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TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

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Old March 15th, 2013, 17:52   #1
sareljr
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Default Emission Control

Does the mkiv or mkv Jetta TDI have any emissions controller like an EGR Valve, or DPF?
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Old March 15th, 2013, 17:53   #2
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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
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Old March 16th, 2013, 18:17   #3
sareljr
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What is a CCV? Is the EGR prone to clogging and failing or is it necessary?
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Old March 16th, 2013, 19:18   #4
Cory F
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Quote:
Originally Posted by sareljr View Post
What is a CCV? Is the EGR prone to clogging and failing or is it necessary?
Crank Case Vent

Yes, EGR will cause clogging in many cases.
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Old March 17th, 2013, 07:56   #5
sareljr
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Is there an EGR delete then? I know on the diesel trucks you get DPF and EGR deletes.
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Old March 17th, 2013, 08:12   #6
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Careful any subject pertaining to emissions or saving trees is not allowed here...friggin tree huggers!
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Old March 17th, 2013, 08:28   #7
GoFaster
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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.
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Old March 17th, 2013, 09:01   #8
sareljr
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Originally Posted by crankme69 View Post
Careful any subject pertaining to emissions or saving trees is not allowed here...friggin tree huggers!
No worries, I love the smoke from a diesel, and want to find out how to get smoke from the stock engine.
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Old March 17th, 2013, 09:36   #9
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Default Smoke not needed!

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Originally Posted by sareljr View Post
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.
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Old March 17th, 2013, 11:02   #10
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If you want smoke, you're barking up the wrong tree. It ain't a friggin' Cummins.
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Old March 17th, 2013, 11:18   #11
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Mine smokes when the go pedal is too the floor not alot but some. Ya mean it ain't supposed to...?
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Old March 17th, 2013, 11:35   #12
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Quote:
Originally Posted by crankme69 View Post
Mine smokes when the go pedal is too the floor not alot but some. Ya mean it ain't supposed to...?
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).

Have Fun!

Don
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Old March 17th, 2013, 13:50   #13
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Quote:
Originally Posted by jcrews View Post
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).

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Old March 17th, 2013, 16:28   #14
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Quote:
Originally Posted by sareljr View Post
No worries, I love the smoke from a diesel, and want to find out how to get smoke from the stock engine.
We do not want to promote this sort of environmental irresponsibility here.
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Old March 17th, 2013, 16:36   #15
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Quote:
Originally Posted by sareljr View Post
No worries, I love the smoke from a diesel, and want to find out how to get smoke from the stock engine.
Set it on fire. The smoke you get is amazing.

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