as the ltd crown victoria became a stand-alone model line for the 1983 model year, the 4.2 l v8 was discontinued altogether, leaving the 5.0 v8 the only engine available on all models (with a 5.8 carburetor v8 engine also available, but only on fleet-usage models, particularly police cars). 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.