On this V8 engine, timing chain problems are very common. Because the timing chain tensioners were made from plastic, they can fail prematurely and cause serious engine damage. A noticeable engine noise while idling or during a cold start can indicate a timing chain tensioner problem. The engine noise may also be accompanied by a rough or uneven engine idle. Improved components are available to remedy this problem.
Engine Noise While Idling or After Cold Start on Jaguar XKR
Average mileage: 58,000 (58,000–58,000)
1 model year affected: 2000
2 people reported this problem
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Timing tensioners have been O.K.however I keep the rpm's around 2500. Praying and keepimg my fingers crossed. I suppose the question is how did Jaguar get away with using plastic tensioners for 98-02 models. They should have issued replacement tensioners and participate in the cost. Most Jaguar owners would be happy with some kind of participation, oh well another corporate consumer rip off.