Can a licensed smog technician at a test only station make minor adjustments to ignition timing?

In a test-only station, licensed smog technicians are specifically restricted from making adjustments to a vehicle's emissions systems or settings, including ignition timing. The purpose of a test-only station is to ensure an impartial and unbiased assessment of a vehicle's emissions compliance. By not allowing technicians to make changes like timing adjustments, it helps to maintain the integrity of the testing process, ensuring that the results are solely reflective of the vehicle's condition as it stands without manipulation. Since the role is strictly to test and not modify, allowing any adjustments could compromise the fairness of the smog check.