The LC91 made its debut at the 1991 United States Grand Prix driven by Éric Bernard and Aguri Suzuki. Bernard qualified 19th and Suzuki 21st. In the race, Bernard's engine blew and Suzuki finished 6th. At the Brazilian Grand Prix Bernard qualified 11th and Suzuki 17th, but the Japanese driver did not start the race due to fuel pump failure and the Frenchman retired with a broken radiator. The San Marino Grand Prix saw Bernard qualify 17th and Suzuki 20th. However, Suzuki spun off in the wet conditions and retired and the Frenchman retired when his engine blew. At Monaco Bernard qualified 21st and Suzuki 19th, but the Japanese driver's engine failed and the Frenchman finished ninth. The Canadian Grand Prix saw Bernard qualify 19th and Suzuki 22nd, but Suzuki retired when a fuel leak caused a fire and Bernard retired with a broken gearbox.