Fiorio began his World Rally Championship career in 1986, competing for the Jolly Club team in five WRC events in a Fiat Uno Turbo. He retired in his first four rallies and then finished seventh at his home event, the Rallye Sanremo. The stewards controversially disqualified the French Peugeot team and handed victory to Lancia, but the FIA later annulled the results of the whole event, meaning Fiorio lost his first potential championship points. In the 1987 season, Fiorio continued with Jolly Club, competing in a Group N Lancia Delta HF 4WD in six events. He took three wins in the production car class and won the inaugural FIA Group N Cup (now the Production World Rally Championship). At the Rallye Sanremo, he competed with a Group A Delta HF 4WD and finished seventh overall, scoring his first WRC points.
In 1988, Fiorio drove a Delta Integrale in the WRC. He finished second at the Monte Carlo Rally, the Rally Portugal, the Olympus Rally, and the Rallye Sanremo, and took third place at the Acropolis Rally in Greece. These results placed him third in the drivers' world championship, behind Lancia factory team drivers Miki Biasion and Markku Alén.
Fiorio's 1989 season began with a serious accident at the Monte Carlo Rally. He lost control of his Delta Integrale on the fifth stage and crashed into the crowd at approximately 145 km/h (90 mph), killing two spectators and injuring three others. Fiorio and his co-driver Luigi Pirollo were unhurt. He went on to finish second in Argentina and Sanremo, third in Portugal and Greece, and fourth at the Rally Australia. With 65 points, he placed second in the drivers' championship, behind Biasion and ahead of Toyota's Juha Kankkunen. In 1990, Fiorio achieved his last podium finish with a Lancia factory team Delta Integrale 16V in Australia. With three other points-scoring finishes, he placed ninth in the drivers' championship.
In 1991, Fiorio drove a Ford Sierra RS Cosworth 4x4 in four events, with a ninth-place finish in Sanremo as his best result. The 1992 season saw him return to the wheel of a Delta Integrale with the Astra Racing team. He finished fourth at the Rally Argentina and the Rally Catalunya, fifth at the Rallye Sanremo, and seventh at the Acropolis Rally. Fiorio continued with Astra in the 1993 season, competing in four selected events, with his best result being fifth in Catalunya. In 1994, Fiorio competed in only two WRC events, retiring with a Ford Escort RS Cosworth in Portugal and taking fourth place with a Delta HF Integrale at the Acropolis Rally. In the European Rally Championship (ERC), he won the Cyprus Rally for the third consecutive year. In his only world rally in 1995, he took his Escort RS Cosworth to eighth place in Portugal.
After a comeback to the WRC by competing at his home event in 2000 and 2001, Fiorio undertook a full Production World Rally Championship program for the Ralliart Italia team in 2002. He took his Mitsubishi Lancer Evolution 7 to production car class victory at the Rally Finland and finished fifth in the PWRC drivers' championship. After retiring from the WRC, Fiorio has competed in the ERC and the Italian Rally Championship.
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