Curious about cold engine rattle at 2.5K

ccrunner2011

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2002 Protege5, Classic Red
So, curiosity kills.

Does anyone have a rattle at 2200-2900 or so RPM with engine cold under load? It's quiet up to 2000 rpm then, hear a rattle and then quiets at about 2900. After warming for 5 minutes the temp needle sits past 1/4 and it doesn't happen when hot. Purs like a kitten (even though these engines are loud little buggers)


If battery is disconnected and left for 15-20 minutes to reset the ecu, it is quiet.
 
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