Failed OBD1 emissions - emission gurus

[Smokin_Joes_2kSi]

if it's a honda, *COUGH* chip ecu, crome pro, lean it out...TADAH!!!
emissions done!
Joe

[SLow_POke]

if it's a honda, *COUGH* chip ecu, crome pro, lean it out...TADAH!!!
emissions done!
Joe

And if you dont know what your talking about, dont post, anybody can say "put a new cat and 02 sensor on it"


Car : bone stock 1993 300z

It failed the NOx ppm reading.... What can be the cause of that.


the reading was 2321 and the limit is 907

It passed the HC-ppm and CO% with flying colors.

I want to know what this means..

TADA!!!!!!!!!!!!!!!!!!