HIGH ENOUGH TO OVERCOME THE COUNTERSPRING, THE INJECTORS BEGIN SPRAYING. K-JETRONIC WAS USED FOR MANY YEARS BETWEEN 1974 AND THE MID 1990S BY LAMBORGHINI , FERRARI , MERCEDES-BENZ , VOLKSWAGEN , FORD , PORSCHE , AUDI , SAAB , AND VOLVO . THERE WAS ALSO A VARIANT OF THE SYSTEM CALLED