Under what condition will a vehicle fail the functional inspection if the ignition timing is adjustable and indicated as 8 degrees BTDC?

A vehicle will fail the functional inspection if the ignition timing deviates significantly from the specified factory setting. In this scenario, if the ignition timing is adjustable and indicated as 8 degrees BTDC, the acceptable tolerance is typically set at +/- 3 degrees. This means that the ignition timing should ideally be between 5 degrees BTDC and 11 degrees BTDC to be within the acceptable range. If the timing measurement goes beyond this range, the vehicle would be considered out of spec and fail the inspection.

The other conditions mentioned in the other choices do not align with the common criteria used to assess ignition timing during a functional inspection. For instance, while checking if the timing matches the label is important, it is the degree of deviation that directly impacts the pass/fail status rather than just whether it matches or not.