you of two things. First, not all cars are identical. You could have been driving a "bad one". This is true even of brand new vehicles. Second, several of the systems on these cars are adaptive and so may act slightly differently if they have been driven by someone with very different driving habits. So you might want to drive a second one before you decide.
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