A man has been found guilty of punching the partner of Blues prop Charlie Faumuina in a road rage incident in 2014.

Robert Rata Moko was found guilty in the Manukau District Court today, on charges of male assaults female, reckless driving and intentional damage.

Judge John Bergseng rejected the defence's claim Moko had been justified in pursuing and hitting Rachelle Faumuina's car, then punching her in a citizen's arrest because Faumuina had earlier hit his daughter with her car.

He will be sentenced on June 23.

Moko was found not guilty on a charge of threatening behaviour.

He and daughter Aroha Kahui were also found not guilty on charges of intimidation, because independent witnesses did not hear the words the charges related to.