Specifically what controls the NOx emissions? Everything passed except NOx emmisions while on the dyno.

Just wondering to get an idea on repair costs. (It was a smog only station they make us go to in CA now - they dont do repairs and hadnt a clue what it could be.....


Thanks,
Sonic

Make sure your catalytic converter is really hot when tested (drive around like you stole it for a bit) and replacing O2 sensors may help as well.

my friends dad pours methonol into his old 80's v12 jag before he gets it smogged. seems to work for him :D

Nitros Oxide emissions are reduced by reducing the peak flame temperature during cumbustion. This is accomplished with exhaust gas recirculation. You may have a blocked EGR tube or orifice. The Cat Conv reduces unburned hydrocarbon emissions.