So before you visit a smog test San Diego only center follow these tips . First, make every effort to ensure your vehicle is running right. If you feel the vehicle is not running right, immediately take it to a auto repair shop and have them find … Remember passing the smog test means your car needs to burn fuel efficiently with as little or no smog emmissions a possible.Because when the car has not been propery warmed up, it will not have the proper combustion you need. …