Ignition Checks: Notes
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.
Using a high output spark tester, check for spark at coil wire and at each spark plug wire. Check spark plug wire resistance on suspected wires. See SPECIFICATIONS article in this section for specifications on spark plug wire resistance.