[s-cars] Failed Emissions Revisited - NOX Too High

[Mark Pollan]

Hi All:

 

You MAY recall my previous plea for help.

 

I did some additional testing with VAG and came up with a fault code and one
thing (O2S Adaptation) WAY out of spec.  I'd like to run 'em past you and
hopefully you can help point me in the proper direction - or at least
sequence of attack.

 

Fault Code 00561 - Mixture Adaptation

            15-00 Adaptation Limit (Add) Not Reached

 

 

Display Group 00:

 

Field     Specified Values            Actual

1          184-215                         211

2          20-26                            025

3          77-83                            079

4          121-135                         128

5          70-125                          096

6          123-137                         134

7          41-61                            047

8          123-133                         128

9          100-141                         048************

10         35-37                            036

 

********Bentley says to conduct road test if value too low.  I took this
reading last week after a 30 mile drive and did the same yesterday with the
same result.  

What kind of road test is Bentley referring to?

Bentley gives 4 probable causes of a value less than 100:

1.	Fuel system pressure too high - I don't have the tools for this
2.	G39 (O2 sensor) - display value fluctuated nicely within spec of
0.96 - 1.04.  Can I assume O2 sensor is OK?
3.	G7 (MAF) - I don't have tools for this
4.	Air leak between turbo and throttle body.  I have a set of Samcos I
have not yet installed.  Install 'em?  Where else should I look for a leak?

 

Well, I hope this give you enough info to assist me and I GREATLY appreciate
any insights you may be able to offer.

 

Best Regards,

 

Mark

 

P.S.  I am running an MTM 1+ from Anderson chip.  All else is stock on the
motor.