Originally posted by slewman
Thom, If your fuel mixture is set properly and the vehicle is in good service ? Replace your catalytic converter, those magic pass smog juice only work marginally. Don't install hotter plugs , Mercedes has the compression,timing,temperature, and many other factors designed to work with the stock plug. Dyno testing is easier to pass only if the vehicle is dirty at idle. It is harder to pass because they measure NOX. S.
Thanks slew. I intend to replace the O2 sensor for the long term as that would probably dial in the air-fuel mixture. As I'm very close I want a quick short term fix to get me past the test. I'm just hoping that keeping the catalytic converter hot before the test will do the trick.