Emission Control

jcrews

Top Post Dawg
Joined
Jul 28, 2007
Location
Round Rock, TX - VCDS
TDI
All gone
Both have EGR, 3 way catalyst, and closed CCV.

mkv additionally has an oxygen sensor.

mkv + CR (2009-2010) has DPF, CAT, EGR, NOx, additionally
 

crankme69

Veteran Member
Joined
May 16, 2011
Location
Ill.
TDI
1996 Passat
Careful any subject pertaining to emissions or saving trees is not allowed here...friggin tree huggers!
 

GoFaster

Moderator at Large
Joined
Jun 16, 1999
Location
Brampton, Ontario, Canada
TDI
2006 Jetta TDI
Only if you attempt to remove or circumvent does the discussion potentially cross the line.

Back to the original question, it goes more by model year than by vehicle generation, and the following discussion applies to North American market only.

Through 2006, all TDI engines had crankcase ventilation and EGR systems, and an oxidizing catalyst. Around 1998, the EGR became "cooled EGR" with a heat exchanger transferring the exhaust heat into the coolant before blending with the intake air.

The "pumpe-duse" engines (which started in 2004 - installed in both Mk4 and Mk5) added a lambda sensor in the exhaust for fine-tuning the operation of the EGR system. The 2006 model adds a changeover valve for the EGR cooler so that it can operate either in cooled-EGR mode or uncooled-EGR to help with warm-up.

In the North American market, there was no 2007 or 2008 model year TDI.

The common-rail "clean diesel" engine 2009 and onward has the following main emission control systems, which have thoroughly been discussed elsewhere in these forums.
- High pressure EGR
- Low pressure EGR
- Oxidizing catalyst
- DPF (diesel particulate filter)
- Lean NOx catalyst without requiring AdBlue (Golf/Jetta/New Beetle) or SCR NOx catalyst requiring the use of AdBlue (Passat and all larger models)
- H2S catalyst

All of this is on top of the ECU calibration and the choice of injectors and fuel delivery methods. The 2009 models are very complex.

We already know that the upcoming EA288 TDI engine (due in Mk7 Golf) incorporates these systems into the design and simplifies them by eliminating some hardware, as opposed to the "added-on" arrangement that forces quite a number of compromises.
 

Roshermoore

Veteran Member
Joined
Jan 5, 2009
Location
East Texas
TDI
2009 JSW DSG sunroof
Smoke not needed!

I love the smoke from a diesel, and want to find out how to get smoke from the stock engine.
FWW We need to be showing the public that diesels are no longer smoky, noisy, smelly engines. We should be trying to convince them that the new generation of engines no longer do any of these things.
 

crankme69

Veteran Member
Joined
May 16, 2011
Location
Ill.
TDI
1996 Passat
Mine smokes when the go pedal is too the floor not alot but some. Ya mean it ain't supposed to...? :p
 

JSWTDI09

Top Post Dawg
Joined
Jan 31, 2009
Location
Las Vegas, Nevada
TDI
2009 JSW TDI (gone but not forgotten)
Mine smokes when the go pedal is too the floor not alot but some. Ya mean it ain't supposed to...? :p
Many older diesels smoke a bit. However, one of the main reasons we drive TDIs is for the economy. Smoke = wasted fuel. You get smoke when your fuel/air ratio is too heavy on fuel (not enough air for the amount of fuel injected). A well running diesel will produce very little smoke. If your car puts out much smoke; you either need less fuel or, even better, more boost (maybe a bigger turbo:D).

Have Fun!

Don
 

PDJetta

Top Post Dawg
Joined
Nov 6, 2003
Location
Northern Virginia
TDI
'04 Jetta GLS TDI Pumpe Duce Platinum Grey w/ Leather
Both have EGR, 3 way catalyst, and closed CCV.

mkv additionally has an oxygen sensor.

mkv + CR (2009-2010) has DPF, CAT, EGR, NOx, additionally
The A4 with the BEW has an O2 senser too (2004 on).

--Nate
 
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