I smogged mine a day or two after doing the combustion chamber treatment..If your running 1/2 the can through the fuel system as recommended on the can, I would run it all the way to almost empty then refill with premium before the next test.


I changed my oil right before passing the test as well, not sure if that helped or not. But it may help, as old oil may have some impurities in it from the seafoam/fuel which could possibly cause an increase in emmissions if it burns off if it makes it way past the rings on the cyl walls...

Also. Did you conform your timing as good to go?