[s-cars] Failed Emissions - NOX Too High - Help please

[Mark E. Pollan]

Crap!!  Arrived at the Maryland emissions station overly confident - left
with my tail between my legs with high NOX reading.

 

Pulled codes over the weekend and none came up with none on the VAG.
Checked the fluctuation of O2 lambda value and all seemed well - meaning
fluctuated quickly in the Bentley defined range.  O2 sensor only has 20K
miles on it and is OE Bosch with OE connector.  Only issue I know of is my
ISV.  Soaked in brake cleaner overnight and then Carb cleaner for a few
hours.  My idle still drops so I do now know I need a new one.

 

April of '02 emissions show all gas readings WAY below state levels.  Car
has MTM 1+ from Anderson installed a few weeks after the April '02 test.

 

Any ideas on things to check greatly appreciated.  Would a bum ISV
potentially be the issue?

 

Regards,

 

Mark

95.5 S6