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When starting cold engine there is a rattling metallic noise up to about 2500 rpm. The noise disappears above 2500 rpm and the engine is running smoothly. When the engine is warmed up, the noise changes character and is now present above 2600 rpm, but has disappeared below 2500 rpm.
Looking for resonance problems with loose items in engine room or exhaust systems, have not identified the root cause for the noise. Can anybody here help to identify the problem?
 
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