 For 1986, the throttle-body fuel injection system (which turned out to have driveability issues) was replaced by a multi-port "Sequential-Fire" fuel-injection system with a redesigned air intake; the system was based on an OBD-1 compliant Ford EEC-IV computer.At the end of its production in 1991, the LTD Crown Victoria was produced with the 5.0 L V8.Although a (rare) option on the Mercury Grand Marquis, sales of the 5.8-liter V8 (with a Ford 7200 variable-venturi carburetor) was restricted to fleets, with most sold as part of the Ford police package.