 When Renault left the sport in 1986, Ligier was left without a bona fide engine supplier.An abortive collaboration with Alfa Romeo (due to René Arnoux's harsh criticism on the Alfa Romeo engines) was followed by customer engine deals with Megatron (who provided them with rebadged BMW M12 engines), Judd and Cosworth and then works contracts with Lamborghini, Renault and Mugen-Honda.Between 1987 and 1991, the team struggled, failing to score points in 1988, 1990 and 1991, and at the 1988 San Marino Grand Prix neither René Arnoux nor Stefan Johansson qualified for the race, the first time in team history that neither car made the grid.