Ignition Timing
WARNING: This page is about a different car, the 1990 Jaguar XJ-S, 1989 Jaguar XJ-S, 1988 Jaguar XJ-SC, and 1988 Jaguar XJ-S. However, it is still accessible from the selected car via links, so may be relevant.
Ignition timing is electronically controlled by the ECU. No adjustment is necessary.