At round four of the championship, the San Marino Grand Prix at Imola, Toleman decided not to run their cars during Friday qualifying after to a dispute with tyre supplier Pirelli.
Na cuarta rolda do campionato, o Gran Premio de San Marino en Imola, Toleman decidiu non participar cos seus coches durante o venres na cualificación logo dunha disputa con provedor de pneumáticos Pirelli.