Fuel Pressure Release (XJS)
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1990 Jaguar XJ6, 1990 Jaguar XJ-S, 1989 Jaguar XJ6, 1989 Jaguar XJ-S, and 1988 Jaguar XJ6. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect wire from inertia switch. Inertia switch is located on passenger's side footwell on the front door pillar. Start engine and let idle until engine stalls. Crank engine an additional 5 seconds.