I read DougH's recent threads with passing concern until I failed my inspection yesterday for high NOx. I have now read and reread everything. And this is the course of action that I going to take.

Optmize cooling system by:
1. New radiator
2. Install missing fan shourd
3. Run straight water for the test, add antifreeze later

Optmize fuel delivery system by:
1. Run a can of BG 44K throught before test
2. New fuel filter
3. Premimum gas with a octane booster
4. Reconnect bypass butterflies for the test

And a new catalytic converter

All this needs to done to the Montero anyway, but it stinks to have to it for the state. I am also thinking about O2 sensor, temperture sensor, and going to a shop for the timing if I don't pass this time. Is there anything that I might be missing? <img src="/forums/images/graemlins/confused.gif" alt="" />