2001 Jaguar XJR Engine knocking

2001 JAGUAR XJR
106,000 MILES • V8 • 2WD • AUTOMATIC
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RSMITH
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When you start the car in the morning, (or after sitting) when the car drops to idle, there is a very pronounced knocking noise that goes away (or is less) after warming up or driving. Seem to be worse when it's cold.
Now the check engine light has just come on with a restricted performance initially (then goes off) then after a few starts the check engine light goes off. This has happened 3 times.

Any ideas???
Oct 26, 2009 at 11:28 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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