The LC91 made its debut at the 1991 United States Grand Prix driven by Éric Bernard and Aguri Suzuki.

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.

At Monaco Bernard qualified 21st and Suzuki 19th, but the Japanese driver's engine failed and the Frenchman finished ninth.

The Japanese Grand Prix saw Bernard break his leg in the first practice session and thus not take any further part in the race.

The Australian Grand Prix saw Bertrand Gachot replace Bernard, but he and Suzuki failed to qualify.