Hi Burseth,
Here are minor things to check before smog test.
1. Gasoline - make sure to use premium gasoline.
2. Fuel cleaners/additives - The good news is fuel additives can indeed clean out the carbon buildup and other gunk in your engine and catalytic converter, thus lowering emissions when testing time rolls around.
3. Water and Temperature - Temperature is also a consideration. Your vehicle will do better on the smog test when the outside temperature is 60 degrees, as opposed to when it is 90 degrees. Doing the smog test first thing in the morning is usually your best bet. Besides, people are generally in a better mood then (more about that later). Do make sure your engine is fully warmed up before arriving at the test station. A good 20-minute drive is recommended. You also definitely want the catalytic converter at full operational temperature
4. Battery - Be sure your battery is fully charged before the test. When the battery is not fully charged, a weak ignition spark can occur. A weak ignition spark will result in poorer mileage and much higher smog pollutants.
5. Take That Car for a Major Freeway or Highway Drive - If your car is mostly used for short trips, that is not good. Over time, carbon and all sorts of other gunk have built up in your engine, on your spark plugs, in your crankcase, and in your catalytic converter. All of these will emit noxious chemicals and cause other problems during a smog test. This scenario has caused many a smog test failure.
Let me know if you have questions.
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