During a smog check inspection, when must visible idle smoke checks be performed on a gasoline hybrid vehicle?

Visible idle smoke checks are performed during a smog check inspection to assess the level of exhaust emissions released by a vehicle when it is idling. In the context of gasoline hybrid vehicles, the correct timing for conducting these checks is crucial for accurate emissions evaluation.

Performing the visible idle smoke check after the emissions sampling is appropriate because it allows inspectors to first gather quantitative data using emissions sampling equipment and then observe the vehicle's visual emissions characteristics. This sequence ensures that any issues revealed during the emissions testing can be further analyzed in relation to visible emissions, providing a comprehensive view of the vehicle’s overall emissions performance.

This process also helps to differentiate between emissions produced during specific testing conditions and any potential additional emissions that may occur when the vehicle is idling, which could indicate problems in the combustion or exhaust system. Thus, the timing of the visible idle smoke check after emissions sampling aligns with best practices for a thorough and effective smog check inspection.