Looking for help going nuts!

mtnbikcowboy

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2010 Mazdaspeed3 2.3 L3
Replaced blown engine (unknown why). After market stock 2.3 rebuilt. After just a few minutes of getting warm (1-3 minutes) low pitched clicking noise from top side. Either goes away or is drowned out upon rpm increase. So far replaced all injector seals and had injectors cleaned and checked. Get a 2004 error for flappers stuck closed. Controller/solenoid ordered for replacement. Flapper and rod move mechanically without fault. Any other suggestions?

A few vids here:

http://agilbert.vidmeup.com/view
 
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