help my 8.1 engine will not pass emissions test in canada

I would get 5 cans of seafoam and pour four in the gas tank. I would disconnect a suction line and let it suck the can fifth can of seafaom out and shot off the engine. Let the engine set for 30 minutes. When you start it back up it is going to smoke excessively. After drive it around for a few miles and it will clear up. I did this with my f53. I also use seafoam in my diesel pusher and all my gas equiptment.