First let's learn about smog.

The first test the smog check center will administer as part of the entire smog inspection process is the emissions test. In order to pass the emissions test portion of the smog inspection your car's engine must be burning fuel efficiently, insuring hydrocarbons in it's combustion chambers are thoroughly spent.

Hydrocarbon put simply, is gasoline. The more gasoline your vehicle's engine combusts completely, the less pollutants are emitted into our air.

The emissions test will measure your vehicle's HC, CO and NOx production, and insure they are within the limits set by the State of California. Your vehicle's CO2 and O2 emissions are measured as well, however these results do not effect passing or failing the emission test.

Optimum fuel combustion is achieved when the engine can maintain a 14.7:1 air/fuel ratio during the combustion process with a constant variation +/- 5% to assist the catalytic converter operation. 14.7:1 air/fuel ratio insures your car is not burning or wasting fuel. If you notice your car is using up or burning too much gas, more then likey your vehicle is not running properly.

*Tip*

- Performing routine tune ups, which should include changing the spark plugs, air filter, fuel filter, and engine oil,  prior to a smog check inspection or as required by the vehicle's manufacturers will greatly improve your chances of passing the emissions test.

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