The upper bushings on the front shock absorbers are prone to failure and may produce a rattling/jingling noise as the car is driven over bumps.
1991 Jaguar XJS Problem Reports
Most Reported 1991 Jaguar XJS Problem Reports
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Although a high rate of engine-related fires have been reported with this engine, most can be attributed to neglected maintenance. The fuel hoses in the engine compartment should be inspected periodically.