Olá, digo que, em teoria, uma vela de ignição de qualidade não deve ser calibrada, pois isso é calibrado da fábrica.
Apart the ignition spark plugs are calibrated only to verify that it has its correct factory calibration and that it agrees with the specifications of the vehicle service manual, since when it comes to making its installation, this insurance that the spark plugs are properly calibrated, the spark plugs do not require calibration, remember the excess of confidence is dangerous so I recommend that you always recommend that you always give you a view to its calibration. Sem tempo.